Implement match clearing and add a keybinding for it

README.md

@@ -165,6 +165,7 @@ Key Binds
     U,⇞           go up a screen
     w             toggle line wrap
     /             search
+    c             clear search matches
     F1            view help
     F2            view recently opened files
 

les.h

@@ -227,6 +227,7 @@ void next_match ();
 void prev_match ();
 void load_search_history ();
 void save_search_history ();
+void clear_matches ();
 
 #endif
 

main.c

@@ -147,6 +147,7 @@ char *usage_text () {
         "    U,⇞           go up a screen\n"
         "    w             toggle line wrap\n"
         "    /             search\n"
+        "    c             clear search matches\n"
         "    F1            view help\n"
         "    F2            view recently opened files\n";
     return str;
@@ -312,6 +313,9 @@ int read_key (char *buf, int len) {
         case '/':
             search();
             break;
+        case 'c':
+            clear_matches();
+            break;
         case -0x40 + 'D':
             move_forward(10000);
             break;

search.c

@@ -191,6 +191,18 @@ void save_search_history () {
     fclose(fp);
 }
 
+void clear_matches () {
+  tabb->matches = NULL;
+  tabb->matches_len = 0;
+  tabb->matches_size = 0;
+  tabb->current_match = 0;
+  tabb->highlights = NULL;
+  tabb->highlights_len = 0;
+  tabb->highlights_size = 0;
+  tabb->highlights_processed = 0;
+  draw_tab();
+}
+
 void search2 (char *pattern) {
     active_search = 0;
     search_version++;