Wire up both gitk and git-gui in Meson as subprojects. These two
programs should be the last missing pieces for feature compatibility
with our Makefile.

Signed-off-by: Patrick Steinhardt <redacted>
---
 meson.build       | 14 ++++++++++++++
 meson_options.txt |  4 ++++
 2 files changed, 18 insertions(+)

diff --git a/meson.build b/meson.build
index 5dd299b496..edf7b69a00 100644
--- a/meson.build
+++ b/meson.build

@@ -239,7 +239,9 @@ git = find_program('git', dirs: program_path, native: true, required: false)
 sed = find_program('sed', dirs: program_path, native: true)
 shell = find_program('sh', dirs: program_path, native: true)
 tar = find_program('tar', dirs: program_path, native: true)
+tclsh = find_program('tclsh', required: get_option('git_gui'), native: false)
 time = find_program('time', dirs: program_path, required: get_option('benchmarks'))
+wish = find_program('wish', required: get_option('git_gui').enabled() or get_option('gitk').enabled(), native: false)

 # Detect the target shell that is used by Git at runtime. Note that we prefer
 # "/bin/sh" over a PATH-based lookup, which provides a working shell on most

@@ -2207,6 +2209,16 @@ configure_file(
   configuration: build_options_config,
 )

+gitk_option = get_option('gitk').disable_auto_if(not wish.found())

+if gitk_option.allowed()
+  subproject('gitk')
+endif
+
+git_gui_option = get_option('git_gui').disable_auto_if(not tclsh.found() or not wish.found())
+if git_gui_option.allowed()
+  subproject('git-gui')
+endif
+
 # Development environments can be used via `meson devenv -C <builddir>`. This
 # allows you to execute test scripts directly with the built Git version and
 # puts the built version of Git in your PATH.

@@ -2233,6 +2245,8 @@ summary({
   'curl': curl,
   'expat': expat,
   'gettext': intl,
+  'gitk': gitk_option.allowed(),
+  'git-gui': git_gui_option.allowed(),
   'gitweb': gitweb_option.allowed(),
   'iconv': iconv,
   'pcre2': pcre2,

diff --git a/meson_options.txt b/meson_options.txt
index 1668f260a1..8fa330771b 100644
--- a/meson_options.txt
+++ b/meson_options.txt

@@ -41,6 +41,10 @@ option('expat', type: 'feature', value: 'enabled',
   description: 'Build helpers used to push to remotes with the HTTP transport.')
 option('gettext', type: 'feature', value: 'auto',
   description: 'Build translation files.')
+option('gitk', type: 'feature', value: 'auto',
+  description: 'Build the Gitk graphical repository browser. Requires Tcl/Tk.')
+option('git_gui', type: 'feature', value: 'auto',
+  description: 'Build the git-gui graphical user interface for Git. Requires Tcl/Tk.')
 option('gitweb', type: 'feature', value: 'auto',
   description: 'Build Git web interface. Requires Perl.')
 option('iconv', type: 'feature', value: 'auto',

--

2.51.0.261.g7ce5a0a67e.dirty