Option -N to use native prompt

This is useful for situations where the executable is compiled with
readline support but the user wants to use the native prompt. Often
this happens because packagers build without readline disabled.

src/nnn.c

@@ -389,7 +389,8 @@ typedef struct {
 	uint_t trash      : 2;  /* Trash method 0: rm -rf, 1: trash-cli, 2: gio trash */
 	uint_t uidgid     : 1;  /* Show owner and group info */
 	uint_t usebsdtar  : 1;  /* Use bsdtar as default archive utility */
-	uint_t reserved   : 5;  /* Adjust when adding/removing a field */
+	uint_t xprompt    : 1;  /* Use native prompt instead of readline prompt */
+	uint_t reserved   : 4;  /* Adjust when adding/removing a field */
 } runstate;
 
 /* Contexts or workspaces */
@@ -5479,7 +5480,7 @@ static bool prompt_run(void)
 
 	while (1) {
 #ifndef NORL
-		if (g_state.picker) {
+		if (g_state.picker || g_state.xprompt) {
 #endif
 			cmdline = xreadline(NULL, PROMPT);
 #ifndef NORL
@@ -7695,7 +7696,7 @@ static bool browse(char *ipath, const char *session, int pkey)
 				break;
 			case SEL_OPENWITH:
 #ifndef NORL
-				if (g_state.picker) {
+				if (g_state.picker || g_state.xprompt) {
 #endif
 					tmp = xreadline(NULL, messages[MSG_OPEN_WITH]);
 #ifndef NORL
@@ -8340,6 +8341,9 @@ static void usage(void)
 		" -K      detect key collision and exit\n"
 		" -l val  set scroll lines\n"
 		" -n      type-to-nav mode\n"
+#ifndef NORL
+		" -N      use native prompt\n"
+#endif
 		" -o      open files only on Enter\n"
 		" -p file selection file [-:stdout]\n"
 		" -P key  run plugin key\n"
@@ -8517,7 +8521,7 @@ int main(int argc, char *argv[])
 
 	while ((opt = (env_opts_id > 0
 		       ? env_opts[--env_opts_id]
-		       : getopt(argc, argv, "aAb:BcCdDeEfF:gHiJKl:nop:P:QrRs:St:T:uUVxh"))) != -1) {
+		       : getopt(argc, argv, "aAb:BcCdDeEfF:gHiJKl:nNop:P:QrRs:St:T:uUVxh"))) != -1) {
 		switch (opt) {
 #ifndef NOFIFO
 		case 'a':
@@ -8590,6 +8594,11 @@ int main(int argc, char *argv[])
 		case 'n':
 			cfg.filtermode = 1;
 			break;
+#ifndef NORL
+		case 'N':
+			g_state.xprompt = 1;
+			break;
+#endif
 		case 'o':
 			cfg.nonavopen = 1;
 			break;
@@ -8965,7 +8974,7 @@ int main(int argc, char *argv[])
 	exitcurses();
 
 #ifndef NORL
-	if (rlhist) {
+	if (rlhist && !g_state.xprompt) {
 		mkpath(cfgpath, ".history", g_buf);
 		write_history(g_buf);
 	}