scripts: accept the path of the gettext commands to run as an argument

Don't assume itstool, msgfmt et al. are just magically on the path.
Normally for commands being processed in build.ninja we'd look up the
program in order to run it. Offer the same guarantee for programs being
passed through an awkward script wrapper.

mesonbuild/scripts/gettext.py

@@ -24,6 +24,9 @@ parser.add_argument('--datadirs', default='')
 parser.add_argument('--langs', default='')
 parser.add_argument('--localedir', default='')
 parser.add_argument('--subdir', default='')
+parser.add_argument('--xgettext', default='xgettext')
+parser.add_argument('--msgmerge', default='msgmerge')
+parser.add_argument('--msginit', default='msginit')
 parser.add_argument('--extra-args', default='')
 
 def read_linguas(src_sub: str) -> T.List[str]:
@@ -42,7 +45,7 @@ def read_linguas(src_sub: str) -> T.List[str]:
         print(f'Could not find file LINGUAS in {src_sub}')
         return []
 
-def run_potgen(src_sub: str, pkgname: str, datadirs: str, args: T.List[str]) -> int:
+def run_potgen(src_sub: str, xgettext: str, pkgname: str, datadirs: str, args: T.List[str]) -> int:
     listfile = os.path.join(src_sub, 'POTFILES.in')
     if not os.path.exists(listfile):
         listfile = os.path.join(src_sub, 'POTFILES')
@@ -55,18 +58,18 @@ def run_potgen(src_sub: str, pkgname: str, datadirs: str, args: T.List[str]) ->
         child_env['GETTEXTDATADIRS'] = datadirs
 
     ofile = os.path.join(src_sub, pkgname + '.pot')
-    return subprocess.call(['xgettext', '--package-name=' + pkgname, '-p', src_sub, '-f', listfile,
+    return subprocess.call([xgettext, '--package-name=' + pkgname, '-p', src_sub, '-f', listfile,
                             '-D', os.environ['MESON_SOURCE_ROOT'], '-k_', '-o', ofile] + args,
                            env=child_env)
 
-def update_po(src_sub: str, pkgname: str, langs: T.List[str]) -> int:
+def update_po(src_sub: str, msgmerge: str, msginit: str, pkgname: str, langs: T.List[str]) -> int:
     potfile = os.path.join(src_sub, pkgname + '.pot')
     for l in langs:
         pofile = os.path.join(src_sub, l + '.po')
         if os.path.exists(pofile):
-            subprocess.check_call(['msgmerge', '-q', '-o', pofile, pofile, potfile])
+            subprocess.check_call([msgmerge, '-q', '-o', pofile, pofile, potfile])
         else:
-            subprocess.check_call(['msginit', '--input', potfile, '--output-file', pofile, '--locale', l, '--no-translator'])
+            subprocess.check_call([msginit, '--input', potfile, '--output-file', pofile, '--locale', l, '--no-translator'])
     return 0
 
 def run(args: T.List[str]) -> int:
@@ -83,11 +86,11 @@ def run(args: T.List[str]) -> int:
         langs = read_linguas(src_sub)
 
     if subcmd == 'pot':
-        return run_potgen(src_sub, options.pkgname, options.datadirs, extra_args)
+        return run_potgen(src_sub, options.xgettext, options.pkgname, options.datadirs, extra_args)
     elif subcmd == 'update_po':
-        if run_potgen(src_sub, options.pkgname, options.datadirs, extra_args) != 0:
+        if run_potgen(src_sub, options.xgettext, options.pkgname, options.datadirs, extra_args) != 0:
             return 1
-        return update_po(src_sub, options.pkgname, langs)
+        return update_po(src_sub, options.msgmerge, options.msginit, options.pkgname, langs)
     else:
         print('Unknown subcommand.')
         return 1

mesonbuild/scripts/itstool.py

@@ -24,11 +24,13 @@ parser.add_argument('command')
 parser.add_argument('--build-dir', default='')
 parser.add_argument('-i', '--input', default='')
 parser.add_argument('-o', '--output', default='')
+parser.add_argument('--itstool', default='itstool')
 parser.add_argument('--its', action='append', default=[])
 parser.add_argument('mo_files', nargs='+')
 
 
-def run_join(build_dir: str, its_files: T.List[str], mo_files: T.List[str], in_fname: str, out_fname: str) -> int:
+def run_join(build_dir: str, itstool: str, its_files: T.List[str], mo_files: T.List[str],
+             in_fname: str, out_fname: str) -> int:
     if not mo_files:
         print('No mo files specified to use for translation.')
         return 1
@@ -53,7 +55,7 @@ def run_join(build_dir: str, its_files: T.List[str], mo_files: T.List[str], in_f
             shutil.copy(mo_file, tmp_mo_fname)
             locale_mo_files.append(tmp_mo_fname)
 
-        cmd = ['itstool']
+        cmd = [itstool]
         if its_files:
             for fname in its_files:
                 cmd.extend(['-i', fname])
@@ -73,6 +75,7 @@ def run(args: T.List[str]) -> int:
 
     if command == 'join':
         return run_join(build_dir,
+                        options.itstool,
                         options.its,
                         options.mo_files,
                         options.input,

mesonbuild/scripts/msgfmthelper.py

@@ -22,6 +22,7 @@ parser.add_argument('input')
 parser.add_argument('output')
 parser.add_argument('type')
 parser.add_argument('podir')
+parser.add_argument('--msgfmt', default='msgfmt')
 parser.add_argument('--datadirs', default='')
 parser.add_argument('args', default=[], metavar='extra msgfmt argument', nargs='*')
 
@@ -32,6 +33,6 @@ def run(args: T.List[str]) -> int:
     if options.datadirs:
         env = os.environ.copy()
         env.update({'GETTEXTDATADIRS': options.datadirs})
-    return subprocess.call(['msgfmt', '--' + options.type, '-d', options.podir,
+    return subprocess.call([options.msgfmt, '--' + options.type, '-d', options.podir,
                             '--template', options.input,  '-o', options.output] + options.args,
                            env=env)