add a pick quit keybind (#432)

The last time[0] this was discussed, no-one was against it but no-one
was confident in it either and so it was added to nsxiv-extra as a
patch.

But now that enough time has passed, it seems like there's a pretty high
demand for something like this because there's plenty of use-cases that
use nsxiv as a "picker" where it's meant to quickly pick a single file.

And so add this as a convenient default key-bind.

[0]: https://codeberg.org/nsxiv/nsxiv-record/pulls/42

Co-authored-by: eylles <ed.ylles1997@gmail.com>
Co-authored-by: NRK <nrk@disroot.org>
Reviewed-on: https://codeberg.org/nsxiv/nsxiv/pulls/432
Reviewed-by: NRK <nrk@disroot.org>
Co-authored-by: eylles <eylles@noreply.codeberg.org>
Co-committed-by: eylles <eylles@noreply.codeberg.org>

commands.c

@@ -59,6 +59,13 @@ bool cg_quit(arg_t status)
 	return None; /* silence tcc warning */
 }
 
+bool cg_pick_quit(arg_t status)
+{
+	if (options->to_stdout && markcnt == 0)
+		printf("%s%c", files[fileidx].name, options->using_null ? '\0' : '\n');
+	return cg_quit(status);
+}
+
 bool cg_switch_mode(arg_t _)
 {
 	if (mode == MODE_IMAGE) {

commands.h

@@ -12,6 +12,7 @@ bool cg_n_or_last(arg_t);
 bool cg_navigate_marked(arg_t);
 bool cg_prefix_external(arg_t);
 bool cg_quit(arg_t);
+bool cg_pick_quit(arg_t);
 bool cg_reload_image(arg_t);
 bool cg_remove_image(arg_t);
 bool cg_reverse_marks(arg_t);
@@ -57,6 +58,7 @@ bool ct_select(arg_t);
 #define g_navigate_marked { cg_navigate_marked, MODE_ALL }
 #define g_prefix_external { cg_prefix_external, MODE_ALL }
 #define g_quit { cg_quit, MODE_ALL }
+#define g_pick_quit { cg_pick_quit, MODE_ALL }
 #define g_reload_image { cg_reload_image, MODE_ALL }
 #define g_remove_image { cg_remove_image, MODE_ALL }
 #define g_reverse_marks { cg_reverse_marks, MODE_ALL }

config.def.h

@@ -92,6 +92,7 @@ static const KeySym KEYHANDLER_ABORT = XK_Escape;
 static const keymap_t keys[] = {
 	/* modifiers    key               function              argument */
 	{ 0,            XK_q,             g_quit,               0 },
+	{ 0,            XK_Q,             g_pick_quit,          0 },
 	{ 0,            XK_Return,        g_switch_mode,        None },
 	{ 0,            XK_f,             g_toggle_fullscreen,  None },
 	{ 0,            XK_b,             g_toggle_bar,         None },

etc/nsxiv.1

@@ -135,6 +135,10 @@ Prefix the next command with a number (denoted via
 .B q
 Quit nsxiv.
 .TP
+.B Q
+Quit nsxiv, but additionally print the current filename when \-o is active and
+no files have been marked.
+.TP
 .B Return
 Switch to thumbnail mode / open selected image in image mode.
 .TP