commit 6d392f1a8958a4d6c2393ce5d494c5a119a1039b (patch)
parent 2607280d1f0f8dce4643a768f9bea7d3a451c7cc
Author: Alex Karle <alex@alexkarle.com>
Date: Mon, 23 Aug 2021 22:34:23 -0400
bin: Add t, a small tag-jumping tool for ed(1)
I like to mess around in ed(1) in my free time. I've always thought
adapting to the environment was a fun challenge (although maybe it's
a fools errand). Either way, tag-jumping is incredibly useful for
navigating a new codebase. This new script is a step closer to that!
usage:
$ e
... view code
> !t main
jumping to main.c, search the following:
/^main(volatile int argc, char \*\* volatile argv)$/
> /^main(volatile int argc, char \*\* volatile argv)$/
main(volatile int argc, char ** volatile argv)
... view code
> q
... back where we started!
Diffstat:
| A | bin/t | | | 38 | ++++++++++++++++++++++++++++++++++++++ |
1 file changed, 38 insertions(+), 0 deletions(-)
diff --git a/bin/t b/bin/t
@@ -0,0 +1,38 @@
+#!/bin/sh
+# t -- tag jumping in ed(1)
+#
+# core concept:
+# we simulate a "tag stack" by recursing within ed(1). When you're done
+# at this tag, just `q` out of there!
+#
+# NOTE: unfortunately, we can't get ed(1) to jump to the location within
+# the file (without maybe some crazy hacks like using a fifo for stdin..
+# but even that's likely to fail). The best we can do is output the cmd
+# to search!
+die() {
+ echo "$*" 1>&2
+ exit 1
+}
+
+[ -z "$1" ] && die "usage: t TAG"
+[ ! -e "tags" ] && die "no ./tags file"
+
+TLINE=$(grep "^$1 " tags | head -n 1)
+[ -z "$TLINE" ] && die "tag not found"
+
+file=$(echo "$TLINE" | cut -f2)
+regex=$(echo "$TLINE" | cut -f3)
+
+# trim the universal ctags regex bits
+# also convert it to a real regex by escaping any special chars!
+regex=$(echo "$regex" | sed \
+ -e 's/;"$//' \
+ -e 's/\\/\\\\/g' \
+ -e 's/\*/\\*/g' \
+ -e 's/\[/\\[/g' \
+ -e 's/\]/\\]/g' \
+ -e 's/\./\\./g')
+
+echo "jumping to $file, search the following:"
+echo "$regex"
+exec e "$file"
