build: Merge 'completion' into 'src'

Ever since commit bafbbe81c9, the shell completions are generated
using the Toolbx binary, and the 'completion' sub-directory no longer
has any source code, but only the build scripts to invoke the Toolbx
binary to generate them.  This is a good opportunity to simplify the
layout of this Git repository by reducing the number of sub-directories.

The file containing the Bash completions had to be renamed to avoid
colliding with the name of the Toolbx binary, since they are both
generated in the same sub-directory.

https://github.com/containers/toolbox/pull/1216

completion/meson.build

@@ -1,35 +0,0 @@
-meson_generate_completions_program = find_program('meson_generate_completions.py')
-
-if bashcompletionsdir != ''
-  custom_target(
-    'bash-completion',
-    capture: true,
-    command: [meson_generate_completions_program, meson.global_source_root() / 'src', 'bash'],
-    depends: [toolbox_go],
-    install: true,
-    install_dir: bashcompletionsdir,
-    output: 'toolbox',
-)
-endif
-
-if fishcompletionsdir != ''
-  custom_target(
-    'fish-completion',
-    capture: true,
-    command: [meson_generate_completions_program, meson.global_source_root() / 'src', 'fish'],
-    depends: [toolbox_go],
-    install: true,
-    install_dir: fishcompletionsdir,
-    output: 'toolbox.fish',
-)
-endif
-
-custom_target(
-  'zsh-completion',
-  capture: true,
-  command: [meson_generate_completions_program, meson.global_source_root() / 'src', 'zsh'],
-  depends: [toolbox_go],
-  install: true,
-  install_dir: zshcompletionsdir,
-  output: '_toolbox',
-)

meson.build

@@ -112,6 +112,5 @@ subdir('data')
 subdir('doc')
 subdir('profile.d')
 subdir('src')
-subdir('completion')
 
 meson.add_install_script('meson_post_install.py')

src/meson.build

@@ -1,6 +1,7 @@
 go_build_wrapper_file = files('go-build-wrapper')
 go_build_wrapper_program = find_program('go-build-wrapper')
 
+meson_generate_completions_program = find_program('meson_generate_completions.py')
 meson_go_fmt_program = find_program('meson_go_fmt.py')
 
 sources = files(
@@ -66,6 +67,52 @@ toolbox_go = custom_target(
   output: 'toolbox',
 )
 
+if bashcompletionsdir != ''
+  custom_target(
+    'bash-completion',
+    capture: true,
+    command: [
+      meson_generate_completions_program,
+      meson.current_source_dir(),
+      'bash',
+    ],
+    depends: [toolbox_go],
+    install: true,
+    install_dir: bashcompletionsdir,
+    output: 'toolbox.bash',
+)
+endif
+
+if fishcompletionsdir != ''
+  custom_target(
+    'fish-completion',
+    capture: true,
+    command: [
+      meson_generate_completions_program,
+      meson.current_source_dir(),
+      'fish',
+    ],
+    depends: [toolbox_go],
+    install: true,
+    install_dir: fishcompletionsdir,
+    output: 'toolbox.fish',
+)
+endif
+
+custom_target(
+  'zsh-completion',
+  capture: true,
+  command: [
+    meson_generate_completions_program,
+    meson.current_source_dir(),
+    'zsh',
+  ],
+  depends: [toolbox_go],
+  install: true,
+  install_dir: zshcompletionsdir,
+  output: '_toolbox',
+)
+
 if shellcheck.found()
   test('shellcheck src/go-build-wrapper', shellcheck, args: [go_build_wrapper_file])
 endif