shell-completion/*/lsmod: add bash/fish/zsh completion

Note that completions are explicitly aimed to be simple, depending on as
little as possible shell specific helpers.

The goal is that people unfamiliar with these can extend them with zero
ramp-up. Doing things efficiently or "properly" is somewhat secondary.

v2:
 - wire the completions to the autotools build

v3:
 - use SPDX style copyright statements

Signed-off-by: Emil Velikov <emil.l.velikov@gmail.com>
Link: https://github.com/kmod-project/kmod/pull/138
Signed-off-by: Lucas De Marchi <lucas.de.marchi@gmail.com>

Makefile.am

@@ -125,7 +125,16 @@ noarch_pkgconfig_DATA = tools/kmod.pc
 
 bashcompletiondir=@bashcompletiondir@
 dist_bashcompletion_DATA = \
-	shell-completion/bash/kmod
+	shell-completion/bash/kmod \
+	shell-completion/bash/lsmod
+
+fishcompletiondir=@fishcompletiondir@
+dist_fishcompletion_DATA = \
+	shell-completion/fish/lsmod.fish
+
+zshcompletiondir=@zshcompletiondir@
+dist_zshcompletion_DATA = \
+	shell-completion/zsh/_lsmod
 
 install-exec-hook:
 if BUILD_TOOLS
@@ -338,7 +347,9 @@ EXTRA_DIST += testsuite/rootfs-pristine
 
 AM_DISTCHECK_CONFIGURE_FLAGS=--enable-gtk-doc --sysconfdir=/etc \
 	--with-zlib --with-zstd --with-xz --with-openssl \
-	--with-bashcompletiondir=$$dc_install_base/$(bashcompletiondir)
+	--with-bashcompletiondir=$$dc_install_base/$(bashcompletiondir) \
+	--with-fishcompletiondir=$$dc_install_base/$(fishcompletiondir) \
+	--with-zshcompletiondir=$$dc_install_base/$(zshcompletiondir)
 
 distclean-local: $(DISTCLEAN_LOCAL_HOOKS)
 

configure.ac

@@ -163,6 +163,22 @@ AC_ARG_WITH([bashcompletiondir],
 	])])
 AC_SUBST([bashcompletiondir], [$with_bashcompletiondir])
 
+AC_ARG_WITH([fishcompletiondir],
+	AS_HELP_STRING([--with-fishcompletiondir=DIR], [Fish completions directory]),
+	[],
+	[AS_IF([$($PKG_CONFIG --exists fish)], [
+		with_fishcompletiondir=$($PKG_CONFIG --variable=completionsdir fish)
+	] , [
+		with_fishcompletiondir=${datadir}/fish/vendor_functions.d
+	])])
+AC_SUBST([fishcompletiondir], [$with_fishcompletiondir])
+
+AC_ARG_WITH([zshcompletiondir],
+	AS_HELP_STRING([--with-zshcompletiondir=DIR], [Zsh completions directory]),
+	[],
+	[with_zshcompletiondir=${datadir}/zsh/site-functions])
+AC_SUBST([zshcompletiondir], [$with_zshcompletiondir])
+
 #####################################################################
 # --enable-
 #####################################################################

meson.build

@@ -191,16 +191,45 @@ if moduledir == ''
 endif
 cdata.set_quoted('MODULE_DIRECTORY', moduledir)
 
-bashcompletiondir = get_option('bashcompletiondir')
-if bashcompletiondir == ''
-  bashcompletion = dependency('bash-completion', required : false)
-  if bashcompletion.found()
-    bashcompletiondir = bashcompletion.get_variable(pkgconfig : 'completionsdir')
-  else
-    bashcompletiondir = join_paths(get_option('prefix'), get_option('datadir'),
-                                   'bash-completion/completions')
+_completiondirs = [
+  ['bashcompletiondir', 'bash-completion', 'bash-completion/completions', 'shell-completion/bash/@0@'],
+  ['fishcompletiondir', 'fish',            'fish/vendor_functions.d',     'shell-completion/fish/@0@.fish'],
+  ['zshcompletiondir',  '',                'zsh/site-functions',          'shell-completion/zsh/_@0@'],
+]
+
+foreach tuple : _completiondirs
+  dir_option = tuple[0]
+  pkg_dep = tuple[1]
+  def_path = tuple[2]
+  ins_path = tuple[3]
+
+  completiondir = get_option(dir_option)
+  if completiondir == ''
+    completion = dependency(pkg_dep, required : false)
+    if completion.found()
+      completiondir = completion.get_variable(pkgconfig : 'completionsdir')
+    else
+      completiondir = join_paths(get_option('prefix'), get_option('datadir'),
+                                 def_path)
+    endif
   endif
-endif
+
+  _completions = [
+    'lsmod',
+  ]
+
+  if completiondir != 'no'
+    foreach comp : _completions
+      install_data(
+        files(ins_path.format(comp)),
+        install_dir : completiondir,
+      )
+    endforeach
+  endif
+
+  # NEEDED solely for bash/kmod below
+  set_variable(dir_option, completiondir)
+endforeach
 
 if bashcompletiondir != 'no'
   install_data(

meson_options.txt

@@ -18,6 +18,18 @@ option(
   description : 'Bash completions directory. Use "no" to disable.',
 )
 
+option(
+  'fishcompletiondir',
+  type : 'string',
+  description : 'Fish completions directory. Use "no" to disable.',
+)
+
+option(
+  'zshcompletiondir',
+  type : 'string',
+  description : 'Zsh completions directory. Use "no" to disable.',
+)
+
 # Compression options
 option(
   'zstd',

shell-completion/bash/lsmod

@@ -0,0 +1,30 @@
+# lsmod(8) completion                                       -*- shell-script -*-
+# SPDX-License-Identifier: LGPL-2.1-or-later
+#
+# SPDX-FileCopyrightText: 2024 Emil Velikov <emil.l.velikov@gmail.com>
+#
+# Formatted using:
+# shfmt --language-dialect bash --indent 4 --func-next-line
+
+_lsmod()
+{
+    # long/short opt pairs
+    local -A opts=(
+        ['syslog']='s'
+        ['verbose']='v'
+        ['version']='V'
+        ['help']='h'
+    )
+
+    local cur="${COMP_WORDS[COMP_CWORD]}"
+
+    if [[ $cur == --* ]]; then
+        COMPREPLY=($(compgen -P '--' -W "${!opts[*]}" -- "${cur:2}"))
+    elif [[ $cur == -* ]]; then
+        if (( ${#cur} != 2 )); then
+            COMPREPLY=($(compgen -P '--' -W "${!opts[*]}" -- "${cur:2}"))
+        fi
+        COMPREPLY+=($(compgen -P '-' -W "${opts[*]}" -- "${cur:1}"))
+    fi
+} &&
+    complete -F _lsmod lsmod

shell-completion/fish/lsmod.fish

@@ -0,0 +1,12 @@
+# lsmod(8) completion                                       -*- shell-script -*-
+# SPDX-License-Identifier: LGPL-2.1-or-later
+#
+# SPDX-FileCopyrightText: 2024 Emil Velikov <emil.l.velikov@gmail.com>
+
+# globally disable file completions
+complete -c lsmod -f
+
+complete -c lsmod -s s -l syslog  -d 'print to syslog, not stderr'
+complete -c lsmod -s v -l verbose -d 'enables more messages'
+complete -c lsmod -s V -l version -d 'show version'
+complete -c lsmod -s h -l help    -d 'show this help'

shell-completion/zsh/_lsmod

@@ -0,0 +1,12 @@
+#compdef lsmod
+
+# lsmod(8) completion                                       -*- shell-script -*-
+# SPDX-License-Identifier: LGPL-2.1-or-later
+#
+# SPDX-FileCopyrightText: 2024 Emil Velikov <emil.l.velikov@gmail.com>
+
+_arguments \
+    {-s,--syslog}'[print to syslog, not stderr]' \
+    {-v,--verbose}'[enables more messages]' \
+    {-V,--version}'[show version]' \
+    {-h,--help}'[show this help]'