X-Git-Url: https://git.donarmstrong.com/?p=deb_pkgs%2Fautorandr.git;a=blobdiff_plain;f=autorandr.py;h=9524f4274d8275ca32bb9b53c8d55673cd1a5684;hp=481d810e561f1510ea0ee9c6275eb079491a9d98;hb=1a48d584fe533555581f3f98818cd0ad9bd92334;hpb=a50ac263773294c16836189f55663ed7c861d5c0

diff --git a/autorandr.py b/autorandr.py
index 481d810..9524f42 100755
--- a/autorandr.py
+++ b/autorandr.py
@@ -23,24 +23,43 @@
 #
 
 from __future__ import print_function
-import copy
-import getopt
 
 import binascii
+import copy
+import fnmatch
+import getopt
 import hashlib
 import os
+import posix
+import pwd
 import re
 import subprocess
 import sys
-from distutils.version import LooseVersion as Version
+import shutil
+import time
 
+from collections import OrderedDict
+from distutils.version import LooseVersion as Version
 from functools import reduce
 from itertools import chain
-from collections import OrderedDict
+
+if sys.version_info.major == 2:
+    import ConfigParser as configparser
+else:
+    import configparser
+
+__version__ = "1.6"
+
+try:
+    input = raw_input
+except NameError:
+    pass
 
 virtual_profiles = [
     # (name, description, callback)
+    ("off", "Disable all outputs", None),
     ("common", "Clone all connected outputs at the largest common resolution", None),
+    ("clone-largest", "Clone all connected outputs with the largest resolution (scaled down if necessary)", None),
     ("horizontal", "Stack all connected outputs horizontally at their largest resolution", None),
     ("vertical", "Stack all connected outputs vertically at their largest resolution", None),
 ]
@@ -49,32 +68,34 @@ help_text = """
 Usage: autorandr [options]
 
 -h, --help              get this small help
--c, --change            reload current setup
--s, --save <profile>    save your current setup to profile <profile>
--l, --load <profile>    load profile <profile>
+-c, --change            automatically load the first detected profile
 -d, --default <profile> make profile <profile> the default profile
---force                 force (re)loading of a profile
---fingerprint           fingerprint your current hardware setup
+-l, --load <profile>    load profile <profile>
+-s, --save <profile>    save your current setup to profile <profile>
+-r, --remove <profile>  remove profile <profile>
+--batch                 run autorandr for all users with active X11 sessions
+--current               only list current (active) configuration(s)
 --config                dump your current xrandr setup
+--debug                 enable verbose output
+--detected              only list detected (available) configuration(s)
 --dry-run               don't change anything, only print the xrandr commands
-
- To prevent a profile from being loaded, place a script call "block" in its
- directory. The script is evaluated before the screen setup is inspected, and
- in case of it returning a value of 0 the profile is skipped. This can be used
- to query the status of a docking station you are about to leave.
+--fingerprint           fingerprint your current hardware setup
+--force                 force (re)loading of a profile
+--skip-options <option> comma separated list of xrandr arguments (e.g. "gamma")
+                        to skip both in detecting changes and applying a profile
+--version               show version information and exit
 
  If no suitable profile can be identified, the current configuration is kept.
  To change this behaviour and switch to a fallback configuration, specify
  --default <profile>.
 
- Another script called "postswitch" can be placed in the directory
- ~/.config/autorandr (or ~/.autorandr if you have an old installation) as well
- as in any profile directories: The scripts are executed after a mode switch
- has taken place and can notify window managers.
+ autorandr supports a set of per-profile and global hooks. See the documentation
+ for details.
 
  The following virtual configurations are available:
 """.strip()
 
+
 class AutorandrException(Exception):
     def __init__(self, message, original_exception=None, report_bug=False):
         self.message = message
@@ -85,34 +106,43 @@ class AutorandrException(Exception):
             while trace.tb_next:
                 trace = trace.tb_next
             self.line = trace.tb_lineno
+            self.file_name = trace.tb_frame.f_code.co_filename
         else:
             try:
                 import inspect
-                self.line = inspect.currentframe().f_back.f_lineno
+                frame = inspect.currentframe().f_back
+                self.line = frame.f_lineno
+                self.file_name = frame.f_code.co_filename
             except:
                 self.line = None
+                self.file_name = None
             self.original_exception = None
 
+        if os.path.abspath(self.file_name) == os.path.abspath(sys.argv[0]):
+            self.file_name = None
+
     def __str__(self):
-        retval = [ self.message ]
+        retval = [self.message]
         if self.line:
-            retval.append(" (line %d)" % self.line)
+            retval.append(" (line %d%s)" % (self.line, ("; %s" % self.file_name) if self.file_name else ""))
         if self.original_exception:
             retval.append(":\n  ")
             retval.append(str(self.original_exception).replace("\n", "\n  "))
         if self.report_bug:
-            retval.append("\nThis appears to be a bug. Please help improving autorandr by reporting it upstream."
-                         "\nPlease attach the output of `xrandr --verbose` to your bug report if appropriate.")
+            retval.append("\nThis appears to be a bug. Please help improving autorandr by reporting it upstream:"
+                          "\nhttps://github.com/phillipberndt/autorandr/issues"
+                          "\nPlease attach the output of `xrandr --verbose` to your bug report if appropriate.")
         return "".join(retval)
 
+
 class XrandrOutput(object):
     "Represents an XRandR output"
 
     # This regular expression is used to parse an output in `xrandr --verbose'
     XRANDR_OUTPUT_REGEXP = """(?x)
         ^(?P<output>[^ ]+)\s+                                                           # Line starts with output name
-        (?:                                                                             # Differentiate disconnected and connected in first line
-            disconnected |
+        (?:                                                                             # Differentiate disconnected and connected
+            disconnected |                                                              # in first line
             unknown\ connection |
             (?P<connected>connected)
         )
@@ -124,7 +154,7 @@ class XrandrOutput(object):
             (?:\(0x[0-9a-fA-F]+\)\s+)?                                                  # XID
             (?P<rotate>(?:normal|left|right|inverted))\s+                               # Rotation
             (?:(?P<reflect>X\ and\ Y|X|Y)\ axis)?                                       # Reflection
-        )?                                                                              # .. but everything of the above only if the screen is in use.
+        )?                                                                              # .. but only if the screen is in use.
         (?:[\ \t]*\([^\)]+\))(?:\s*[0-9]+mm\sx\s[0-9]+mm)?
         (?:[\ \t]*panning\ (?P<panning>[0-9]+x[0-9]+\+[0-9]+\+[0-9]+))?                 # Panning information
         (?:[\ \t]*tracking\ (?P<tracking>[0-9]+x[0-9]+\+[0-9]+\+[0-9]+))?               # Tracking information
@@ -137,8 +167,8 @@ class XrandrOutput(object):
         ))+
         \s*
         (?P<modes>(?:
-            (?P<mode_name>\S+).+?\*current.*\s+                                         # Interesting (current) resolution: Extract rate
-             h:\s+width\s+(?P<mode_width>[0-9]+).+\s+
+            (?P<mode_name>\S+).+?\*current.*\s+                                         # Interesting (current) resolution:
+             h:\s+width\s+(?P<mode_width>[0-9]+).+\s+                                   # Extract rate
              v:\s+height\s+(?P<mode_height>[0-9]+).+clock\s+(?P<rate>[0-9\.]+)Hz\s* |
             \S+(?:(?!\*current).)+\s+h:.+\s+v:.+\s*                                     # Other resolutions
         )*)
@@ -166,7 +196,11 @@ class XrandrOutput(object):
     EDID_UNAVAILABLE = "--CONNECTED-BUT-EDID-UNAVAILABLE-"
 
     def __repr__(self):
-        return "<%s%s %s>" % (self.output, (" %s..%s" % (self.edid[:5], self.edid[-5:])) if self.edid else "", " ".join(self.option_vector))
+        return "<%s%s %s>" % (self.output, self.short_edid, " ".join(self.option_vector))
+
+    @property
+    def short_edid(self):
+        return ("%s..%s" % (self.edid[:5], self.edid[-5:])) if self.edid else ""
 
     @property
     def options_with_defaults(self):
@@ -179,17 +213,33 @@ class XrandrOutput(object):
         if xrandr_version() >= Version("1.2"):
             options.update(self.XRANDR_12_DEFAULTS)
         options.update(self.options)
-        return options
+        return {a: b for a, b in options.items() if a not in self.ignored_options}
+
+    @property
+    def filtered_options(self):
+        "Return a dictionary of options without ignored options"
+        return {a: b for a, b in self.options.items() if a not in self.ignored_options}
 
     @property
     def option_vector(self):
         "Return the command line parameters for XRandR for this instance"
-        return sum([["--%s" % option[0], option[1]] if option[1] else ["--%s" % option[0]] for option in chain((("output", self.output),), sorted(self.options_with_defaults.items()))], [])
+        args = ["--output", self.output]
+        for option, arg in sorted(self.options_with_defaults.items()):
+            args.append("--%s" % option)
+            if arg:
+                args.append(arg)
+        return args
 
     @property
     def option_string(self):
         "Return the command line parameters in the configuration file format"
-        return "\n".join([ " ".join(option) if option[1] else option[0] for option in chain((("output", self.output),), sorted(self.options.items()))])
+        options = ["output %s" % self.output]
+        for option, arg in sorted(self.filtered_options.items()):
+            if arg:
+                options.append("%s %s" % (option, arg))
+            else:
+                options.append(option)
+        return "\n".join(options)
 
     @property
     def sort_key(self):
@@ -209,12 +259,17 @@ class XrandrOutput(object):
         self.output = output
         self.edid = edid
         self.options = options
+        self.ignored_options = []
         self.remove_default_option_values()
 
+    def set_ignored_options(self, options):
+        "Set a list of xrandr options that are never used (neither when comparing configurations nor when applying them)"
+        self.ignored_options = list(options)
+
     def remove_default_option_values(self):
         "Remove values from the options dictionary that are superflous"
         if "off" in self.options and len(self.options.keys()) > 1:
-            self.options = { "off": None }
+            self.options = {"off": None}
             return
         for option, default_value in self.XRANDR_DEFAULTS.items():
             if option in self.options and self.options[option] == default_value:
@@ -230,28 +285,37 @@ class XrandrOutput(object):
             xrandr_output = xrandr_output.replace("\r\n", "\n")
             match_object = re.search(XrandrOutput.XRANDR_OUTPUT_REGEXP, xrandr_output)
         except:
-            raise AutorandrException("Parsing XRandR output failed, there is an error in the regular expression.", report_bug = True)
+            raise AutorandrException("Parsing XRandR output failed, there is an error in the regular expression.",
+                                     report_bug=True)
         if not match_object:
             debug = debug_regexp(XrandrOutput.XRANDR_OUTPUT_REGEXP, xrandr_output)
-            raise AutorandrException("Parsing XRandR output failed, the regular expression did not match: %s" % debug, report_bug = True)
+            raise AutorandrException("Parsing XRandR output failed, the regular expression did not match: %s" % debug,
+                                     report_bug=True)
         remainder = xrandr_output[len(match_object.group(0)):]
         if remainder:
-            raise AutorandrException(("Parsing XRandR output failed, %d bytes left unmatched after regular expression, "
-                                "starting at byte %d with ..'%s'.") % (len(remainder), len(match_object.group(0)), remainder[:10]), report_bug=True)
+            raise AutorandrException("Parsing XRandR output failed, %d bytes left unmatched after "
+                                     "regular expression, starting at byte %d with ..'%s'." %
+                                     (len(remainder), len(match_object.group(0)), remainder[:10]),
+                                     report_bug=True)
 
         match = match_object.groupdict()
 
         modes = []
         if match["modes"]:
-            modes = [ x.groupdict() for x in re.finditer(XrandrOutput.XRANDR_OUTPUT_MODES_REGEXP, match["modes"]) if x.group("name") ]
+            modes = []
+            for mode_match in re.finditer(XrandrOutput.XRANDR_OUTPUT_MODES_REGEXP, match["modes"]):
+                if mode_match.group("name"):
+                    modes.append(mode_match.groupdict())
             if not modes:
                 raise AutorandrException("Parsing XRandR output failed, couldn't find any display modes", report_bug=True)
 
         options = {}
         if not match["connected"]:
             edid = None
+        elif match["edid"]:
+            edid = "".join(match["edid"].strip().split())
         else:
-            edid = "".join(match["edid"].strip().split()) if match["edid"] else "%s-%s" % (XrandrOutput.EDID_UNAVAILABLE, match["output"])
+            edid = "%s-%s" % (XrandrOutput.EDID_UNAVAILABLE, match["output"])
 
         if not match["width"]:
             options["off"] = None
@@ -276,26 +340,27 @@ class XrandrOutput(object):
                 options["reflect"] = "xy"
             options["pos"] = "%sx%s" % (match["x"], match["y"])
             if match["panning"]:
-                panning = [ match["panning"] ]
+                panning = [match["panning"]]
                 if match["tracking"]:
-                    panning += [ "/", match["tracking"] ]
+                    panning += ["/", match["tracking"]]
                     if match["border"]:
-                        panning += [ "/", match["border"] ]
+                        panning += ["/", match["border"]]
                 options["panning"] = "".join(panning)
             if match["transform"]:
                 transformation = ",".join(match["transform"].strip().split())
                 if transformation != "1.000000,0.000000,0.000000,0.000000,1.000000,0.000000,0.000000,0.000000,1.000000":
                     options["transform"] = transformation
                     if not match["mode_name"]:
-                        # TODO We'd need to apply the reverse transformation here. Let's see if someone complains, I doubt that this
-                        # special case is actually required.
-                        print("Warning: Output %s has a transformation applied. Could not determine correct mode! Using `%s'." % (match["output"], options["mode"]), file=sys.stderr)
+                        # TODO We'd need to apply the reverse transformation here. Let's see if someone complains,
+                        # I doubt that this special case is actually required.
+                        print("Warning: Output %s has a transformation applied. Could not determine correct mode! "
+                              "Using `%s'." % (match["output"], options["mode"]), file=sys.stderr)
             if match["gamma"]:
                 gamma = match["gamma"].strip()
                 # xrandr prints different values in --verbose than it accepts as a parameter value for --gamma
                 # Also, it is not able to work with non-standard gamma ramps. Finally, it auto-corrects 0 to 1,
                 # so we approximate by 1e-10.
-                gamma = ":".join([ str(max(1e-10, round(1./float(x), 3))) for x in gamma.split(":") ])
+                gamma = ":".join([str(max(1e-10, round(1. / float(x), 3))) for x in gamma.split(":")])
                 options["gamma"] = gamma
             if match["rate"]:
                 options["rate"] = match["rate"]
@@ -309,6 +374,8 @@ class XrandrOutput(object):
         for line in configuration.split("\n"):
             if line:
                 line = line.split(None, 1)
+                if line and line[0].startswith("#"):
+                    continue
                 options[line[0]] = line[1] if len(line) > 1 else None
 
         edid = None
@@ -317,12 +384,13 @@ class XrandrOutput(object):
             edid = edid_map[options["output"]]
         else:
             # This fuzzy matching is for legacy autorandr that used sysfs output names
-            fuzzy_edid_map = [ re.sub("(card[0-9]+|-)", "", x) for x in edid_map.keys() ]
+            fuzzy_edid_map = [re.sub("(card[0-9]+|-)", "", x) for x in edid_map.keys()]
             fuzzy_output = re.sub("(card[0-9]+|-)", "", options["output"])
             if fuzzy_output in fuzzy_edid_map:
                 edid = edid_map[list(edid_map.keys())[fuzzy_edid_map.index(fuzzy_output)]]
             elif "off" not in options:
-                raise AutorandrException("Failed to find an EDID for output `%s' in setup file, required as `%s' is not off in config file." % (options["output"], options["output"]))
+                raise AutorandrException("Failed to find an EDID for output `%s' in setup file, required as `%s' "
+                                         "is not off in config file." % (options["output"], options["output"]))
         output = options["output"]
         del options["output"]
 
@@ -335,10 +403,42 @@ class XrandrOutput(object):
                 return hashlib.md5(binascii.unhexlify(other.edid)).hexdigest() == self.edid
             if len(self.edid) != 32 and len(other.edid) == 32 and not self.edid.startswith(XrandrOutput.EDID_UNAVAILABLE):
                 return hashlib.md5(binascii.unhexlify(self.edid)).hexdigest() == other.edid
+            if "*" in self.edid:
+                return fnmatch.fnmatch(other.edid, self.edid)
+            elif "*" in other.edid:
+                return fnmatch.fnmatch(self.edid, other.edid)
         return self.edid == other.edid
 
+    def __ne__(self, other):
+        return not (self == other)
+
     def __eq__(self, other):
-        return self.edid_equals(other) and self.output == other.output and self.options == other.options
+        return self.edid_equals(other) and self.output == other.output and self.filtered_options == other.filtered_options
+
+    def verbose_diff(self, other):
+        "Compare to another XrandrOutput and return a list of human readable differences"
+        diffs = []
+        if not self.edid_equals(other):
+            diffs.append("EDID `%s' differs from `%s'" % (self.short_edid, other.short_edid))
+        if self.output != other.output:
+            diffs.append("Output name `%s' differs from `%s'" % (self.output, other.output))
+        if "off" in self.options and "off" not in other.options:
+            diffs.append("The output is disabled currently, but active in the new configuration")
+        elif "off" in other.options and "off" not in self.options:
+            diffs.append("The output is currently enabled, but inactive in the new configuration")
+        else:
+            for name in set(chain.from_iterable((self.options.keys(), other.options.keys()))):
+                if name not in other.options:
+                    diffs.append("Option --%s %sis not present in the new configuration" %
+                                 (name, "(= `%s') " % self.options[name] if self.options[name] else ""))
+                elif name not in self.options:
+                    diffs.append("Option --%s (`%s' in the new configuration) is not present currently" %
+                                 (name, other.options[name]))
+                elif self.options[name] != other.options[name]:
+                    diffs.append("Option --%s %sis `%s' in the new configuration" %
+                                 (name, "(= `%s') " % self.options[name] if self.options[name] else "", other.options[name]))
+        return diffs
+
 
 def xrandr_version():
     "Return the version of XRandR that this system uses"
@@ -352,24 +452,26 @@ def xrandr_version():
 
     return xrandr_version.version
 
+
 def debug_regexp(pattern, string):
     "Use the partial matching functionality of the regex module to display debug info on a non-matching regular expression"
     try:
         import regex
-        bounds = ( 0, len(string) )
+        bounds = (0, len(string))
         while bounds[0] != bounds[1]:
             half = int((bounds[0] + bounds[1]) / 2)
             if half == bounds[0]:
                 break
             bounds = (half, bounds[1]) if regex.search(pattern, string[:half], partial=True) else (bounds[0], half - 1)
         partial_length = bounds[0]
-        return ("Regular expression matched until position "
-              "%d, ..'%s', and did not match from '%s'.." % (partial_length, string[max(0, partial_length-20):partial_length],
-                                                             string[partial_length:partial_length+10]))
+        return ("Regular expression matched until position %d, ..'%s', and did not match from '%s'.." %
+                (partial_length, string[max(0, partial_length - 20):partial_length],
+                 string[partial_length:partial_length + 10]))
     except ImportError:
         pass
     return "Debug information would be available if the `regex' module was installed."
 
+
 def parse_xrandr_output():
     "Parse the output of `xrandr --verbose' into a list of outputs"
     xrandr_output = os.popen("xrandr -q --verbose").read()
@@ -387,31 +489,32 @@ def parse_xrandr_output():
     modes = OrderedDict()
     for i in range(1, len(split_xrandr_output), 2):
         output_name = split_xrandr_output[i].split()[0]
-        output, output_modes = XrandrOutput.from_xrandr_output("".join(split_xrandr_output[i:i+2]))
+        output, output_modes = XrandrOutput.from_xrandr_output("".join(split_xrandr_output[i:i + 2]))
         outputs[output_name] = output
         if output_modes:
             modes[output_name] = output_modes
 
     return outputs, modes
 
+
 def load_profiles(profile_path):
     "Load the stored profiles"
 
     profiles = {}
     for profile in os.listdir(profile_path):
         config_name = os.path.join(profile_path, profile, "config")
-        setup_name  = os.path.join(profile_path, profile, "setup")
+        setup_name = os.path.join(profile_path, profile, "setup")
         if not os.path.isfile(config_name) or not os.path.isfile(setup_name):
             continue
 
-        edids = dict([ x.strip().split() for x in open(setup_name).readlines() if x.strip() ])
+        edids = dict([x.split() for x in (y.strip() for y in open(setup_name).readlines()) if x and x[0] != "#"])
 
         config = {}
         buffer = []
         for line in chain(open(config_name).readlines(), ["output"]):
             if line[:6] == "output" and buffer:
                 config[buffer[0].strip().split()[-1]] = XrandrOutput.from_config_file(edids, "".join(buffer))
-                buffer = [ line ]
+                buffer = [line]
             else:
                 buffer.append(line)
 
@@ -419,10 +522,27 @@ def load_profiles(profile_path):
             if config[output_name].edid is None:
                 del config[output_name]
 
-        profiles[profile] = { "config": config, "path": os.path.join(profile_path, profile), "config-mtime": os.stat(config_name).st_mtime }
+        profiles[profile] = {
+            "config": config,
+            "path": os.path.join(profile_path, profile),
+            "config-mtime": os.stat(config_name).st_mtime,
+        }
 
     return profiles
 
+
+def get_symlinks(profile_path):
+    "Load all symlinks from a directory"
+
+    symlinks = {}
+    for link in os.listdir(profile_path):
+        file_name = os.path.join(profile_path, link)
+        if os.path.islink(file_name):
+            symlinks[link] = os.readlink(file_name)
+
+    return symlinks
+
+
 def find_profiles(current_config, profiles):
     "Find profiles matching the currently connected outputs"
     detected_profiles = []
@@ -435,18 +555,21 @@ def find_profiles(current_config, profiles):
             if name not in current_config or not output.edid_equals(current_config[name]):
                 matches = False
                 break
-        if not matches or any(( name not in config.keys() for name in current_config.keys() if current_config[name].edid )):
+        if not matches or any((name not in config.keys() for name in current_config.keys() if current_config[name].edid)):
             continue
         if matches:
             detected_profiles.append(profile_name)
     return detected_profiles
 
-def profile_blocked(profile_path):
-    "Check if a profile is blocked"
-    script = os.path.join(profile_path, "block")
-    if not os.access(script, os.X_OK | os.F_OK):
-        return False
-    return subprocess.call(script) == 0
+
+def profile_blocked(profile_path, meta_information=None):
+    """Check if a profile is blocked.
+
+    meta_information is expected to be an dictionary. It will be passed to the block scripts
+    in the environment, as variables called AUTORANDR_<CAPITALIZED_KEY_HERE>.
+    """
+    return not exec_scripts(profile_path, "block", meta_information)
+
 
 def output_configuration(configuration, config):
     "Write a configuration file"
@@ -454,6 +577,7 @@ def output_configuration(configuration, config):
     for output in outputs:
         print(configuration[output].option_string, file=config)
 
+
 def output_setup(configuration, setup):
     "Write a setup (fingerprint) file"
     outputs = sorted(configuration.keys())
@@ -461,6 +585,7 @@ def output_setup(configuration, setup):
         if configuration[output].edid:
             print(output, configuration[output].edid, file=setup)
 
+
 def save_configuration(profile_path, configuration):
     "Save a configuration into a profile"
     if not os.path.isdir(profile_path):
@@ -470,6 +595,7 @@ def save_configuration(profile_path, configuration):
     with open(os.path.join(profile_path, "setup"), "w") as setup:
         output_setup(configuration, setup)
 
+
 def update_mtime(filename):
     "Update a file's mtime"
     try:
@@ -478,13 +604,72 @@ def update_mtime(filename):
     except:
         return False
 
+
+def call_and_retry(*args, **kwargs):
+    """Wrapper around subprocess.call that retries failed calls.
+
+    This function calls subprocess.call and on non-zero exit states,
+    waits a second and then retries once. This mitigates #47,
+    a timing issue with some drivers.
+    """
+    if "dry_run" in kwargs:
+        dry_run = kwargs["dry_run"]
+        del kwargs["dry_run"]
+    else:
+        dry_run = False
+    kwargs_redirected = dict(kwargs)
+    if not dry_run:
+        if hasattr(subprocess, "DEVNULL"):
+            kwargs_redirected["stdout"] = getattr(subprocess, "DEVNULL")
+        else:
+            kwargs_redirected["stdout"] = open(os.devnull, "w")
+        kwargs_redirected["stderr"] = kwargs_redirected["stdout"]
+    retval = subprocess.call(*args, **kwargs_redirected)
+    if retval != 0:
+        time.sleep(1)
+        retval = subprocess.call(*args, **kwargs)
+    return retval
+
+
+def get_fb_dimensions(configuration):
+    width = 0
+    height = 0
+    for output in configuration.values():
+        if "off" in output.options or not output.edid:
+            continue
+        # This won't work with all modes -- but it's a best effort.
+        o_width, o_height = map(int, output.options["mode"].split("x"))
+        if "transform" in output.options:
+            a, b, c, d, e, f, g, h, i = map(float, output.options["transform"].split(","))
+            w = (g * o_width + h * o_height + i)
+            x = (a * o_width + b * o_height + c) / w
+            y = (d * o_width + e * o_height + f) / w
+            o_width, o_height = x, y
+        if "rotate" in output.options:
+            if output.options["rotate"] in ("left", "right"):
+                o_width, o_height = o_height, o_width
+        if "pos" in output.options:
+            o_left, o_top = map(int, output.options["pos"].split("x"))
+            o_width += o_left
+            o_height += o_top
+        if "panning" in output.options:
+            match = re.match("(?P<w>[0-9]+)x(?P<h>[0-9]+)(?:\+(?P<x>[0-9]+))?(?:\+(?P<y>[0-9]+))?.*", output.options["panning"])
+            if match:
+                detail = match.groupdict()
+                o_width = int(detail.get("w")) + int(detail.get("x", "0"))
+                o_height = int(detail.get("h")) + int(detail.get("y", "0"))
+        width = max(width, o_width)
+        height = max(height, o_height)
+    return int(width), int(height)
+
+
 def apply_configuration(new_configuration, current_configuration, dry_run=False):
     "Apply a configuration"
     outputs = sorted(new_configuration.keys(), key=lambda x: new_configuration[x].sort_key)
     if dry_run:
-        base_argv = [ "echo", "xrandr" ]
+        base_argv = ["echo", "xrandr"]
     else:
-        base_argv = [ "xrandr" ]
+        base_argv = ["xrandr"]
 
     # There are several xrandr / driver bugs we need to take care of here:
     # - We cannot enable more than two screens at the same time
@@ -500,6 +685,18 @@ def apply_configuration(new_configuration, current_configuration, dry_run=False)
     #   the xrandr call fails with an invalid RRSetScreenSize parameter error.
     #   Update the configuration in 3 passes in that case.  (On Haswell graphics,
     #   at least.)
+    # - Some implementations can not handle --transform at all, so avoid it unless
+    #   necessary. (See https://github.com/phillipberndt/autorandr/issues/37)
+    # - Some implementations can not handle --panning without specifying --fb
+    #   explicitly, so avoid it unless necessary.
+    #   (See https://github.com/phillipberndt/autorandr/issues/72)
+
+    fb_dimensions = get_fb_dimensions(new_configuration)
+    try:
+        base_argv += ["--fb", "%dx%d" % fb_dimensions]
+    except:
+        # Failed to obtain frame-buffer size. Doesn't matter, xrandr will choose for the user.
+        pass
 
     auxiliary_changes_pre = []
     disable_outputs = []
@@ -511,20 +708,33 @@ def apply_configuration(new_configuration, current_configuration, dry_run=False)
         else:
             if "off" not in current_configuration[output].options:
                 remain_active_count += 1
-            enable_outputs.append(new_configuration[output].option_vector)
-            if xrandr_version() >= Version("1.3.0") and "transform" in current_configuration[output].options:
-                auxiliary_changes_pre.append(["--output", output, "--transform", "none"])
+
+            option_vector = new_configuration[output].option_vector
+            if xrandr_version() >= Version("1.3.0"):
+                for option, off_value in (("transform", "none"), ("panning", "0x0")):
+                    if option in current_configuration[output].options:
+                        auxiliary_changes_pre.append(["--output", output, "--%s" % option, off_value])
+                    else:
+                        try:
+                            option_index = option_vector.index("--%s" % option)
+                            if option_vector[option_index + 1] == XrandrOutput.XRANDR_DEFAULTS[option]:
+                                option_vector = option_vector[:option_index] + option_vector[option_index + 2:]
+                        except ValueError:
+                            pass
+
+            enable_outputs.append(option_vector)
 
     # Perform pe-change auxiliary changes
     if auxiliary_changes_pre:
         argv = base_argv + list(chain.from_iterable(auxiliary_changes_pre))
-        if subprocess.call(argv) != 0:
+        if call_and_retry(argv, dry_run=dry_run) != 0:
             raise AutorandrException("Command failed: %s" % " ".join(argv))
 
     # Disable unused outputs, but make sure that there always is at least one active screen
     disable_keep = 0 if remain_active_count else 1
     if len(disable_outputs) > disable_keep:
-        if subprocess.call(base_argv + list(chain.from_iterable(disable_outputs[:-1] if disable_keep else disable_outputs))) != 0:
+        argv = base_argv + list(chain.from_iterable(disable_outputs[:-1] if disable_keep else disable_outputs))
+        if call_and_retry(argv, dry_run=dry_run) != 0:
             # Disabling the outputs failed. Retry with the next command:
             # Sometimes disabling of outputs fails due to an invalid RRSetScreenSize.
             # This does not occur if simultaneously the primary screen is reset.
@@ -542,34 +752,70 @@ def apply_configuration(new_configuration, current_configuration, dry_run=False)
     # Enable the remaining outputs in pairs of two operations
     operations = disable_outputs + enable_outputs
     for index in range(0, len(operations), 2):
-        argv = base_argv + list(chain.from_iterable(operations[index:index+2]))
-        if subprocess.call(argv) != 0:
+        argv = base_argv + list(chain.from_iterable(operations[index:index + 2]))
+        if call_and_retry(argv, dry_run=dry_run) != 0:
             raise AutorandrException("Command failed: %s" % " ".join(argv))
 
+
+def is_equal_configuration(source_configuration, target_configuration):
+    """
+        Check if all outputs from target are already configured correctly in source and
+        that no other outputs are active.
+    """
+    for output in target_configuration.keys():
+        if "off" in target_configuration[output].options:
+            if (output in source_configuration and "off" not in source_configuration[output].options):
+                return False
+        else:
+            if (output not in source_configuration) or (source_configuration[output] != target_configuration[output]):
+                return False
+    for output in source_configuration.keys():
+        if "off" in source_configuration[output].options:
+            if output in target_configuration and "off" not in target_configuration[output].options:
+                return False
+        else:
+            if output not in target_configuration:
+                return False
+    return True
+
+
 def add_unused_outputs(source_configuration, target_configuration):
     "Add outputs that are missing in target to target, in 'off' state"
     for output_name, output in source_configuration.items():
         if output_name not in target_configuration:
-            target_configuration[output_name] = XrandrOutput(output_name, output.edid, { "off": None })
+            target_configuration[output_name] = XrandrOutput(output_name, output.edid, {"off": None})
+
 
 def remove_irrelevant_outputs(source_configuration, target_configuration):
     "Remove outputs from target that ought to be 'off' and already are"
     for output_name, output in source_configuration.items():
-        if "off" in output.options and output_name in target_configuration and "off" in target_configuration[output_name].options:
-            del target_configuration[output_name]
+        if "off" in output.options:
+            if output_name in target_configuration:
+                if "off" in target_configuration[output_name].options:
+                    del target_configuration[output_name]
+
 
 def generate_virtual_profile(configuration, modes, profile_name):
     "Generate one of the virtual profiles"
     configuration = copy.deepcopy(configuration)
     if profile_name == "common":
-        common_resolution = [ set(( ( mode["width"], mode["height"] ) for mode in output )) for output in modes.values() ]
-        common_resolution = reduce(lambda a, b: a & b, common_resolution[1:], common_resolution[0])
-        common_resolution = sorted(common_resolution, key=lambda a: int(a[0])*int(a[1]))
+        mode_sets = []
+        for output, output_modes in modes.items():
+            mode_set = set()
+            if configuration[output].edid:
+                for mode in output_modes:
+                    mode_set.add((mode["width"], mode["height"]))
+            mode_sets.append(mode_set)
+        common_resolution = reduce(lambda a, b: a & b, mode_sets[1:], mode_sets[0])
+        common_resolution = sorted(common_resolution, key=lambda a: int(a[0]) * int(a[1]))
         if common_resolution:
             for output in configuration:
                 configuration[output].options = {}
-                if output in modes:
-                    configuration[output].options["mode"] = [ x["name"] for x in sorted(modes[output], key=lambda x: 0 if x["preferred"] else 1) if x["width"] == common_resolution[-1][0] and x["height"] == common_resolution[-1][1] ][0]
+                if output in modes and configuration[output].edid:
+                    modes_sorted = sorted(modes[output], key=lambda x: 0 if x["preferred"] else 1)
+                    modes_filtered = [x for x in modes_sorted if (x["width"], x["height"]) == common_resolution[-1]]
+                    mode = modes_filtered[0]
+                    configuration[output].options["mode"] = mode['name']
                     configuration[output].options["pos"] = "0x0"
                 else:
                     configuration[output].options["off"] = None
@@ -584,43 +830,318 @@ def generate_virtual_profile(configuration, modes, profile_name):
 
         for output in configuration:
             configuration[output].options = {}
-            if output in modes:
-                mode = sorted(modes[output], key=lambda a: int(a["width"])*int(a["height"]) + (10**6 if a["preferred"] else 0))[-1]
+            if output in modes and configuration[output].edid:
+                def key(a):
+                    score = int(a["width"]) * int(a["height"])
+                    if a["preferred"]:
+                        score += 10**6
+                    return score
+                output_modes = sorted(modes[output], key=key)
+                mode = output_modes[-1]
                 configuration[output].options["mode"] = mode["name"]
                 configuration[output].options["rate"] = mode["rate"]
                 configuration[output].options["pos"] = pos_specifier % shift
                 shift += int(mode[shift_index])
             else:
                 configuration[output].options["off"] = None
+    elif profile_name == "clone-largest":
+        modes_unsorted = [output_modes[0] for output, output_modes in modes.items()]
+        modes_sorted = sorted(modes_unsorted, key=lambda x: int(x["width"]) * int(x["height"]), reverse=True)
+        biggest_resolution = modes_sorted[0]
+        for output in configuration:
+            configuration[output].options = {}
+            if output in modes and configuration[output].edid:
+                def key(a):
+                    score = int(a["width"]) * int(a["height"])
+                    if a["preferred"]:
+                        score += 10**6
+                    return score
+                output_modes = sorted(modes[output], key=key)
+                mode = output_modes[-1]
+                configuration[output].options["mode"] = mode["name"]
+                configuration[output].options["rate"] = mode["rate"]
+                configuration[output].options["pos"] = "0x0"
+                scale = max(float(biggest_resolution["width"]) / float(mode["width"]),
+                            float(biggest_resolution["height"]) / float(mode["height"]))
+                mov_x = (float(mode["width"]) * scale - float(biggest_resolution["width"])) / -2
+                mov_y = (float(mode["height"]) * scale - float(biggest_resolution["height"])) / -2
+                configuration[output].options["transform"] = "{},0,{},0,{},{},0,0,1".format(scale, mov_x, scale, mov_y)
+            else:
+                configuration[output].options["off"] = None
+    elif profile_name == "off":
+        for output in configuration:
+            for key in list(configuration[output].options.keys()):
+                del configuration[output].options[key]
+            configuration[output].options["off"] = None
     return configuration
 
+
+def print_profile_differences(one, another):
+    "Print the differences between two profiles for debugging"
+    if one == another:
+        return
+    print("| Differences between the two profiles:")
+    for output in set(chain.from_iterable((one.keys(), another.keys()))):
+        if output not in one:
+            if "off" not in another[output].options:
+                print("| Output `%s' is missing from the active configuration" % output)
+        elif output not in another:
+            if "off" not in one[output].options:
+                print("| Output `%s' is missing from the new configuration" % output)
+        else:
+            for line in one[output].verbose_diff(another[output]):
+                print("| [Output %s] %s" % (output, line))
+    print("\\-")
+
+
 def exit_help():
     "Print help and exit"
     print(help_text)
     for profile in virtual_profiles:
-        print("  %-10s %s" % profile[:2])
+        name, description = profile[:2]
+        description = [description]
+        max_width = 78 - 18
+        while len(description[0]) > max_width + 1:
+            left_over = description[0][max_width:]
+            description[0] = description[0][:max_width] + "-"
+            description.insert(1, "  %-15s %s" % ("", left_over))
+        description = "\n".join(description)
+        print("  %-15s %s" % (name, description))
     sys.exit(0)
 
-def exec_scripts(profile_path, script_name):
-    "Run userscripts"
-    for script in (os.path.join(profile_path, script_name), os.path.join(os.path.dirname(profile_path), script_name)):
-        if os.access(script, os.X_OK | os.F_OK):
-            subprocess.call(script)
+
+def exec_scripts(profile_path, script_name, meta_information=None):
+    """"Run userscripts
+
+    This will run all executables from the profile folder, and global per-user
+    and system-wide configuration folders, named script_name or residing in
+    subdirectories named script_name.d.
+
+    If profile_path is None, only global scripts will be invoked.
+
+    meta_information is expected to be an dictionary. It will be passed to the block scripts
+    in the environment, as variables called AUTORANDR_<CAPITALIZED_KEY_HERE>.
+
+    Returns True unless any of the scripts exited with non-zero exit status.
+    """
+    all_ok = True
+    env = os.environ.copy()
+    if meta_information:
+        for key, value in meta_information.items():
+            env["AUTORANDR_{}".format(key.upper())] = str(value)
+
+    # If there are multiple candidates, the XDG spec tells to only use the first one.
+    ran_scripts = set()
+
+    user_profile_path = os.path.expanduser("~/.autorandr")
+    if not os.path.isdir(user_profile_path):
+        user_profile_path = os.path.join(os.environ.get("XDG_CONFIG_HOME", os.path.expanduser("~/.config")), "autorandr")
+
+    candidate_directories = [user_profile_path]
+    for config_dir in os.environ.get("XDG_CONFIG_DIRS", "/etc/xdg").split(":"):
+        candidate_directories.append(os.path.join(config_dir, "autorandr"))
+    if profile_path:
+        candidate_directories.append(profile_path)
+
+    for folder in candidate_directories:
+        if script_name not in ran_scripts:
+            script = os.path.join(folder, script_name)
+            if os.access(script, os.X_OK | os.F_OK):
+                try:
+                    all_ok &= subprocess.call(script, env=env) != 0
+                except:
+                    raise AutorandrException("Failed to execute user command: %s" % (script,))
+                ran_scripts.add(script_name)
+
+        script_folder = os.path.join(folder, "%s.d" % script_name)
+        if os.access(script_folder, os.R_OK | os.X_OK) and os.path.isdir(script_folder):
+            for file_name in os.listdir(script_folder):
+                check_name = "d/%s" % (file_name,)
+                if check_name not in ran_scripts:
+                    script = os.path.join(script_folder, file_name)
+                    if os.access(script, os.X_OK | os.F_OK):
+                        try:
+                            all_ok &= subprocess.call(script, env=env) != 0
+                        except:
+                            raise AutorandrException("Failed to execute user command: %s" % (script,))
+                        ran_scripts.add(check_name)
+
+    return all_ok
+
+
+def dispatch_call_to_sessions(argv):
+    """Invoke autorandr for each open local X11 session with the given options.
+
+    The function iterates over all processes not owned by root and checks
+    whether they have DISPLAY and XAUTHORITY variables set. It strips the
+    screen from any variable it finds (i.e. :0.0 becomes :0) and checks whether
+    this display has been handled already. If it has not, it forks, changes
+    uid/gid to the user owning the process, reuses the process's environment
+    and runs autorandr with the parameters from argv.
+
+    This function requires root permissions. It only works for X11 servers that
+    have at least one non-root process running. It is susceptible for attacks
+    where one user runs a process with another user's DISPLAY variable - in
+    this case, it might happen that autorandr is invoked for the other user,
+    which won't work. Since no other harm than prevention of automated
+    execution of autorandr can be done this way, the assumption is that in this
+    situation, the local administrator will handle the situation."""
+
+    X11_displays_done = set()
+
+    autorandr_binary = os.path.abspath(argv[0])
+    backup_candidates = {}
+
+    def fork_child_autorandr(pwent, process_environ):
+        print("Running autorandr as %s for display %s" % (pwent.pw_name, process_environ["DISPLAY"]))
+        child_pid = os.fork()
+        if child_pid == 0:
+            # This will throw an exception if any of the privilege changes fails,
+            # so it should be safe. Also, note that since the environment
+            # is taken from a process owned by the user, reusing it should
+            # not leak any information.
+            os.setgroups([])
+            os.setresgid(pwent.pw_gid, pwent.pw_gid, pwent.pw_gid)
+            os.setresuid(pwent.pw_uid, pwent.pw_uid, pwent.pw_uid)
+            os.chdir(pwent.pw_dir)
+            os.environ.clear()
+            os.environ.update(process_environ)
+            os.execl(autorandr_binary, autorandr_binary, *argv[1:])
+            os.exit(1)
+        os.waitpid(child_pid, 0)
+
+    for directory in os.listdir("/proc"):
+        directory = os.path.join("/proc/", directory)
+        if not os.path.isdir(directory):
+            continue
+        environ_file = os.path.join(directory, "environ")
+        if not os.path.isfile(environ_file):
+            continue
+        uid = os.stat(environ_file).st_uid
+
+        # The following line assumes that user accounts start at 1000 and that
+        # no one works using the root or another system account. This is rather
+        # restrictive, but de facto default. Alternatives would be to use the
+        # UID_MIN from /etc/login.defs or FIRST_UID from /etc/adduser.conf;
+        # but effectively, both values aren't binding in any way.
+        # If this breaks your use case, please file a bug on Github.
+        if uid < 1000:
+            continue
+
+        process_environ = {}
+        for environ_entry in open(environ_file).read().split("\0"):
+            name, sep, value = environ_entry.partition("=")
+            if name and sep:
+                if name == "DISPLAY" and "." in value:
+                    value = value[:value.find(".")]
+                process_environ[name] = value
+
+        if "DISPLAY" not in process_environ:
+            # Cannot work with this environment, skip.
+            continue
+
+        # To allow scripts to detect batch invocation (especially useful for predetect)
+        process_environ["AUTORANDR_BATCH_PID"] = str(os.getpid())
+        process_environ["UID"] = str(uid)
+
+        display = process_environ["DISPLAY"]
+
+        if "XAUTHORITY" not in process_environ:
+            # It's very likely that we cannot work with this environment either,
+            # but keep it as a backup just in case we don't find anything else.
+            backup_candidates[display] = process_environ
+            continue
+
+        if display not in X11_displays_done:
+            try:
+                pwent = pwd.getpwuid(uid)
+            except KeyError:
+                # User has no pwd entry
+                continue
+
+            fork_child_autorandr(pwent, process_environ)
+            X11_displays_done.add(display)
+
+    # Run autorandr for any users/displays which didn't have a process with
+    # XAUTHORITY set.
+    for display, process_environ in backup_candidates.items():
+        if display not in X11_displays_done:
+            try:
+                pwent = pwd.getpwuid(int(process_environ["UID"]))
+            except KeyError:
+                # User has no pwd entry
+                continue
+
+            fork_child_autorandr(pwent, process_environ)
+            X11_displays_done.add(display)
+
+
+def enabled_monitors(config):
+    monitors = []
+    for monitor in config:
+        if "--off" in config[monitor].option_vector:
+            continue
+        monitors.append(monitor)
+    return monitors
+
+
+def read_config(options, directory):
+    """Parse a configuration config.ini from directory and merge it into
+    the options dictionary"""
+    config = configparser.ConfigParser()
+    config.read(os.path.join(directory, "settings.ini"))
+    if config.has_section("config"):
+        for key, value in config.items("config"):
+            options.setdefault("--%s" % key, value)
 
 def main(argv):
     try:
-       options = dict(getopt.getopt(argv[1:], "s:l:d:cfh", [ "dry-run", "change", "default=", "save=", "load=", "force", "fingerprint", "config", "help" ])[0])
+        opts, args = getopt.getopt(argv[1:], "s:r:l:d:cfh",
+                                   ["batch", "dry-run", "change", "default=", "save=", "remove=", "load=",
+                                    "force", "fingerprint", "config", "debug", "skip-options=", "help",
+                                    "current", "detected", "version"])
     except getopt.GetoptError as e:
-        print(str(e))
-        options = { "--help": True }
+        print("Failed to parse options: {0}.\n"
+              "Use --help to get usage information.".format(str(e)),
+              file=sys.stderr)
+        sys.exit(posix.EX_USAGE)
+
+    options = dict(opts)
+
+    if "-h" in options or "--help" in options:
+        exit_help()
+
+    if "--version" in options:
+        print("autorandr " + __version__)
+        sys.exit(0)
+
+    if "--current" in options and "--detected" in options:
+        print("--current and --detected are mutually exclusive.", file=sys.stderr)
+        sys.exit(posix.EX_USAGE)
+
+    # Batch mode
+    if "--batch" in options:
+        if ("DISPLAY" not in os.environ or not os.environ["DISPLAY"]) and os.getuid() == 0:
+            dispatch_call_to_sessions([x for x in argv if x != "--batch"])
+        else:
+            print("--batch mode can only be used by root and if $DISPLAY is unset")
+        return
+    if "AUTORANDR_BATCH_PID" in os.environ:
+        user = pwd.getpwuid(os.getuid())
+        user = user.pw_name if user else "#%d" % os.getuid()
+        print("autorandr running as user %s (started from batch instance)" % user)
 
     profiles = {}
+    profile_symlinks = {}
     try:
         # Load profiles from each XDG config directory
-        for directory in os.environ.get("XDG_CONFIG_DIRS", "").split(":"):
+        # The XDG spec says that earlier entries should take precedence, so reverse the order
+        for directory in reversed(os.environ.get("XDG_CONFIG_DIRS", "/etc/xdg").split(":")):
             system_profile_path = os.path.join(directory, "autorandr")
             if os.path.isdir(system_profile_path):
                 profiles.update(load_profiles(system_profile_path))
+                profile_symlinks.update(get_symlinks(system_profile_path))
+                read_config(options, system_profile_path)
         # For the user's profiles, prefer the legacy ~/.autorandr if it already exists
         # profile_path is also used later on to store configurations
         profile_path = os.path.expanduser("~/.autorandr")
@@ -629,11 +1150,16 @@ def main(argv):
             profile_path = os.path.join(os.environ.get("XDG_CONFIG_HOME", os.path.expanduser("~/.config")), "autorandr")
         if os.path.isdir(profile_path):
             profiles.update(load_profiles(profile_path))
+            profile_symlinks.update(get_symlinks(profile_path))
+            read_config(options, profile_path)
         # Sort by descending mtime
         profiles = OrderedDict(sorted(profiles.items(), key=lambda x: -x[1]["config-mtime"]))
     except Exception as e:
         raise AutorandrException("Failed to load profiles", e)
 
+    profile_symlinks = {k: v for k, v in profile_symlinks.items() if v in (x[0] for x in virtual_profiles) or v in profiles}
+
+    exec_scripts(None, "predetect")
     config, modes = parse_xrandr_output()
 
     if "--fingerprint" in options:
@@ -644,20 +1170,62 @@ def main(argv):
         output_configuration(config, sys.stdout)
         sys.exit(0)
 
+    if "--skip-options" in options:
+        skip_options = [y[2:] if y[:2] == "--" else y for y in (x.strip() for x in options["--skip-options"].split(","))]
+        for profile in profiles.values():
+            for output in profile["config"].values():
+                output.set_ignored_options(skip_options)
+        for output in config.values():
+            output.set_ignored_options(skip_options)
+
     if "-s" in options:
         options["--save"] = options["-s"]
     if "--save" in options:
-        if options["--save"] in ( x[0] for x in virtual_profiles ):
-            raise AutorandrException("Cannot save current configuration as profile '%s':\nThis configuration name is a reserved virtual configuration." % options["--save"])
+        if options["--save"] in (x[0] for x in virtual_profiles):
+            raise AutorandrException("Cannot save current configuration as profile '%s':\n"
+                                     "This configuration name is a reserved virtual configuration." % options["--save"])
         try:
-            save_configuration(os.path.join(profile_path, options["--save"]), config)
+            profile_folder = os.path.join(profile_path, options["--save"])
+            save_configuration(profile_folder, config)
+            exec_scripts(profile_folder, "postsave", {
+                "CURRENT_PROFILE": options["--save"],
+                "PROFILE_FOLDER": profile_folder,
+                "MONITORS": ":".join(enabled_monitors(config)),
+            })
         except Exception as e:
             raise AutorandrException("Failed to save current configuration as profile '%s'" % (options["--save"],), e)
         print("Saved current configuration as profile '%s'" % options["--save"])
         sys.exit(0)
 
-    if "-h" in options or "--help" in options:
-        exit_help()
+    if "-r" in options:
+        options["--remove"] = options["-r"]
+    if "--remove" in options:
+        if options["--remove"] in (x[0] for x in virtual_profiles):
+            raise AutorandrException("Cannot remove profile '%s':\n"
+                                     "This configuration name is a reserved virtual configuration." % options["--remove"])
+        if options["--remove"] not in profiles.keys():
+            raise AutorandrException("Cannot remove profile '%s':\n"
+                                     "This profile does not exist." % options["--remove"])
+        try:
+            remove = True
+            profile_folder = os.path.join(profile_path, options["--remove"])
+            profile_dirlist = os.listdir(profile_folder)
+            profile_dirlist.remove("config")
+            profile_dirlist.remove("setup")
+            if profile_dirlist:
+                print("Profile folder '%s' contains the following additional files:\n"
+                      "---\n%s\n---" % (options["--remove"], "\n".join(profile_dirlist)))
+                response = input("Do you really want to remove profile '%s'? If so, type 'yes': " % options["--remove"]).strip()
+                if response != "yes":
+                    remove = False
+            if remove is True:
+                shutil.rmtree(profile_folder)
+                print("Removed profile '%s'" % options["--remove"])
+            else:
+                print("Profile '%s' was not removed" % options["--remove"])
+        except Exception as e:
+            raise AutorandrException("Failed to remove profile '%s'" % (options["--remove"],), e)
+        sys.exit(0)
 
     detected_profiles = find_profiles(config, profiles)
     load_profile = False
@@ -666,25 +1234,55 @@ def main(argv):
         options["--load"] = options["-l"]
     if "--load" in options:
         load_profile = options["--load"]
+    elif len(args) == 1:
+        load_profile = args[0]
     else:
+        # Find the active profile(s) first, for the block script (See #42)
+        current_profiles = []
         for profile_name in profiles.keys():
-            if profile_blocked(os.path.join(profile_path, profile_name)):
-                print("%s (blocked)" % profile_name, file=sys.stderr)
+            configs_are_equal = is_equal_configuration(config, profiles[profile_name]["config"])
+            if configs_are_equal:
+                current_profiles.append(profile_name)
+        block_script_metadata = {
+            "CURRENT_PROFILE": "".join(current_profiles[:1]),
+            "CURRENT_PROFILES": ":".join(current_profiles)
+        }
+
+        for profile_name in profiles.keys():
+            if profile_blocked(os.path.join(profile_path, profile_name), block_script_metadata):
+                if "--current" not in options and "--detected" not in options:
+                    print("%s (blocked)" % profile_name)
                 continue
+            props = []
             if profile_name in detected_profiles:
-                print("%s (detected)" % profile_name, file=sys.stderr)
+                props.append("(detected)")
                 if ("-c" in options or "--change" in options) and not load_profile:
                     load_profile = profile_name
+            elif "--detected" in options:
+                continue
+            if profile_name in current_profiles:
+                props.append("(current)")
+            elif "--current" in options:
+                continue
+            if "--current" in options or "--detected" in options:
+                print("%s" % (profile_name, ))
             else:
-                print(profile_name, file=sys.stderr)
+                print("%s%s%s" % (profile_name, " " if props else "", " ".join(props)))
+            if not configs_are_equal and "--debug" in options and profile_name in detected_profiles:
+                print_profile_differences(config, profiles[profile_name]["config"])
 
     if "-d" in options:
         options["--default"] = options["-d"]
-    if not load_profile and "--default" in options:
+    if not load_profile and "--default" in options and ("-c" in options or "--change" in options):
         load_profile = options["--default"]
 
     if load_profile:
-        if load_profile in ( x[0] for x in virtual_profiles ):
+        if load_profile in profile_symlinks:
+            if "--debug" in options:
+                print("'%s' symlinked to '%s'" % (load_profile, profile_symlinks[load_profile]))
+            load_profile = profile_symlinks[load_profile]
+
+        if load_profile in (x[0] for x in virtual_profiles):
             load_config = generate_virtual_profile(config, modes, load_profile)
             scripts_path = os.path.join(profile_path, load_profile)
         else:
@@ -697,24 +1295,45 @@ def main(argv):
             if load_profile in detected_profiles and detected_profiles[0] != load_profile:
                 update_mtime(os.path.join(scripts_path, "config"))
         add_unused_outputs(config, load_config)
-        if load_config == dict(config) and not "-f" in options and not "--force" in options:
+        if load_config == dict(config) and "-f" not in options and "--force" not in options:
             print("Config already loaded", file=sys.stderr)
             sys.exit(0)
+        if "--debug" in options and load_config != dict(config):
+            print("Loading profile '%s'" % load_profile)
+            print_profile_differences(config, load_config)
+
         remove_irrelevant_outputs(config, load_config)
 
         try:
             if "--dry-run" in options:
                 apply_configuration(load_config, config, True)
             else:
-                exec_scripts(scripts_path, "preswitch")
+                script_metadata = {
+                    "CURRENT_PROFILE": load_profile,
+                    "PROFILE_FOLDER": scripts_path,
+                    "MONITORS": ":".join(enabled_monitors(load_config)),
+                }
+                exec_scripts(scripts_path, "preswitch", script_metadata)
+                if "--debug" in options:
+                    print("Going to run:")
+                    apply_configuration(load_config, config, True)
                 apply_configuration(load_config, config, False)
-                exec_scripts(scripts_path, "postswitch")
+                exec_scripts(scripts_path, "postswitch", script_metadata)
+        except AutorandrException as e:
+            raise AutorandrException("Failed to apply profile '%s'" % load_profile, e, e.report_bug)
         except Exception as e:
             raise AutorandrException("Failed to apply profile '%s'" % load_profile, e, True)
 
+        if "--dry-run" not in options and "--debug" in options:
+            new_config, _ = parse_xrandr_output()
+            if not is_equal_configuration(new_config, load_config):
+                print("The configuration change did not go as expected:")
+                print_profile_differences(new_config, load_config)
+
     sys.exit(0)
 
-if __name__ == '__main__':
+
+def exception_handled_main(argv=sys.argv):
     try:
         main(sys.argv)
     except AutorandrException as e:
@@ -725,5 +1344,11 @@ if __name__ == '__main__':
             print("Exception: {0}".format(e.__class__.__name__))
             sys.exit(2)
 
-        print("Unhandled exception ({0}). Please report this as a bug.".format(e), file=sys.stderr)
+        print("Unhandled exception ({0}). Please report this as a bug at "
+              "https://github.com/phillipberndt/autorandr/issues.".format(e),
+              file=sys.stderr)
         raise
+
+
+if __name__ == '__main__':
+    exception_handled_main()