From 50036caa0a39aaa2fef393a20f67d1f9ea35684c Mon Sep 17 00:00:00 2001
From: Joey Hess <joey@kitenet.net>
Date: Mon, 18 Nov 2013 13:53:38 -0400
Subject: use debian/changelog for version

---
 Build/Configure.hs |  6 ++++-
 Build/Version.hs   | 69 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 74 insertions(+), 1 deletion(-)
 create mode 100644 Build/Version.hs

diff --git a/Build/Configure.hs b/Build/Configure.hs
index 0c6245d..967738d 100644
--- a/Build/Configure.hs
+++ b/Build/Configure.hs
@@ -7,11 +7,13 @@ import Control.Applicative
 import Control.Monad.IfElse
 
 import Build.TestConfig
+import Build.Version
 import Git.Version
 
 tests :: [TestCase]
 tests =
-	[ TestCase "git" $ requireCmd "git" "git --version >/dev/null"
+	[ TestCase "version" getVersion
+	, TestCase "git" $ requireCmd "git" "git --version >/dev/null"
 	, TestCase "git version" getGitVersion
 	, TestCase "nice" $ testCmd "nice" "nice true >/dev/null"
 	]
@@ -25,3 +27,5 @@ run ts = do
 	args <- getArgs
 	config <- runTests ts
 	writeSysConfig config
+	whenM (isReleaseBuild) $
+		cabalSetup "github-repair.cabal"
diff --git a/Build/Version.hs b/Build/Version.hs
new file mode 100644
index 0000000..98e0dbf
--- /dev/null
+++ b/Build/Version.hs
@@ -0,0 +1,69 @@
+{- Package version determination, for configure script. -}
+
+module Build.Version where
+
+import Data.Maybe
+import Control.Applicative
+import Data.List
+import System.Environment
+import System.Directory
+import Data.Char
+import System.Process
+
+import Build.TestConfig
+import Utility.Monad
+import Utility.Exception
+
+{- Set when making an official release. (Distribution vendors should set
+ - this too.) -}
+isReleaseBuild :: IO Bool
+isReleaseBuild = isJust <$> catchMaybeIO (getEnv "RELEASE_BUILD")
+
+{- Version is usually based on the major version from the changelog, 
+ - plus the date of the last commit, plus the git rev of that commit.
+ - This works for autobuilds, ad-hoc builds, etc.
+ -
+ - If git or a git repo is not available, or something goes wrong,
+ - or this is a release build, just use the version from the changelog. -}
+getVersion :: Test
+getVersion = do
+	changelogversion <- getChangelogVersion
+	version <- ifM (isReleaseBuild)
+		( return changelogversion
+		, catchDefaultIO changelogversion $ do
+			let major = takeWhile (/= '.') changelogversion
+			autoversion <- readProcess "sh"
+				[ "-c"
+				, "git log -n 1 --format=format:'%ci %h'| sed -e 's/-//g' -e 's/ .* /-g/'"
+				] ""
+			if null autoversion
+				then return changelogversion
+				else return $ concat [ major, ".", autoversion ]
+		)
+	return $ Config "packageversion" (StringConfig version)
+	
+getChangelogVersion :: IO String
+getChangelogVersion = do
+	changelog <- readFile "debian/changelog"
+	let verline = takeWhile (/= '\n') changelog
+	return $ middle (words verline !! 1)
+  where
+	middle = drop 1 . init
+
+{- Set up cabal file with version. -}
+cabalSetup :: FilePath -> IO ()
+cabalSetup cabalfile = do
+	version <- takeWhile (\c -> isDigit c || c == '.')
+		<$> getChangelogVersion
+	cabal <- readFile cabalfile
+	writeFile tmpcabalfile $ unlines $ 
+		map (setfield "Version" version) $
+		lines cabal
+	renameFile tmpcabalfile cabalfile
+  where
+	tmpcabalfile = cabalfile++".tmp"
+	setfield field value s
+		| fullfield `isPrefixOf` s = fullfield ++ value
+		| otherwise = s
+	  where
+		fullfield = field ++ ": "
-- 
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