add dired-up-directory bound to ^ to go up on directory in dired buffers

diff from Dante Catalfamo (date [at] lambda [dot] cx) with some minor
style nits and the manpage bits from me.

ok florian@

2 files changed, 41 insertions, 6 deletions

diff --git a/usr.bin/mg/dired.c b/usr.bin/mg/dired.c
index 5cb747c3746..128ed0a31e0 100644
--- a/usr.bin/mg/dired.c
+++ b/usr.bin/mg/dired.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: dired.c,v 1.102 2023/03/08 04:43:11 guenther Exp $	*/
+/*	$OpenBSD: dired.c,v 1.103 2024/06/04 06:48:34 op Exp $	*/
 
 /* This file is in the public domain. */
 
@@ -34,6 +34,7 @@ static int	 d_otherwindow(int, int);
 static int	 d_undel(int, int);
 static int	 d_undelbak(int, int);
 static int	 d_findfile(int, int);
+static int	 d_updirectory(int, int);
 static int	 d_ffotherwindow(int, int);
 static int	 d_expunge(int, int);
 static int	 d_copy(int, int);
@@ -122,6 +123,10 @@ static PF diredcz[] = {
 	d_create_directory	/* + */
 };
 
+static PF diredcaret[] = {
+	d_updirectory /* ^ */
+};
+
 static PF direda[] = {
 	d_filevisitalt,		/* a */
 	rescan,			/* b */
@@ -172,9 +177,9 @@ static struct KEYMAPE (1) d_backpagemap = {
 	}
 };
 
-static struct KEYMAPE (7) diredmap = {
-	7,
-	7,
+static struct KEYMAPE (8) diredmap = {
+	8,
+	8,
 	rescan,
 	{
 		{
@@ -191,6 +196,9 @@ static struct KEYMAPE (7) diredmap = {
 			CCHR('Z'), '+', diredcz, (KEYMAP *) & metamap
 		},
 		{
+			'^', '^', diredcaret, NULL
+		},
+		{
 			'a', 'j', direda, NULL
 		},
 		{
@@ -224,6 +232,7 @@ dired_init(void)
 	funmap_add(d_undel, "dired-unmark", 0);
 	funmap_add(d_undelbak, "dired-unmark-backward", 0);
 	funmap_add(d_killbuffer_cmd, "quit-window", 0);
+	funmap_add(d_updirectory, "dired-up-directory", 0);
 	maps_add((KEYMAP *)&diredmap, "dired");
 	dobindkey(fundamental_map, "dired", "^Xd");
 }
@@ -364,6 +373,28 @@ d_findfile(int f, int n)
 }
 
 int
+d_updirectory(int f, int n)
+{
+	struct buffer	*bp;
+	int		 ret;
+	char		 fname[NFILEN];
+
+	ret = snprintf(fname, sizeof(fname), "%s..", curbp->b_fname);
+	if (ret < 0 || (size_t)ret >= sizeof(fname))
+		return (ABORT); /* Name is too long. */
+
+	bp = dired_(fname);
+	if (bp == NULL)
+		return (FALSE);
+	curbp = bp;
+	if (showbuffer(bp, curwp, WFFULL) != TRUE)
+		return (FALSE);
+	if (bp->b_fname[0] != 0)
+		return (TRUE);
+	return (readin(fname));
+}
+
+int
 d_ffotherwindow(int f, int n)
 {
 	char		 fname[NFILEN];
diff --git a/usr.bin/mg/mg.1 b/usr.bin/mg/mg.1
index 4faeb8fb293..ca684157d14 100644
--- a/usr.bin/mg/mg.1
+++ b/usr.bin/mg/mg.1
@@ -1,7 +1,7 @@
-.\"	$OpenBSD: mg.1,v 1.136 2023/10/16 08:33:16 op Exp $
+.\"	$OpenBSD: mg.1,v 1.137 2024/06/04 06:48:34 op Exp $
 .\" This file is in the public domain.
 .\"
-.Dd $Mdocdate: October 16 2023 $
+.Dd $Mdocdate: June 4 2024 $
 .Dt MG 1
 .Os
 .Sh NAME
@@ -1055,6 +1055,8 @@ dired-next-line
 dired-shell-command
 .It +
 dired-create-directory
+.It ^
+dired-up-directory
 .It a
 dired-find-alternate-file
 .It c
@@ -1130,6 +1132,8 @@ Remove the deletion flag for the file on the current line.
 .It Ic dired-unmark-backward
 Remove the deletion flag from the file listed on the previous line
 of the dired buffer, then move up to that line.
+.It Ic dired-up-directory
+Open a dired buffer in the parent directory.
 .It Ic quit-window
 Close the current dired buffer.
 .El