Added handy directory pivot

bash/bashrc/sources/41_pivot-command

@@ -0,0 +1,100 @@
+#!/bin/bash
+# Pivot: The handy diretory switch
+# Examples:
+# /root/a/b/c/d $ swing a k
+# /root/k/b/c/d $ swing k g
+# /root/g/b/c/d $ swing b f
+# /root/g/f/c/d $
+
+function pvt() {
+    ARG1=$1; ARG2=$2; ARG3=$3;
+
+    if [[ -z "$ARG1" ]]; then
+        __func_head "[MODE] PIVOT_DIR LAND_DIR"
+        echo
+        return 1
+    fi
+
+    case "$ARG1" in
+        p)
+            CC='pushd' ;;
+        c)
+            CC='cd' ;;
+        e)
+            CC='echo' ;;
+        *)
+            CC='cd'
+            ARG3=$ARG2
+            ARG2=$ARG1
+            ;;
+    esac
+
+    IFS="/" read -a PWDA <<< "$(pwd)"
+
+    # Begin finding dirs in up-stack
+    MARK=0
+    LISTOF=''
+    UP_STACK=''
+    for i in "${!PWDA[@]}"
+    do
+        DIR=${PWDA[$i]}
+
+        if [[ -n "$DIR" ]]; then
+            LISTOF="$LISTOF\n    $DIR";
+        fi
+
+        if [[ "$DIR" =~ $ARG2 ]]; then
+            MARK=$i
+            continue
+        fi
+
+        if [[ $MARK -ne 0 ]]; then
+            UP_STACK="$UP_STACK/$DIR"
+        fi
+    done
+
+    if [[ $MARK -eq 0 ]]; then
+        echo "No such token in up stack: $ARG3"
+        echo -e $LISTOF;
+        echo
+        return 1
+    fi
+
+    PARENT_DIR='/'
+
+    for (( i=1; i<$MARK; i++ ))
+    do
+        PARENT_DIR="$PARENT_DIR${PWDA[$i]}/"
+    done
+
+    CAND=()
+    for i in $( find $PARENT_DIR -maxdepth 1 -type d -name "*$ARG3*" )
+    do
+        CAND+=("$i")
+    done
+
+    for i in "${!CAND[@]}"
+    do
+        DIR="${CAND[$i]}"
+        LAND_DIR="$DIR$UP_STACK"
+
+        if [[ -d "$LAND_DIR" ]]; then
+            $CC "$LAND_DIR"
+            return 0
+        fi
+    done
+
+    echo "Error: Cannot land to \"$UP_STACK\" under pivoting parent: \"$PARENT_DIR\""
+    echo "List of possible landings:"
+    for i in $( find $PARENT_DIR -maxdepth 1 -type d )
+    do
+        LAND_DIR="$i$UP_STACK"
+        if [[ -d "$LAND_DIR" ]]; then
+            echo "    "$( basename $i )
+        fi
+    done
+
+    echo
+
+    return 1
+}