mmcli/cell-broadcast: Add status output

This allows to get the current channel list:

$ mmcli -m any  --cell-broadcast-status
  --------------------------
  Cell Broadcast | channels: 0-9999,4353

cli/mmcli-modem-cell-broadcast.c

@@ -15,7 +15,7 @@
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  *
- * Copyright (C) 2024 Guido Günther <agx@sigxcpu.org>
+ * Copyright (C) 2024-2025 Guido Günther <agx@sigxcpu.org>
  */
 
 #include "config.h"
@@ -51,6 +51,10 @@ static gboolean list_flag;
 static gchar *delete_str;
 
 static GOptionEntry entries[] = {
+    { "cell-broadcast-status", 0, 0, G_OPTION_ARG_NONE, &status_flag,
+      "Show cell broadcast status",
+      NULL
+    },
     { "cell-broadcast-list-cbm", 0, 0, G_OPTION_ARG_NONE, &list_flag,
       "List cell broadcast messages available in a given modem",
       NULL
@@ -86,7 +90,8 @@ mmcli_modem_cell_broadcast_options_enabled (void)
     if (checked)
         return !!n_actions;
 
-    n_actions = (list_flag +
+    n_actions = (status_flag +
+                 list_flag +
                  !!delete_str);
 
     if (n_actions > 1) {
@@ -155,6 +160,21 @@ output_cbm_info (MMCbm *cbm)
     g_free (extra);
 }
 
+static void
+print_cell_broadcast_status (void)
+{
+    g_autofree MMCellBroadcastChannels *channels = NULL;
+    guint channels_len = 0;
+    gchar *str = NULL;
+
+    mm_modem_cell_broadcast_get_channels (ctx->modem_cell_broadcast, &channels, &channels_len);
+    if (channels)
+        str = mm_common_build_channels_string (channels, channels_len);
+
+    mmcli_output_string_take (MMC_F_CELL_BROADCAST_CHANNELS, str);
+    mmcli_output_dump ();
+}
+
 static void
 list_process_reply (GList        *result,
                     const GError *error)
@@ -313,6 +333,13 @@ mmcli_modem_cell_broadcast_run_synchronous (GDBusConnection *connection)
 
     ensure_modem_cell_broadcast ();
 
+    /* Request to get cell broadcst status? */
+    if (status_flag) {
+        g_debug ("Printing cell broadcast status...");
+        print_cell_broadcast_status ();
+        return;
+    }
+
     /* Request to list the CBM? */
     if (list_flag) {
         GList *result;

cli/mmcli-output.c

@@ -50,6 +50,7 @@ static SectionInfo section_infos[] = {
     [MMC_S_MODEM_3GPP_USSD]            = { "3GPP USSD"            },
     [MMC_S_MODEM_3GPP_PROFILE_MANAGER] = { "3GPP profile manager" },
     [MMC_S_MODEM_CDMA]                 = { "CDMA"                 },
+    [MMC_S_MODEM_CELL_BROADCAST]       = { "Cell Broadcast"       },
     [MMC_S_MODEM_SIM]                  = { "SIM"                  },
     [MMC_S_MODEM_BEARER]               = { "Bearer"               },
     [MMC_S_MODEM_TIME]                 = { "Time"                 },
@@ -167,6 +168,7 @@ static FieldInfo field_infos[] = {
     [MMC_F_CDMA_REGISTRATION_CDMA1X]                 = { "modem.cdma.cdma1x-registration-state",            "registration cdma1x",      MMC_S_MODEM_CDMA,                 },
     [MMC_F_CDMA_REGISTRATION_EVDO]                   = { "modem.cdma.evdo-registration-state",              "registration evdo",        MMC_S_MODEM_CDMA,                 },
     [MMC_F_CDMA_ACTIVATION]                          = { "modem.cdma.activation-state",                     "activation",               MMC_S_MODEM_CDMA,                 },
+    [MMC_F_CELL_BROADCAST_CHANNELS]                  = { "modem.cellbroadcast.channels",                    "channels",                 MMC_S_MODEM_CELL_BROADCAST,       },
     [MMC_F_SIM_PATH]                                 = { "modem.generic.sim",                               "primary sim path",         MMC_S_MODEM_SIM,                  },
     [MMC_F_SIM_PRIMARY_SLOT]                         = { "modem.generic.primary-sim-slot",                  NULL,                       MMC_S_MODEM_SIM,                  },
     [MMC_F_SIM_SLOT_PATHS]                           = { "modem.generic.sim-slots",                         "sim slot paths",           MMC_S_MODEM_SIM,                  },

cli/mmcli-output.h

@@ -46,6 +46,7 @@ typedef enum {
     MMC_S_MODEM_3GPP_USSD,
     MMC_S_MODEM_3GPP_PROFILE_MANAGER,
     MMC_S_MODEM_CDMA,
+    MMC_S_MODEM_CELL_BROADCAST,
     MMC_S_MODEM_SIM,
     MMC_S_MODEM_BEARER,
     MMC_S_MODEM_TIME,
@@ -173,6 +174,8 @@ typedef enum {
     MMC_F_CDMA_REGISTRATION_CDMA1X,
     MMC_F_CDMA_REGISTRATION_EVDO,
     MMC_F_CDMA_ACTIVATION,
+    /* CellBroadcast section */
+    MMC_F_CELL_BROADCAST_CHANNELS,
     /* SIM section */
     MMC_F_SIM_PATH,
     MMC_F_SIM_PRIMARY_SLOT,