Bash completion for flags

src/cmd/CMakeLists.txt

@@ -1,4 +1,4 @@
-# Generate a the ruby script.
+# Generate the ruby script.
 # Note that the major version of the library is included in the name.
 if (APPLE)
  set(IGN_LIBRARY_NAME lib${PROJECT_NAME_LOWER}.dylib)
@@ -11,3 +11,6 @@ configure_file(
 
 # Install the ruby command line library in an unversioned location.
 install(FILES ${CMAKE_CURRENT_BINARY_DIR}/cmdgui${PROJECT_VERSION_MAJOR}.rb DESTINATION lib/ruby/ignition)
+
+# Install the bash completion script in an unversioned location.
+install(FILES gui.bash_completion.sh DESTINATION share/ignition/ignition.completion.d)

src/cmd/gui.bash_completion.sh

@@ -0,0 +1,29 @@
+#!/usr/bin/env bash
+
+# bash tab-completion
+
+# This is a per-library function definition, used in conjunction with the
+# top-level entry point in ign-tools.
+
+function _gz_gui
+{
+ if [[ ${COMP_WORDS[COMP_CWORD]} == -* ]]; then
+ # Specify options (-*) word list for this subcommand
+ COMPREPLY=($(compgen -W "
+ -l --list
+ -s --standalone
+ -c --config
+ -v --verbose
+ -h --help
+ --force-version
+ --versions
+ " -- "${COMP_WORDS[COMP_CWORD]}" ))
+ return
+ else
+ # Just use bash default auto-complete, because we never have two
+ # subcommands in the same line. If that is ever needed, change here to
+ # detect subsequent subcommands
+ COMPREPLY=($(compgen -o default -- "${COMP_WORDS[COMP_CWORD]}"))
+ return
+ fi
+}