GIT-VERSION-GEN: rewrite to manage RAINBOWS_VERSION const

This DRYs up versioning and makes packages easier to distribute.

1 files changed, 34 insertions, 35 deletions

diff --git a/GIT-VERSION-GEN b/GIT-VERSION-GEN
index c3becab..c111ce7 100755
--- a/GIT-VERSION-GEN
+++ b/GIT-VERSION-GEN
@@ -1,40 +1,39 @@
-#!/bin/sh
-
-GVF=GIT-VERSION-FILE
-DEF_VER=v4.4.3
-
-LF='
-'
+#!/usr/bin/env ruby
+DEF_VER = "v4.4.3"
+CONSTANT = "Rainbows::Const::RAINBOWS_VERSION"
+RVF = "lib/rainbows/version.rb"
+GVF = "GIT-VERSION-FILE"
+vn = DEF_VER
 
 # First see if there is a version file (included in release tarballs),
 # then try git-describe, then default.
-if test -f version
-then
-        VN=$(cat version) || VN="$DEF_VER"
-elif test -d .git -o -f .git &&
-        VN=$(git describe --abbrev=4 HEAD 2>/dev/null) &&
-        case "$VN" in
-        *$LF*) (exit 1) ;;
-        v[0-9]*)
-                git update-index -q --refresh
-                test -z "$(git diff-index --name-only HEAD --)" ||
-                VN="$VN-dirty" ;;
-        esac
-then
-        VN=$(echo "$VN" | sed -e 's/-/./g');
-else
-        VN="$DEF_VER"
-fi
+if File.exist?(".git")
+  describe = `git describe --abbrev=4 HEAD 2>/dev/null`.strip
+  case describe
+  when /\Av[0-9]*/
+    vn = describe
+    system(*%w(git update-index -q --refresh))
+    unless `git diff-index --name-only HEAD --`.chomp.empty?
+      vn << "-dirty"
+    end
+    vn.tr!('-', '.')
+  end
+end
+
+vn = vn.sub!(/\Av/, "")
+
+# generate the Ruby constant
+new_ruby_version = "#{CONSTANT} = '#{vn}'\n"
+cur_ruby_version = File.read(RVF) rescue nil
+if new_ruby_version != cur_ruby_version
+  File.open(RVF, "w") { |fp| fp.write(new_ruby_version) }
+end
 
-VN=$(expr "$VN" : v*'\(.*\)')
+# generate the makefile snippet
+new_make_version = "GIT_VERSION = #{vn}\n"
+cur_make_version = File.read(GVF) rescue nil
+if new_make_version != cur_make_version
+  File.open(GVF, "w") { |fp| fp.write(new_make_version) }
+end
 
-if test -r $GVF
-then
-        VC=$(sed -e 's/^GIT_VERSION = //' <$GVF)
-else
-        VC=unset
-fi
-test "$VN" = "$VC" || {
-        echo >&2 "GIT_VERSION = $VN"
-        echo "GIT_VERSION = $VN" >$GVF
-}
+puts vn if $0 == __FILE__