From ebd0eb4fb4790cbf289a0dace00e37fe866c9bf3 Mon Sep 17 00:00:00 2001
From: Nicholas Marriott <nicm@openbsd.org>
Date: Mon, 29 Nov 2010 19:45:58 +0000
Subject: [PATCH] If VISUAL or EDITOR contains "vi", configure mode-keys and
 status-keys to vi.

Based on a diff from martynas@, previously requested by a couple of
other people.
---
 tmux.1 | 16 ++++++++++++++--
 tmux.c | 16 ++++++++++++----
 2 files changed, 26 insertions(+), 6 deletions(-)

diff --git a/tmux.1 b/tmux.1
index f738f166..de5144a5 100644
--- a/tmux.1
+++ b/tmux.1
@@ -1852,7 +1852,12 @@ or right justified.
 .Xc
 Use vi or emacs-style
 key bindings in the status line, for example at the command prompt.
-Defaults to emacs.
+The default is emacs, unless the
+.Ev VISUAL
+or
+.Ev EDITOR
+environment variables are set and contain the string
+.Ql vi .
 .It Ic status-left Ar string
 Display
 .Ar string
@@ -2140,7 +2145,14 @@ Set window modes foreground colour.
 .Op Ic vi | emacs
 .Xc
 Use vi or emacs-style key bindings in copy and choice modes.
-Key bindings default to emacs.
+As with the
+.Ic status-keys
+option, the default is emacs, unless
+.Ev VISUAL
+or
+.Ev EDITOR
+contains
+.Ql vi .
 .Pp
 .It Xo Ic mode-mouse
 .Op Ic on | off
diff --git a/tmux.c b/tmux.c
index 0562da3b..c5793955 100644
--- a/tmux.c
+++ b/tmux.c
@@ -231,13 +231,13 @@ main(int argc, char **argv)
 	struct options	*oo, *so, *wo;
 	struct keylist	*keylist;
 	char		*s, *path, *label, *home, **var;
-	int	 	 opt, flags, quiet = 0;
+	int	 	 opt, flags, quiet, keys;
 
 #ifdef DEBUG
 	malloc_options = (char *) "AFGJPX";
 #endif
 
-	flags = 0;
+	quiet = flags = 0;
 	label = path = NULL;
 	login_shell = (**argv == '-');
 	while ((opt = getopt(argc, argv, "28c:df:lL:qS:uUv")) != -1) {
@@ -359,7 +359,6 @@ main(int argc, char **argv)
 	options_set_number(so, "status-fg", 0);
 	options_set_number(so, "status-interval", 15);
 	options_set_number(so, "status-justify", 0);
-	options_set_number(so, "status-keys", MODEKEY_EMACS);
 	options_set_string(so, "status-left", "[#S]");
 	options_set_number(so, "status-left-attr", 0);
 	options_set_number(so, "status-left-bg", 8);
@@ -400,7 +399,6 @@ main(int argc, char **argv)
 	options_set_number(wo, "mode-attr", 0);
 	options_set_number(wo, "mode-bg", 3);
 	options_set_number(wo, "mode-fg", 0);
-	options_set_number(wo, "mode-keys", MODEKEY_EMACS);
 	options_set_number(wo, "mode-mouse", 0);
 	options_set_number(wo, "monitor-activity", 0);
 	options_set_string(wo, "monitor-content", "%s", "");
@@ -428,6 +426,16 @@ main(int argc, char **argv)
 		options_set_number(wo, "utf8", 0);
 	}
 
+	keys = MODEKEY_EMACS;
+	if ((s = getenv("VISUAL")) != NULL || (s = getenv("EDITOR")) != NULL) {
+		if (strrchr(s, '/') != NULL)
+			s = strrchr(s, '/') + 1;
+		if (strstr(s, "vi") != NULL)
+			keys = MODEKEY_VI;
+	}
+	options_set_number(so, "status-keys", keys);
+	options_set_number(wo, "mode-keys", keys);
+
 	/* Locate the configuration file. */
 	if (cfg_file == NULL) {
 		home = getenv("HOME");