From 6753ee3dad6bc01b8ff1138dbc443e01679de277 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Daniel=20Ekl=C3=B6f?= <daniel@ekloef.se>
Date: Tue, 7 May 2019 20:23:51 +0200
Subject: [PATCH] meson: set project version

Export project version with -DF00BAR_VERSION.

This is by default set to the meson project version.

However, if git is found, and we manage to run 'git describe' and 'git
branch' in the source directory, version is set to the output of that
instead.
---
 doc/meson.build |  1 -
 meson.build     | 26 +++++++++++++++++++++++++-
 2 files changed, 25 insertions(+), 2 deletions(-)

diff --git a/doc/meson.build b/doc/meson.build
index f91e311..76967f8 100644
--- a/doc/meson.build
+++ b/doc/meson.build
@@ -1,4 +1,3 @@
-sh = find_program('sh', native: true)
 scdoc = dependency('scdoc', native: true)
 scdoc_prog = find_program(scdoc.get_pkgconfig_variable('scdoc'), native: true)
 
diff --git a/meson.build b/meson.build
index c4c86a9..cf4fa32 100644
--- a/meson.build
+++ b/meson.build
@@ -1,10 +1,33 @@
 project('f00bar', 'c',
+        version: '1.0.0',
         license: 'MIT',
         meson_version: '>=0.48.0',
         default_options: ['c_std=c11', 'warning_level=1', 'werror=true'])
 
 plugs_as_libs = get_option('core-plugins-as-shared-libraries')
 
+version = '"@0@"'.format(meson.project_version())
+
+sh = find_program('sh', native: true)
+git = find_program('git', required: false, native: true)
+
+if git.found()
+  commit_hash = run_command(
+    [sh.path(), '-c',
+     '@0@ --git-dir=$MESON_SOURCE_ROOT/.git describe --always --tags'.format(
+       git.path())])
+
+  branch = run_command(
+    [sh.path(), '-c',
+     '@0@ --git-dir=$MESON_SOURCE_ROOT/.git rev-parse --abbrev-ref HEAD'.format(
+       git.path())])
+
+  if commit_hash.returncode() == 0 and branch.returncode() == 0
+    version = '"@0@ (" __DATE__ ", branch \'@1@\')"'.format(
+      commit_hash.stdout().strip(), branch.stdout().strip())
+  endif
+endif
+
 # Common dependencies
 cc = meson.get_compiler('c')
 dl = cc.find_library('dl', required : false)
@@ -34,7 +57,8 @@ wlroots = dependency('wlroots', required: get_option('backend-wayland'))
 backend_wayland = wayland_client.found() and wayland_cursor.found() and wlroots.found()
 
 add_project_arguments(
-  ['-D_GNU_SOURCE'] +
+  ['-D_GNU_SOURCE',
+   '-DF00BAR_VERSION=@0@'.format(version)] +
   (backend_x11 ? ['-DENABLE_X11'] : []) +
   (backend_wayland ? ['-DENABLE_WAYLAND'] : []) +
   (plugs_as_libs ? ['-DCORE_PLUGINS_AS_SHARED_LIBRARIES'] : []),