Support screen locking on Linux

README.md

@@ -242,6 +242,7 @@ optional arguments:
              ^Y | Toggle multi-copy mode
              ^T | Toggle path quote
              ^L | Redraw, clear prompt
+              L | Lock terminal (on Linux)
               ? | Help, settings
           Q, ^G | Quit and cd
           q, ^X | Quit

nnn.1

@@ -112,6 +112,8 @@ Toggle multiple file path copy mode
 Toggle path quote
 .It Ic ^L
 Force a redraw, clear rename or filter prompt
+.It Ic L
+Lock terminal (Linux only)
 .It Ic \&?
 Toggle help and settings screen
 .It Ic Q, ^G

nnn.c

@@ -1968,6 +1968,9 @@ show_help(char *path)
 	    "d^Y | Toggle multi-copy mode\n"
 	    "d^T | Toggle path quote\n"
 	    "d^L | Redraw, clear prompt\n"
+#ifdef __linux__
+	     "eL | Lock terminal\n"
+#endif
 	     "e? | Help, settings\n"
 	 "aQ, ^G | Quit and cd\n"
 	 "aq, ^X | Quit\n\n");
@@ -3208,6 +3211,11 @@ nochange:
 			run = xgetenv(env, run);
 			spawn(run, dents[cur].name, NULL, path, F_NORMAL);
 			break;
+#ifdef __linux__
+		case SEL_LOCK:
+			spawn(player, "", "screensaver", NULL, F_NORMAL | F_SIGINT);
+			break;
+#endif
 		case SEL_CDQUIT:
 		{
 			char *tmpfile = "/tmp/nnn";

nnn.h

@@ -44,6 +44,9 @@ enum action {
 	SEL_RUN,
 	SEL_RUNSCRIPT,
 	SEL_RUNARG,
+#ifdef __linux__
+	SEL_LOCK,
+#endif
 	SEL_CDQUIT,
 	SEL_QUIT,
 };
@@ -135,9 +138,9 @@ static struct key bindings[] = {
 	/* Open dir in desktop file manager */
 	{ 'o',            SEL_DFB,       "",     "" },
 	/* List archive */
-	{ 'F',            SEL_LIST,      "-l", "" },
+	{ 'F',            SEL_LIST,      "-l",   "" },
 	/* Extract archive */
-	{ CONTROL('F'),   SEL_EXTRACT,   "-x", "" },
+	{ CONTROL('F'),   SEL_EXTRACT,   "-x",   "" },
 	/* Toggle sort by size */
 	{ 's',            SEL_FSIZE,     "",     "" },
 	/* Sort by total block count including dir contents */
@@ -173,6 +176,10 @@ static struct key bindings[] = {
 	/* Run command with argument */
 	{ 'e',            SEL_RUNARG,    "vi",   "EDITOR" },
 	{ 'p',            SEL_RUNARG,    "less", "PAGER" },
+#ifdef __linux__
+	/* Lock screen */
+	{ 'L',            SEL_LOCK,      "",     "" },
+#endif
 	/* Change dir on quit */
 	{ 'Q',            SEL_CDQUIT,    "",     "" },
 	{ CONTROL('G'),   SEL_CDQUIT,    "",     "" },