Oh yeah, competion time.

completion/zsh/_luacomp

@@ -0,0 +1,24 @@
+#compdef luacomp
+
+_luacomp() {
+  local -a options=(
+    {-h,--help}"[Show this help message and exit]"
+    {-O,--output}"[Output file]: :_files"
+    {-m,--minifier}"[Sets the postprocessor (default\: none)]: :( ${(f)'luacomp --post-processors'} )"
+    {-x,--executable}"[Makes the script an executable (default\: current lua version)]: :_path_commands"
+    "--generator-code[Outputs only the code from the generator]"
+    "--verbose[Verbose output]"
+    "--post-processors[Lists postprocessors]"
+    "--directives[Lists directives]"
+    {-v,--version}"[Prints the version and exits]"
+    "--completion[Output a shell completion script for the specified shell]: :(bash zsh fish)"
+  )
+  _arguments -s -S \
+    $options \
+    ": :_files" \
+    && return 0
+
+  return 1
+}
+
+_luacomp

src/application.lua

@@ -22,12 +22,31 @@ parser:option("-m --minifier", "Sets the postprocessor", "none")
 parser:option("-x --executable", "Makes the script an executable (default: current lua version)"):args "?"
 parser:flag("--generator-code", "Outputs only the code from the generator.")
 parser:flag("--verbose", "Verbose output. (Debugging)"):action(function() VERBOSE=true end)
-parser:flag("--post-processors", "Lists postprocessors"):action(function() preload_providers() for k, v in pairs(providers) do print(k) end os.exit(0) end)
-parser:flag("--directives", "Lists directives"):action(function() preload_directives() for k, v in pairs(directives) do print(k) end os.exit(0) end)
+parser:flag("--post-processors", "Lists postprocessors"):action(function()
+	preload_providers()
+	local provs = {}
+	for k, v in pairs(providers) do
+		provs[#provs+1] = k
+	end
+	table.sort(provs)
+	print(table.concat(provs, "\n"))
+	os.exit(0)
+end)
+parser:flag("--directives", "Lists directives"):action(function()
+	preload_directives()
+	local dirs = {}
+	for k, v in pairs(directives) do
+		dirs[#dirs+1] = k
+	end
+	table.sort(dirs)
+	print(table.concat(dirs, "\n"))
+	os.exit(0)
+end)
 parser:flag("-v --version", "Prints the version and exits"):action(function()
 	print(LUACOMP_VERSION)
 	os.exit(0)
 end)
+parser:add_complete()
 local args = parser:parse()
 local file = args.input
 _sv("LUACOMP_MINIFIER", args.minifier)