Define pd function (parent directory)

1 files changed, 46 insertions, 0 deletions

diff --git a/bash/bashrc.d/pd.bash b/bash/bashrc.d/pd.bash
new file mode 100644
index 00000000..f9fb2ab7
--- /dev/null
+++ b/bash/bashrc.d/pd.bash
@@ -0,0 +1,46 @@
+# Attempt to change into the argument's parent directory; preserve any options
+# and pass them to cd. 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() {
+    local arg
+    local -a opts
+    for arg in "$@" ; do
+        case $arg in
+            --)
+                shift
+                break
+                ;;
+            -*)
+                shift
+                opts=("${opts[@]}" "$arg")
+                ;;
+            *)
+                break
+                ;;
+        esac
+    done
+    if (($#)) ; then
+        case $# in
+            1)
+                target=$1
+                target=${target%/}
+                target=${target%/*}
+                ;;
+            2)
+                printf 'bash: pd: too many arguments\n' >&2
+                return 1
+                ;;
+        esac
+    else
+        target=..
+    fi
+    if [[ $target ]] ; then
+        builtin cd "${opts[@]}" -- "$target"
+    else
+        printf 'bash: pd: error calculating parent directory\n' >&2
+        return 1
+    fi
+}
+