blob: 3b699c0d6f2ef7072323cbc5d30e726f22910902 (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
|
#
# Replace the first instance of the first argument string with the second
# argument string in $PWD, and make that the target of the cd builtin. This is
# to emulate a feature of the `cd` builtin in Zsh that I like, but that I think
# should be a separate command rather than overloading `cd`.
#
# $ pwd
# /usr/local/bin
# $ rd local
# $ pwd
# /usr/bin
# $ rd usr opt
# $ pwd
# /opt/bin
#
rd() {
# Check argument count
case $# in
1|2) ;;
*)
printf >&2 \
'rd(): Need a string and optionally a replacement\n'
return 2
;;
esac
# Set the positional parameters to an option terminator and what will
# hopefully end up being the substituted directory name
set -- "$(
# Current path: e.g. /foo/ayy/bar/ayy
cur=$PWD
# Pattern to replace: e.g. ayy
pat=$1
# Text with which to replace pattern: e.g. lmao
# This can be a null string or unset, in order to *remove* the pattern
rep=$2
# /foo/
curtc=${cur%%"$pat"*}
# /bar/ayy
curlc=${cur#*"$pat"}
# /foo/lmao/bar/ayy
new=${curtc}${rep}${curlc}
# Check that a substitution resulted in an actual change and that we
# ended up with a non-null target, or print an error to stderr
if [ "$cur" = "$curtc" ] || [ -z "$new" ] ; then
printf >&2 'rd(): Substitution failed\n'
exit 1
fi
# Print the target with trailing slash to work around newline stripping
printf '%s/' "${new%/}"
)"
# Remove trailing slash
set -- "${1%/}"
# If the subshell printed nothing, return with failure
[ -n "$1" ] || return
# Try to change into the determined directory
command cd -- "$@"
}
|