Ticket #4704: add about box for mc and move display info there

Signed-off-by: Yury V. Zaytsev <yury@shurup.com>

Author: zyv

src/filemanager/boxes.c

@@ -487,6 +487,64 @@ task_cb (WButton *button, int action)
 /*** public functions ****************************************************************************/
 /* --------------------------------------------------------------------------------------------- */
 
+void
+about_box (void)
+{
+    char *label_cp_display;
+    char *label_cp_source;
+
+    char *version = g_strdup_printf ("Midnight Commander %s", mc_global.mc_version);
+
+    const char *name_cp_display =
+        ((codepage_desc *) g_ptr_array_index (codepages, mc_global.display_codepage))->name;
+
+    const char *name_cp_source = mc_global.source_codepage >= 0
+        ? ((codepage_desc *) g_ptr_array_index (codepages, mc_global.source_codepage))->name
+        : N_ ("No translation");
+
+    label_cp_display =
+        g_strdup_printf ("%s: %s", N_ ("Detected display codepage"), name_cp_display);
+    label_cp_source =
+        g_strdup_printf ("%s: %s", N_ ("Selected source (file I/O) codepage"), name_cp_source);
+
+    quick_widget_t quick_widgets[] = {
+        QUICK_LABEL (version, NULL),
+        QUICK_SEPARATOR (TRUE),
+        QUICK_LABEL (N_ ("Classic terminal file manager inspired by Norton Commander."), NULL),
+        QUICK_SEPARATOR (FALSE),
+        QUICK_LABEL (N_ ("Copyright (C) 1996-2025 the Free Software Foundation"), NULL),
+        QUICK_SEPARATOR (TRUE),
+        QUICK_LABEL (label_cp_display, NULL),
+        QUICK_LABEL (label_cp_source, NULL),
+        QUICK_START_BUTTONS (TRUE, TRUE),
+        QUICK_BUTTON (N_ ("&OK"), B_ENTER, NULL, NULL),
+        QUICK_END,
+    };
+
+    WRect r = { -1, -1, 0, 40 };
+
+    quick_dialog_t qdlg = {
+        .rect = r,
+        .title = N_ ("About"),
+        .help = "[Overview]",
+        .widgets = quick_widgets,
+        .callback = NULL,
+        .mouse_callback = NULL,
+    };
+
+    quick_widgets[0].pos_flags = WPOS_KEEP_TOP | WPOS_CENTER_HORZ;
+    quick_widgets[2].pos_flags = WPOS_KEEP_TOP | WPOS_CENTER_HORZ;
+    quick_widgets[4].pos_flags = WPOS_KEEP_TOP | WPOS_CENTER_HORZ;
+
+    (void) quick_dialog (&qdlg);
+
+    g_free (version);
+    g_free (label_cp_display);
+    g_free (label_cp_source);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
 void
 configure_box (void)
 {
@@ -590,24 +648,10 @@ void
 appearance_box (void)
 {
     const gboolean shadows = mc_global.tty.shadows;
-    char *label_cp_display;
-    char *label_cp_source;
 
     current_skin_name = g_strdup (mc_skin__default.name);
     skin_names = mc_skin_list ();
 
-    const char *name_cp_display =
-        ((codepage_desc *) g_ptr_array_index (codepages, mc_global.display_codepage))->name;
-
-    const char *name_cp_source = mc_global.source_codepage >= 0
-        ? ((codepage_desc *) g_ptr_array_index (codepages, mc_global.source_codepage))->name
-        : N_ ("No translation");
-
-    label_cp_display =
-        g_strdup_printf ("%s: %s", N_ ("Detected display codepage"), name_cp_display);
-    label_cp_source =
-        g_strdup_printf ("%s: %s", N_ ("Selected source (file I/O) codepage"), name_cp_source);
-
     {
         quick_widget_t quick_widgets[] = {
             // clang-format off
@@ -619,9 +663,6 @@ appearance_box (void)
             QUICK_STOP_COLUMNS,
             QUICK_SEPARATOR (TRUE),
             QUICK_CHECKBOX (N_ ("&Shadows"), &mc_global.tty.shadows, &shadows_id),
-            QUICK_SEPARATOR (TRUE),
-            QUICK_LABEL (label_cp_display, NULL),
-            QUICK_LABEL (label_cp_source, NULL),
             QUICK_BUTTONS_OK_CANCEL,
             QUICK_END,
             // clang-format on
@@ -648,8 +689,6 @@ appearance_box (void)
         }
     }
 
-    g_free (label_cp_display);
-    g_free (label_cp_source);
     g_free (current_skin_name);
     g_ptr_array_free (skin_names, TRUE);
 }

src/filemanager/boxes.h

@@ -18,6 +18,7 @@
 
 /*** declarations of public functions ************************************************************/
 
+void about_box (void);
 void configure_box (void);
 void appearance_box (void);
 void panel_options_box (void);

src/filemanager/filemanager.c

@@ -329,6 +329,8 @@ create_options_menu (void)
 #endif
     entries = g_list_prepend (entries, menu_separator_new ());
     entries = g_list_prepend (entries, menu_entry_new (_ ("&Save setup"), CK_SaveSetup));
+    entries = g_list_prepend (entries, menu_separator_new ());
+    entries = g_list_prepend (entries, menu_entry_new (_ ("A&bout..."), CK_About));
 
     return g_list_reverse (entries);
 }
@@ -1107,6 +1109,9 @@ midnight_execute_cmd (Widget *sender, long command)
 
     switch (command)
     {
+    case CK_About:
+        about_box ();
+        break;
     case CK_ChangePanel:
         (void) change_panel ();
         break;