context: rework application options and help output

Group together all options that allow configuring the logging output,
and make them have the same --log-[XXX] prefix.

Also rework the --help output so that all option groups are printed by
default (i.e. there is no longer a --help-all option).

3 files changed, 152 insertions, 60 deletions

diff --git a/src/main.c b/src/main.c
index ada3927c..cb0e923d 100644
--- a/src/main.c
+++ b/src/main.c
@@ -141,8 +141,8 @@ main (int argc, char *argv[])
 
     if (!mm_log_setup (mm_context_get_log_level (),
                        mm_context_get_log_file (),
-                       mm_context_get_timestamps (),
-                       mm_context_get_relative_timestamps (),
+                       mm_context_get_log_timestamps (),
+                       mm_context_get_log_relative_timestamps (),
                        mm_context_get_debug (),
                        &err)) {
         g_warning ("Failed to set up logging: %s", err->message);
diff --git a/src/mm-context.c b/src/mm-context.c
index c00fa544..0a896e6d 100644
--- a/src/mm-context.c
+++ b/src/mm-context.c
@@ -21,36 +21,48 @@
 /*****************************************************************************/
 /* Application context */
 
-static gboolean     version_flag;
-static gboolean     debug;
-static const gchar *log_level;
-static const gchar *log_file;
-static gboolean     show_ts;
-static gboolean     rel_ts;
-
 #if WITH_UDEV
-static gboolean no_auto_scan = FALSE;
+# define NO_AUTO_SCAN_OPTION_FLAG 0
+# define NO_AUTO_SCAN_DEFAULT     FALSE
 #else
-static gboolean no_auto_scan = TRUE;
+/* Keep the option when udev disabled, just so that the unit test setup can
+ * unconditionally use --no-auto-scan */
+# define NO_AUTO_SCAN_OPTION_FLAG G_OPTION_FLAG_HIDDEN
+# define NO_AUTO_SCAN_DEFAULT     TRUE
 #endif
 
+static gboolean     help_flag;
+static gboolean     version_flag;
+static gboolean     debug;
+static gboolean     no_auto_scan = NO_AUTO_SCAN_DEFAULT;
 static const gchar *initial_kernel_events;
 
 static const GOptionEntry entries[] = {
-    { "version", 'V', 0, G_OPTION_ARG_NONE, &version_flag, "Print version", NULL },
-    { "debug", 0, 0, G_OPTION_ARG_NONE, &debug, "Run with extended debugging capabilities", NULL },
-    { "log-level", 0, 0, G_OPTION_ARG_STRING, &log_level, "Log level: one of ERR, WARN, INFO, DEBUG", "[LEVEL]" },
-    { "log-file", 0, 0, G_OPTION_ARG_FILENAME, &log_file, "Path to log file", "[PATH]" },
-    { "timestamps", 0, 0, G_OPTION_ARG_NONE, &show_ts, "Show timestamps in log output", NULL },
-    { "relative-timestamps", 0, 0, G_OPTION_ARG_NONE, &rel_ts, "Use relative timestamps (from MM start)", NULL },
-#if WITH_UDEV
-    { "no-auto-scan", 0, 0, G_OPTION_ARG_NONE, &no_auto_scan, "Don't auto-scan looking for devices", NULL },
-#else
-    /* Keep the option when udev disabled, just so that the unit test setup can
-     * unconditionally use --no-auto-scan */
-    { "no-auto-scan", 0, G_OPTION_FLAG_HIDDEN, G_OPTION_ARG_NONE, &no_auto_scan, NULL, NULL },
-#endif
-    { "initial-kernel-events", 0, 0, G_OPTION_ARG_FILENAME, &initial_kernel_events, "Path to initial kernel events file", "[PATH]" },
+    {
+        "no-auto-scan", 0, NO_AUTO_SCAN_OPTION_FLAG, G_OPTION_ARG_NONE, &no_auto_scan,
+        "Don't auto-scan looking for devices",
+        NULL
+    },
+    {
+        "initial-kernel-events", 0, 0, G_OPTION_ARG_FILENAME, &initial_kernel_events,
+        "Path to initial kernel events file",
+        "[PATH]"
+    },
+    {
+        "debug", 0, 0, G_OPTION_ARG_NONE, &debug,
+        "Run with extended debugging capabilities",
+        NULL
+    },
+    {
+        "version", 'V', 0, G_OPTION_ARG_NONE, &version_flag,
+        "Print version",
+        NULL
+    },
+    {
+        "help", 'h', 0, G_OPTION_ARG_NONE, &help_flag,
+        "Show help",
+        NULL
+    },
     { NULL }
 };
 
@@ -61,52 +73,110 @@ mm_context_get_debug (void)
 }
 
 const gchar *
-mm_context_get_log_level (void)
+mm_context_get_initial_kernel_events (void)
 {
-    return log_level;
+    return initial_kernel_events;
 }
 
-const gchar *
-mm_context_get_log_file (void)
+gboolean
+mm_context_get_no_auto_scan (void)
 {
-    return log_file;
+    return no_auto_scan;
 }
 
-gboolean
-mm_context_get_timestamps (void)
+/*****************************************************************************/
+/* Log context */
+
+static const gchar *log_level;
+static const gchar *log_file;
+static gboolean     log_show_ts;
+static gboolean     log_rel_ts;
+
+static const GOptionEntry log_entries[] = {
+    {
+        "log-level", 0, 0, G_OPTION_ARG_STRING, &log_level,
+        "Log level: one of ERR, WARN, INFO, DEBUG",
+        "[LEVEL]"
+    },
+    {
+        "log-file", 0, 0, G_OPTION_ARG_FILENAME, &log_file,
+        "Path to log file",
+        "[PATH]"
+    },
+    {
+        "log-timestamps", 0, 0, G_OPTION_ARG_NONE, &log_show_ts,
+        "Show timestamps in log output",
+        NULL
+    },
+    {
+        "log-relative-timestamps", 0, 0, G_OPTION_ARG_NONE, &log_rel_ts,
+        "Use relative timestamps (from MM start)",
+        NULL
+    },
+    { NULL }
+};
+
+static GOptionGroup *
+log_get_option_group (void)
 {
-    return show_ts;
+    GOptionGroup *group;
+
+    group = g_option_group_new ("log",
+                                "Logging options",
+                                "Show logging options",
+                                NULL,
+                                NULL);
+    g_option_group_add_entries (group, log_entries);
+    return group;
 }
 
-gboolean
-mm_context_get_relative_timestamps (void)
+const gchar *
+mm_context_get_log_level (void)
 {
-    return rel_ts;
+    return log_level;
 }
 
 const gchar *
-mm_context_get_initial_kernel_events (void)
+mm_context_get_log_file (void)
 {
-    return initial_kernel_events;
+    return log_file;
 }
 
 gboolean
-mm_context_get_no_auto_scan (void)
+mm_context_get_log_timestamps (void)
 {
-    return no_auto_scan;
+    return log_show_ts;
+}
+
+gboolean
+mm_context_get_log_relative_timestamps (void)
+{
+    return log_rel_ts;
 }
 
 /*****************************************************************************/
 /* Test context */
 
-static gboolean test_session;
-static gboolean test_enable;
-static gchar *test_plugin_dir;
+static gboolean  test_session;
+static gboolean  test_enable;
+static gchar    *test_plugin_dir;
 
 static const GOptionEntry test_entries[] = {
-    { "test-session", 0, 0, G_OPTION_ARG_NONE, &test_session, "Run in session DBus", NULL },
-    { "test-enable", 0, 0, G_OPTION_ARG_NONE, &test_enable, "Enable the Test interface in the daemon", NULL },
-    { "test-plugin-dir", 0, 0, G_OPTION_ARG_FILENAME, &test_plugin_dir, "Path to look for plugins", "[PATH]" },
+    {
+        "test-session", 0, 0, G_OPTION_ARG_NONE, &test_session,
+        "Run in session DBus",
+        NULL
+    },
+    {
+        "test-enable", 0, 0, G_OPTION_ARG_NONE, &test_enable,
+        "Enable the Test interface in the daemon",
+        NULL
+    },
+    {
+        "test-plugin-dir", 0, 0, G_OPTION_ARG_FILENAME, &test_plugin_dir,
+        "Path to look for plugins",
+        "[PATH]"
+    },
     { NULL }
 };
 
@@ -149,12 +219,22 @@ print_version (void)
 {
     g_print ("\n"
              "ModemManager " MM_DIST_VERSION "\n"
-             "Copyright (2008 - 2016) The ModemManager authors\n"
+             "Copyright (C) 2008-2017 The ModemManager authors\n"
              "License GPLv2+: GNU GPL version 2 or later <http://gnu.org/licenses/gpl-2.0.html>\n"
              "This is free software: you are free to change and redistribute it.\n"
              "There is NO WARRANTY, to the extent permitted by law.\n"
              "\n");
-    exit (EXIT_SUCCESS);
+}
+
+static void
+print_help (GOptionContext *context)
+{
+    gchar *str;
+
+    /* Always print --help-all */
+    str = g_option_context_get_help (context, FALSE, NULL);
+    g_print ("%s", str);
+    g_free (str);
 }
 
 void
@@ -165,9 +245,11 @@ mm_context_init (gint argc,
     GOptionContext *ctx;
 
     ctx = g_option_context_new (NULL);
-    g_option_context_set_summary (ctx, "DBus system service to communicate with modems.");
+    g_option_context_set_summary (ctx, "DBus system service to control mobile broadband modems.");
     g_option_context_add_main_entries (ctx, entries, NULL);
+    g_option_context_add_group (ctx, log_get_option_group ());
     g_option_context_add_group (ctx, test_get_option_group ());
+    g_option_context_set_help_enabled (ctx, FALSE);
 
     if (!g_option_context_parse (ctx, &argc, &argv, &error)) {
         g_warning ("error: %s", error->message);
@@ -175,19 +257,27 @@ mm_context_init (gint argc,
         exit (1);
     }
 
+    if (version_flag) {
+        print_version ();
+        g_option_context_free (ctx);
+        exit (EXIT_SUCCESS);
+    }
+
+    if (help_flag) {
+        print_help (ctx);
+        g_option_context_free (ctx);
+        exit (EXIT_SUCCESS);
+    }
+
     g_option_context_free (ctx);
 
     /* Additional setup to be done on debug mode */
     if (debug) {
         log_level = "DEBUG";
-        if (!show_ts && !rel_ts)
-            show_ts = TRUE;
+        if (!log_show_ts && !log_rel_ts)
+            log_show_ts = TRUE;
     }
 
-    /* If just version requested, print and exit */
-    if (version_flag)
-        print_version ();
-
     /* Initial kernel events processing may only be used if autoscan is disabled */
 #if WITH_UDEV
     if (!no_auto_scan && initial_kernel_events) {
diff --git a/src/mm-context.h b/src/mm-context.h
index 63a8ec4c..e355692f 100644
--- a/src/mm-context.h
+++ b/src/mm-context.h
@@ -23,17 +23,19 @@
 # define MM_DIST_VERSION VERSION
 #endif
 
-void mm_context_init (gint argc,
+void mm_context_init (gint    argc,
                       gchar **argv);
 
 gboolean     mm_context_get_debug                 (void);
-const gchar *mm_context_get_log_level             (void);
-const gchar *mm_context_get_log_file              (void);
-gboolean     mm_context_get_timestamps            (void);
-gboolean     mm_context_get_relative_timestamps   (void);
 const gchar *mm_context_get_initial_kernel_events (void);
 gboolean     mm_context_get_no_auto_scan          (void);
 
+/* Logging support */
+const gchar *mm_context_get_log_level               (void);
+const gchar *mm_context_get_log_file                (void);
+gboolean     mm_context_get_log_timestamps          (void);
+gboolean     mm_context_get_log_relative_timestamps (void);
+
 /* Testing support */
 gboolean     mm_context_get_test_session    (void);
 gboolean     mm_context_get_test_enable     (void);