From cc743b7a924d2556b924b80df6682619b0aec010 Mon Sep 17 00:00:00 2001
From: Tom Ryder <tom@sanctum.geek.nz>
Date: Fri, 29 May 2015 14:55:07 +1200
Subject: Add ud() function as cd ../../../.. shortcut

---
 bash/bashrc.d/ud.bash | 41 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 41 insertions(+)
 create mode 100644 bash/bashrc.d/ud.bash

(limited to 'bash/bashrc.d')

diff --git a/bash/bashrc.d/ud.bash b/bash/bashrc.d/ud.bash
new file mode 100644
index 00000000..c83b7c56
--- /dev/null
+++ b/bash/bashrc.d/ud.bash
@@ -0,0 +1,41 @@
+# Shortcut to step up the directory tree with an arbitrary number of steps,
+# like cd .., cd ../.., etc
+ud() {
+
+    # Check and save optional first argument, number of steps upward; default
+    # to 1 if absent
+    local -i steps=${1:-1}
+    if ! ((steps > 0)) ; then
+        printf 'bash: %s: Invalid step count %s\n' "$FUNCNAME" "$1" >&2
+        return 2
+    fi
+
+    # Check and save optional second argument, target directory; default to
+    # $PWD (typical usage case)
+    local dir=${2:-$PWD}
+    if [[ ! -e "$dir" ]] ; then
+        printf 'bash: %s: Target dir %s does not exist\n' "$FUNCNAME" "$2" >&2
+        return 1
+    fi
+
+    # Append /.. to the target the specified number of times
+    local -i i
+    for (( i = 0 ; i < steps ; i++ )) ; do
+        dir=${dir%/}/..
+    done
+
+    # Try to change into it
+    cd -- "$dir"
+}
+
+# Completion is only useful for the second argument
+_ud() {
+    if ((COMP_CWORD == 2)) ; then
+        local word=${COMP_WORDS[COMP_CWORD]}
+        COMPREPLY=( $(compgen -A directory -- "$word" ) )
+    else
+        return 1
+    fi
+}
+complete -F _ud ud
+
-- 
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