Add proper version management

We now have proper sonames in Mac OS X and Linux, proper versioning on
the pkg-config file and proper DLL naming in Windows.

The version of the library is defined exclusively in 'src/git2.h'; the build scripts
read it from there automatically.

Signed-off-by: Vicent Marti <tanoku@gmail.com>

CMakeLists.txt

@@ -14,6 +14,13 @@
 PROJECT(libgit2 C)
 CMAKE_MINIMUM_REQUIRED(VERSION 2.6)
 
+FILE(STRINGS "src/git2.h" GIT2_HEADER REGEX "^#define LIBGIT2_VERSION \"[^\"]*\"$")
+
+STRING(REGEX REPLACE "^.*LIBGIT2_VERSION \"([0-9]+).*$" "\\1" LIBGIT2_VERSION_MAJOR "${GIT2_HEADER}")
+STRING(REGEX REPLACE "^.*LIBGIT2_VERSION \"[0-9]+\\.([0-9]+).*$" "\\1" LIBGIT2_VERSION_MINOR  "${GIT2_HEADER}")
+STRING(REGEX REPLACE "^.*LIBGIT2_VERSION \"[0-9]+\\.[0-9]+\\.([0-9]+).*$" "\\1" LIBGIT2_VERSION_REV "${GIT2_HEADER}")
+SET(LIBGIT2_VERSION_STRING "${LIBGIT2_VERSION_MAJOR}.${LIBGIT2_VERSION_MINOR}.${LIBGIT2_VERSION_REV}")
+
 # Find required dependencies
 FIND_PACKAGE(ZLIB REQUIRED)
 INCLUDE_DIRECTORIES(${ZLIB_INCLUDE_DIR} src)
@@ -80,7 +87,8 @@ ENDIF ()
 # Compile and link libgit2
 ADD_LIBRARY(git2 ${SRC} ${SRC_PLAT} ${SRC_SHA1})
 TARGET_LINK_LIBRARIES(git2 ${ZLIB_LIBRARY} ${LIB_SHA1} ${PTHREAD_LIBRARY} ${SQLITE3_LIBRARIES})
-SET_TARGET_PROPERTIES(git2 PROPERTIES VERSION 0.0.1 SOVERSION 0)
+SET_TARGET_PROPERTIES(git2 PROPERTIES VERSION ${LIBGIT2_VERSION_STRING})
+SET_TARGET_PROPERTIES(git2 PROPERTIES SOVERSION ${LIBGIT2_VERSION_MAJOR})
 
 # Install
 INSTALL(TARGETS git2 

libgit2.pc.in

@@ -5,7 +5,7 @@ includedir=${prefix}/include
 
 Name: libgit2
 Description: The git library, take 2
-Version: 0.0.1
+Version: @version@
 Requires: libcrypto
 Libs: -L${libdir} -lgit2 -lz -lcrypto
 Cflags: -I${includedir}

src/git2.h

@@ -26,6 +26,11 @@
 #ifndef INCLUDE_git_git_h__
 #define INCLUDE_git_git_h__
 
+#define LIBGIT2_VERSION "0.3.0"
+#define LIBGIT2_VER_MAJOR 0
+#define LIBGIT2_VER_MINOR 3
+#define LIBGIT2_VER_REVISION 0
+
 #include "git2/common.h"
 #include "git2/errors.h"
 #include "git2/zlib.h"

wscript

@@ -104,6 +104,19 @@ def build(bld):
         from waflib import Options
         Options.commands = [bld.cmd + '-shared', bld.cmd + '-static'] + Options.commands
 
+def get_libgit2_version(git2_h):
+    import re
+    line = None
+
+    with open(git2_h) as f:
+        line = re.search(r'^#define LIBGIT2_VERSION "(\d\.\d\.\d)"$', f.read(), re.MULTILINE)
+
+    if line is None:
+        raise "Failed to detect libgit2 version"
+
+    return line.group(1)
+
+
 def build_library(bld, build_type):
 
     BUILD = {
@@ -115,6 +128,9 @@ def build_library(bld, build_type):
     directory = bld.path
     sources = directory.ant_glob('src/*.c')
 
+    # Find the version of the library, from our header file
+    version = get_libgit2_version(directory.find_node("src/git2.h").abspath())
+
     # Compile platform-dependant code
     # E.g.  src/unix/*.c
     #       src/win32/*.c
@@ -136,12 +152,13 @@ def build_library(bld, build_type):
         target='git2',
         includes='src',
         install_path='${LIBDIR}',
-        use=ALL_LIBS
+        use=ALL_LIBS,
+        vnum=version,
     )
 
     # On Unix systems, build the Pkg-config entry file
     if bld.env.PLATFORM == 'unix' and bld.is_install:
-        bld(rule="""sed -e 's#@prefix@#${PREFIX}#' -e 's#@libdir@#${LIBDIR}#' < ${SRC} > ${TGT}""",
+        bld(rule="""sed -e 's#@prefix@#${PREFIX}#' -e 's#@libdir@#${LIBDIR}#' -e 's#@version@#%s#' < ${SRC} > ${TGT}""" % version,
             source='libgit2.pc.in',
             target='libgit2.pc',
             install_path='${LIBDIR}/pkgconfig',