From a4e4cf23ca984e1fc7633b48f94c1795a5bc7ec8 Mon Sep 17 00:00:00 2001
From: Tom Ryder <tom@sanctum.geek.nz>
Date: Sat, 20 Aug 2016 13:52:55 +1200
Subject: Port pd() to POSIX sh

---
 sh/shrc.d/pd.sh | 37 +++++++++++++++++++++++++++++++++++++
 1 file changed, 37 insertions(+)
 create mode 100644 sh/shrc.d/pd.sh

(limited to 'sh/shrc.d/pd.sh')

diff --git a/sh/shrc.d/pd.sh b/sh/shrc.d/pd.sh
new file mode 100644
index 00000000..c022b1e8
--- /dev/null
+++ b/sh/shrc.d/pd.sh
@@ -0,0 +1,37 @@
+# Attempt to change into the argument's parent directory; This is intended for
+# use when you've got a file path in a variable, or in history, or in Alt+.,
+# and want to quickly move to its containing directory. In the absence of an
+# argument, this just shifts up a directory, i.e. `cd ..`
+pd() {
+
+    # Change the positional parameters from the target to its containing
+    # directory
+    set -- "$(
+
+        # Check argument count
+        if [ "$#" -gt 1 ] ; then
+            printf >&2 'pd(): Too many arguments\n'
+            exit 2
+        fi
+
+        # Figure out target dirname
+        dirname=${1:-..}
+        dirname=${dirname%/}
+        dirname=${dirname%/*}
+
+        # Check we have a target after that
+        if [ -z "$dirname" ] ; then
+            printf >&2 'ud(): Destination construction failed\n'
+            exit 1
+        fi
+
+        # Print the target
+        printf '%s\n' "$dirname"
+    )"
+
+    # If the subshell printed nothing, return with failure
+    [ -n "$1" ] || return
+
+    # Try to change into the determined directory
+    command cd -- "$@"
+}
-- 
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