[babl] Fix git-version.h handling

[Øyvind "pippin" Kolås <ok src gnome org>]

commit cff554329e5930f93cab919926833021adc58ad1
Author: Félix Piédallu <felix piedallu me>
Date:   Wed Jul 24 12:58:54 2019 +0200

    Fix git-version.h handling

 babl/git-version.h.in |  3 ++-
 babl/meson.build      | 52 +++++++++++++++++++++------------------------------
 meson.build           | 12 ++++++------
 3 files changed, 29 insertions(+), 38 deletions(-)
---
diff --git a/babl/git-version.h.in b/babl/git-version.h.in
index d517ef7..a9f87e2 100644
--- a/babl/git-version.h.in
+++ b/babl/git-version.h.in
@@ -1,5 +1,6 @@
 #ifndef __GIT_VERSION_H__
 #define __GIT_VERSION_H__
+
 #define BABL_GIT_VERSION "@BABL_GIT_VERSION@"
-#define BABL_GIT_LAST_COMMIT_YEAR "@BABL_GIT_LAST_COMMIT_YEAR@"
+
 #endif /* __GIT_VERSION_H__ */
diff --git a/babl/meson.build b/babl/meson.build
index 0510ebd..b2a2d4e 100644
--- a/babl/meson.build
+++ b/babl/meson.build
@@ -42,40 +42,30 @@ babl_version_h = configure_file(
 # already exists because then we are probably working with a tarball
 # in which case the git-version.h we ship is correct.
 
-if test_bin.found() and git_bin.found()
-  if run_command(
-      [test_bin.path(), '-d', join_paths(meson.source_root(), '.git')]
-    ).returncode() == 0
-    # git repo and git is available
-    git_version = run_command([git_bin.path(), 'describe', '--always']
-      ).stdout().strip()
-    git_last_commit_year = run_command([git_bin.path(), 
-      'log', '-n1', '--date=format:%Y', '--pretty=%cd']
-      ).stdout().strip()
-  endif
-else
-  # Not a git repo so expect git-version.h to exist
-  if test_bin.found() and git_bin.found() and
-    run_command(
-      [test_bin.path(), '-f', 'git-version.h']
-    ).returncode() == 0
-    git_version_h = 'git-version.h'
-  else
-    git_version = 'Unknown, shouldn\'t happen'
-    git_last_commit_year = 0
-  endif
-endif
-if not is_variable('git_version_h')
-  git_conf = configuration_data()
-  git_conf.set('BABL_GIT_VERSION', git_version)
-  git_conf.set('BABL_GIT_LAST_COMMIT_YEAR', git_last_commit_year)
-  git_version_h = configure_file(
-    input:  'git-version.h.in',
+is_git_repo = (
+  test_bin.found() and
+  git_bin.found() and
+  run_command(test_bin, '-d', meson.source_root() / '.git').returncode() == 0
+)
+
+if is_git_repo
+  git_version_h = vcs_tag(
+    input : 'git-version.h.in',
     output: 'git-version.h',
-    configuration: git_conf,
+    replace_string: '@BABL_GIT_VERSION@',
+    command: [ git_bin.path(), 'describe', '--always' ],
   )
-endif
 
+  meson.add_dist_script(
+    [ 'sh', '-c', ' '.join(
+    [ 'cp', git_version_h.full_path(), '${MESON_DIST_ROOT}/babl' ]
+    )]
+  )
+
+else
+  git_version_h = files('git-version.h')
+
+endif
 
 babl_sources = [
   'babl-cache.c',
diff --git a/meson.build b/meson.build
index 983b723..adc5d82 100644
--- a/meson.build
+++ b/meson.build
@@ -183,7 +183,7 @@ if cc.has_argument('-mmmx') and get_option('enable-mmx')
       'Define to 1 if MMX assembly is available.')
 
     # sse assembly
-    if cc.has_argument('-msse') and get_option('enable-sse') 
+    if cc.has_argument('-msse') and get_option('enable-sse')
       if cc.compiles('asm ("movntps %xmm0, 0");')
         add_project_arguments('-msse', language: 'c')
         message('sse assembly available')
@@ -251,7 +251,7 @@ if not platform_win32
 endif
 foreach header: check_headers
   if cc.has_header(header[1])
-    conf.set(header[0], 1, description: 
+    conf.set(header[0], 1, description:
       'Define to 1 if the <@0@> header is available'.format(header[1]))
   endif
 endforeach
@@ -261,12 +261,12 @@ endforeach
 # general
 check_functions = [
   ['HAVE_GETTIMEOFDAY', 'gettimeofday', '<sys/time.h>'],
-  ['HAVE_RINT',         'rint'        , '<math.h>'],  
+  ['HAVE_RINT',         'rint'        , '<math.h>'],
   ['HAVE_SRANDOM',      'srandom'     , '<stdlib.h>'],
 ]
 foreach func: check_functions
   if cc.has_function(func[1], prefix: '#include ' + func[2])
-    conf.set(func[0], 1, description: 
+    conf.set(func[0], 1, description:
       'Define to 1 if the @0@() function is available'.format(func[1]))
   endif
 endforeach
@@ -288,7 +288,7 @@ endif
 if get_option('with-lcms')
   lcms = dependency('lcms2', required: true, native: false)
   if lcms.found()
-    conf.set('HAVE_LCMS', 1, description: 
+    conf.set('HAVE_LCMS', 1, description:
       'Define to 1 if liblcms2 is available')
   endif
 else
@@ -302,7 +302,7 @@ if platform_android
 else
   log = []
 endif
-if platform_win32 
+if platform_win32
   dl = []
 else
   dl = cc.find_library('dl',  required: false)