X-Git-Url: https://git.donarmstrong.com/?a=blobdiff_plain;f=tags%2Fgsoc_final%2FR%2Fversion.R;fp=tags%2Fgsoc_final%2FR%2Fversion.R;h=184ec2380bfa8944dc73fffcebf8d185bd361172;hb=5101cce1568b46d042316f32c8216e956f76ff65;hp=0000000000000000000000000000000000000000;hpb=1d3c6e2092b87a8e640704ce3ceec4e8ece3859e;p=cran2deb.git

diff --git a/tags/gsoc_final/R/version.R b/tags/gsoc_final/R/version.R
new file mode 100644
index 0000000..184ec23
--- /dev/null
+++ b/tags/gsoc_final/R/version.R
@@ -0,0 +1,92 @@
+version_new <- function(rver,debian_revision=1, debian_epoch=db_get_base_epoch()) {
+    # generate a string representation of the Debian version of an
+    # R version of a package
+    pkgver = rver
+
+    # ``Writing R extensions'' says that the version consists of at least two
+    # non-negative integers, separated by . or -
+    if (!length(grep('^([0-9]+[.-])+[0-9]+$',rver))) {
+        fail('Not a valid R package version',rver)
+    }
+
+    # Debian policy says that an upstream version should start with a digit and
+    # may only contain ASCII alphanumerics and '.+-:~'
+    if (!length(grep('^[0-9][A-Za-z0-9.+:~-]*$',rver))) {
+        fail('R package version',rver
+                  ,'does not obviously translate into a valid Debian version.')
+    }
+
+    # if rver contains a : then the Debian version must also have a colon
+    if (debian_epoch == 0 && length(grep(':',pkgver)))
+        debian_epoch = 1
+
+    # if the epoch is non-zero then include it
+    if (debian_epoch != 0)
+        pkgver = paste(debian_epoch,':',pkgver,sep='')
+
+    # always add the '-1' Debian release; nothing is lost and rarely will R
+    # packages be Debian packages without modification.
+    return(paste(pkgver,'-',debian_revision,sep=''))
+}
+
+version_epoch <- function(pkgver) {
+    # return the Debian epoch of a Debian package version
+    if (!length(grep(':',pkgver)))
+        return(0)
+    return(as.integer(sub('^([0-9]+):.*','\\1',pkgver)))
+}
+# version_epoch . version_new(x,y) = id
+# version_epoch(version_new(x,y)) = base_epoch
+
+version_revision <- function(pkgver) {
+    # return the Debian revision of a Debian package version
+    return(as.integer(sub('.*-([0-9]+)$','\\1',pkgver)))
+}
+# version_revision . version_new(x) = id
+# version_revision(version_new(x)) = 1
+
+version_upstream <- function(pkgver) {
+    # return the upstream version of a Debian package version
+    return(sub('-[0-9]+$','',sub('^[0-9]+:','',pkgver)))
+}
+# version_upstream . version_new = id
+
+version_update <- function(rver, prev_pkgver, prev_success) {
+    # return the next debian package version
+    prev_rver <- version_upstream(prev_pkgver)
+    if (prev_rver == rver) {
+        # increment the Debian revision if the previous build was successful
+        inc = 0
+        if (prev_success) {
+            inc = 1
+        }
+        return(version_new(rver
+                          ,debian_revision = version_revision(prev_pkgver)+inc
+                          ,debian_epoch    = version_epoch(prev_pkgver)
+                          ))
+    }
+    # new release
+    # TODO: implement Debian ordering over version and then autoincrement
+    #       Debian epoch when upstream version does not increment.
+    return(version_new(rver
+                      ,debian_epoch = version_epoch(prev_pkgver)
+                      ))
+}
+
+new_build_version <- function(pkgname) {
+    if (!(pkgname %in% rownames(available))) {
+        bundle <- r_bundle_of(pkgname)
+        if (is.null(bundle)) {
+            fail('tried to discover new version of',pkgname,'but it does not appear to be available')
+        }
+        name <- bundle
+    }
+    db_ver <- db_latest_build_version(pkgname)
+    db_succ <- db_latest_build_status(pkgname)[[1]]
+    latest_r_ver <- available[pkgname,'Version']
+    if (!is.null(db_ver)) {
+        return(version_update(latest_r_ver, db_ver, db_succ))
+    }
+    return(version_new(latest_r_ver))
+}
+