commit: 9dc4a6c4a383b1214babe14b4b7091ad56840486
Author: Kerin Millar <kfm <AT> plushkava <DOT> net>
AuthorDate: Thu Jun 27 20:36:10 2024 +0000
Commit: Sam James <sam <AT> gentoo <DOT> org>
CommitDate: Fri Jun 28 17:39:27 2024 +0000
URL:
https://gitweb.gentoo.org/proj/gentoo-functions.git/commit/?id=9dc4a6c4
Add the up() function to experimental
As based on the implementation in Maarten Billemont's bashlib library.
Signed-off-by: Kerin Millar <kfm <AT> plushkava.net>
functions/experimental.sh | 28 ++++++++++++++++++++++++++++
1 file changed, 28 insertions(+)
diff --git a/functions/experimental.sh b/functions/experimental.sh
index f577fa7..e02923a 100644
--- a/functions/experimental.sh
+++ b/functions/experimental.sh
@@ -51,3 +51,31 @@ prepend_ts()
prepend_ts
}
+
+#
+# Takes the first parameter as either a relative pathname or an integer
+# referring to a number of iterations. To be recognised as a pathname, the
first
+# four characters must form the special prefix, ".../". It recurses upwards
from
+# the current directory until either the relative pathname is found to exist,
+# the specified number of iterations has occurred, or the root directory is
+# encountered. In the event that the root directory is reached without either
of
+# the first two conditions being satisfied, the return value shall be 1.
+# Otherwise, the value of PWD shall be printed to the standard output.
+#
+up()
+{
+ local i
+
+ i=0
+ while [ "${PWD}" != / ]; do
+ chdir ../
+ case $1 in
+ .../*)
+ test -e "${1#.../}"
+ ;;
+ *)
+ test "$(( i += 1 ))" -eq "$1"
+ esac \
+ && pwd && return
+ done
+}
