panel: add SearchNext/SearchPrev actions for quick search

Add two new panel actions CK_SearchNext and CK_SearchPrev that cycle
through files matching the current quick search pattern, with
wrap-around. These are only active while quick search is running.

By default, SearchNext is bound to Ctrl+S (same key that starts the
search), and SearchPrev has no default binding. Both can be
customized in the [Panel] section of the keymap file.

This approach follows the existing mc convention of using symbolic
action names bound through keymap files, rather than hardcoding keys.

Signed-off-by: Ilia Karpov <iakarpov@edu.hse.ru>
Signed-off-by: ki <karpovilia@gmail.com>

Author: karpovilia

doc/man/mc.1.in

@@ -565,6 +565,18 @@ or
 keys can be used to correct typing mistakes. If C\-s is pressed
 again, the next match is searched for.
 .P
+The
+.I SearchNext
+and
+.I SearchPrev
+panel actions can be used to cycle through files matching the current
+search pattern, wrapping around at the beginning or end of the list.
+By default,
+.I SearchNext
+is bound to C\-s (same as repeating the search).
+.I SearchPrev
+has no default binding but can be configured in the keymap file.
+.P
 If quick search is started with double pressing of C\-s, the previous quick
 search pattern will be used for current search.
 .P

lib/keybind.c

@@ -98,6 +98,8 @@ static name_keymap_t command_names[] = {
     ADD_KEYMAP_NAME (EditUserMenu),
     ADD_KEYMAP_NAME (Search),
     ADD_KEYMAP_NAME (SearchContinue),
+    ADD_KEYMAP_NAME (SearchNext),
+    ADD_KEYMAP_NAME (SearchPrev),
     ADD_KEYMAP_NAME (Replace),
     ADD_KEYMAP_NAME (ReplaceContinue),
     ADD_KEYMAP_NAME (Help),

lib/keybind.h

@@ -80,6 +80,8 @@ enum
     CK_Replace,
     CK_ReplaceContinue,
     CK_SearchStop,
+    CK_SearchNext,
+    CK_SearchPrev,
     CK_Help,
     CK_Edit,
     CK_EditNew,

src/filemanager/panel.c

@@ -3530,11 +3530,81 @@ panel_execute_cmd (WPanel *panel, long command)
 {
     int res = MSG_HANDLED;
 
-    if (command != CK_Search)
+    if (command != CK_Search && command != CK_SearchNext && command != CK_SearchPrev)
         stop_search (panel);
 
     switch (command)
     {
+    case CK_SearchNext:
+    case CK_SearchPrev:
+        if (panel->quick_search.active)
+        {
+            int direction = (command == CK_SearchNext) ? 1 : -1;
+            int start = panel->current + direction;
+            int i, found = -1;
+            gboolean wrapped = FALSE;
+            char *reg_exp, *esc_str;
+            mc_search_t *search;
+
+            if (panel->quick_search.buffer->len == 0)
+                break;
+
+            reg_exp = g_strdup_printf ("%s*", panel->quick_search.buffer->str);
+            esc_str = str_escape (reg_exp, -1, ",|\\{}[]", TRUE);
+            search = mc_search_new (esc_str, NULL);
+            search->search_type = MC_SEARCH_T_GLOB;
+            search->is_entire_line = TRUE;
+
+            switch (panels_options.qsearch_mode)
+            {
+            case QSEARCH_CASE_SENSITIVE:
+                search->is_case_sensitive = TRUE;
+                break;
+            case QSEARCH_CASE_INSENSITIVE:
+                search->is_case_sensitive = FALSE;
+                break;
+            default:
+                search->is_case_sensitive = panel->sort_info.case_sensitive;
+                break;
+            }
+
+            for (i = start; !wrapped || i != start; i += direction)
+            {
+                if (i >= panel->dir.len)
+                {
+                    i = 0;
+                    if (wrapped)
+                        break;
+                    wrapped = TRUE;
+                }
+                if (i < 0)
+                {
+                    i = panel->dir.len - 1;
+                    if (wrapped)
+                        break;
+                    wrapped = TRUE;
+                }
+                if (mc_search_run (search, panel->dir.list[i].fname->str, 0,
+                                   panel->dir.list[i].fname->len, NULL))
+                {
+                    found = i;
+                    break;
+                }
+            }
+
+            mc_search_free (search);
+            g_free (reg_exp);
+            g_free (esc_str);
+
+            if (found >= 0)
+            {
+                unselect_item (panel);
+                panel->current = found;
+                select_item (panel);
+                widget_draw (WIDGET (panel));
+            }
+        }
+        break;
     case CK_Up:
     case CK_Down:
     case CK_Left:

src/keymap.c

@@ -226,6 +226,8 @@ static const global_keymap_ini_t default_panel_keymap[] = {
     { "PageUp", "pgup; alt-v" },
     { "SelectCodepage", "alt-e" },
     { "Search", "ctrl-s; alt-s" },
+    { "SearchNext", "ctrl-s" },
+    { "SearchPrev", "" },
     { "PanelOtherSync", "alt-i" },
     {
         NULL,