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0e22d19a11
In order to enrich information displayed by GApplication command line handling when --help is invoked, 3 new methods are proposed: . g_application_set_option_context_parameter_string . g_application_set_option_context_summary . g_application_set_option_context_description Those methods interact with the GApplication's internal GOptionContext which is created for command line parsing in g_application_parse_command_line. (please refer to the GOptionContext class for more information about option context, parameter string, summary and description.) To illustrate the 3 methods, an example is provided: . gapplication-example-cmdline4.c
86 lines
2.7 KiB
C
86 lines
2.7 KiB
C
#include <gio/gio.h>
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#include <stdlib.h>
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#include <string.h>
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static gint
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handle_local_options (GApplication *application,
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GVariantDict *options,
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gpointer user_data)
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{
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guint32 count;
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/* Deal (locally) with version option */
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if (g_variant_dict_lookup (options, "version", "b", &count))
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{
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g_print ("This is example-cmdline4, version 1.2.3\n");
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return EXIT_SUCCESS;
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}
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return -1;
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}
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static gint
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command_line (GApplication *application,
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GApplicationCommandLine *cmdline,
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gpointer user_data)
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{
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guint32 count;
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GVariantDict *options = g_application_command_line_get_options_dict (cmdline);
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/* Deal with arg option */
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if (g_variant_dict_lookup (options, "flag", "b", &count))
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{
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g_application_command_line_print (cmdline, "flag is set\n");
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}
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return EXIT_SUCCESS;
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}
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int
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main (int argc, char **argv)
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{
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GApplication *app;
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int status;
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GOptionEntry entries[] = {
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/* A version flag option, to be handled locally */
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{ "version", 'v', G_OPTION_FLAG_NONE, G_OPTION_ARG_NONE, NULL, "Show the application version", NULL },
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/* A dummy flag option, to be handled in primary */
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{ "flag", 'f', G_OPTION_FLAG_NONE, G_OPTION_ARG_NONE, NULL, "A flag argument", NULL },
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{ NULL }
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};
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app = g_application_new ("org.gtk.TestApplication",
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G_APPLICATION_HANDLES_COMMAND_LINE);
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g_application_add_main_option_entries (app, entries);
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g_application_set_option_context_parameter_string (app, "- a simple command line example");
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g_application_set_option_context_summary (app,
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"Summary:\n"
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"This is a simple command line --help example.");
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g_application_set_option_context_description (app,
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"Description:\n"
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"This example illustrates the use of "
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"g_application command line --help functionalities "
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"(parameter string, summary, description). "
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"It does nothing at all except displaying information "
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"when invoked with --help argument...\n");
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g_signal_connect (app, "handle-local-options", G_CALLBACK (handle_local_options), NULL);
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g_signal_connect (app, "command-line", G_CALLBACK (command_line), NULL);
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/* This application does absolutely nothing, except if a command line is given */
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status = g_application_run (app, argc, argv);
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g_object_unref (app);
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return status;
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}
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