Introduce the i3-sensible-{pager,editor,terminal} scripts

The former two provide fallbacks in case $PAGER or $EDITOR is not set (which
might be more common than you think, because they have to be set in
~/.xsession, not in the shell configuration!) while the latter tries to launch
a terminal emulator. The scripts are most prominently used in i3-nagbar, which
alerts the user when the configuration is broken for some reason. Also,
i3-sensible-terminal is used in the default configuration.

This commit does not rely on the shell supporting ${PAGER:-less} anymore, which
is not the case for 'fish'.

1 files changed, 15 insertions, 0 deletions

diff --git a/i3-sensible-pager b/i3-sensible-pager
new file mode 100755
index 00000000..5af8d6b4
--- /dev/null
+++ b/i3-sensible-pager
@@ -0,0 +1,15 @@
+#!/bin/sh
+# This script tries to exec a pager by trying some known pagers if $PAGER is
+# not set.
+#
+# Distributions/packagers can enhance this script with a
+# distribution-specific mechanism to find the preferred pager.
+which $PAGER >/dev/null && exec $PAGER "$@"
+
+# Hopefully one of these is installed:
+which most >/dev/null && exec most "$@"
+which less >/dev/null && exec less "$@"
+# we don't use 'more' because it will exit if the file is 'too short'
+
+# If no pager is installed, try an editor
+exec i3-sensible-editor "$@"