diffall.sh - Allows user to run a git diff <TARGET> against all local branches simultaneously.

diffall.sh

#!/bin/bash

function diffall {
  unset MATCH
  unset DIFFALL_TERMINATE
  DIFFALL_TERMINATE=0
  MODIFIED="M"
  WHITESPACE="-w --ignore-blank-lines"
  INCLUDING=""
  EXCLUDING=""
  METHOD="--minimal"
  METHOD_PT=""
  declare -a args
	args=("$*")
	for arg in $args; do
		OPTARG="$(echo "$arg" | sed -E 's/^.*\=(.*)/\1/')"
		case "${arg}" in
				-w|--whitespace) WHITESPACE="-w --ignore-blank-lines"; WHITESPACE_PT="\n   - ignoring white space" ;;
				-W|--show-whitespace) WHITESPACE=""; WHITESPACE_PT="\n   - including white space" ;;
        -m|--modified) MODIFIED="M"; INCLUDING="modified files" ;;
        -M|--not-modified) MODIFIED=""; EXCLUDING="modified files" ;;
        -a|--added) ADDED="A"; [[ "$INCLUDING" != "" ]] && INCLUDING="$INCLUDING,"; INCLUDING="$INCLUDING added files" ;;
        -A|--not-added) ADDED=""; [[ "$EXCLUDING" != "" ]] && EXCLUDING="$EXCLUDING,"; EXCLUDING="$EXCLUDING added files" ;;
        -d|--deleted) DELETED="D"; [[ "$INCLUDING" != "" ]] && INCLUDING="$INCLUDING,"; INCLUDING="$INCLUDING deleted files" ;;
        -D|--not-deleted) DELETED=""; [[ "$EXCLUDING" != "" ]] && EXCLUDING="$EXCLUDING,"; EXCLUDING="$EXCLUDING deleted files" ;;
        -n|--names) METHOD="--name-only"; METHOD_PT="names of branches with " ;;
        -f|--file=*) [[ "$OPTARG" == "" ]] && MATCH="$arg" || MATCH="OPTARG" ;;
        -?|--help)  DIFFALL_TERMINATE=2; diffall_help ;;
				*) if [[ "$*" != "" ]]; then [ ! -f $arg ] && [ ! -d $arg ] && DIFFALL_TERMINATE=1 && echo -e "Unknown option (or invalid target path): $*\n\n script usage: diffall [-wW] [-mM] [-aA] [-dD] [-f] [-?] <path>\n\n" >&2 || MATCH="$arg"; fi ;;
		esac
	done
  
  [[ "$DIFFALL_TERMINATE" == 2 ]] && return 0;

  if [[ "$DIFFALL_TERMINATE" == 1 ]]; then
    echo "Aborting..."
    return 0;
  fi

  
  DIFFLAVORS="${MODIFIED}${ADDED}${DELETED}"
  [[ "$DIFFLAVORS" == "" ]] && echo "All files excluded per call arguments. Aborting..." && return 0;

  READABLE="\n\nDisplaying ${METHOD_PT}differences between $MATCH and all other branches$WHITESPACE_PT"
  [[ "$INCLUDING" != "" ]] && READABLE="$READABLE\n   - including differences from $INCLUDING"; 
  [[ "$EXCLUDING" != "" ]] && READABLE="$READABLE\n   - excluding differences from $EXCLUDING";
  echo -e "$READABLE\n-------------------------------------------------------------------------\n"

  if [[ "$METHOD_PT" == "" ]]; then
    eval "$(git branch -l | sed -E "s%(.*)%echo \"\1 \`git diff --name-status\1 $MATCH 2>1\`\";%g")" | grep " [$DIFFLAVORS]\t" | sed -E "s/ [$DIFFLAVORS]\t.*//g" | xargs -I "%BRANCH%" git --no-pager  diff --src-prefix="================================================ On branch %BRANCH%, found differences in " --dst-prefix="...from current branch, " $METHOD $WHITESPACE %BRANCH% $MATCH
  else
    eval "$(git branch -l | sed -E "s%(.*)%echo \"\1 \`git diff --name-status\1 $MATCH 2>1\`\";%g")" | grep " [$DIFFLAVORS]\t" | sed -E "s/ [$DIFFLAVORS]\t.*//g" | xargs -I %BRANCH% echo "%BRANCH%"

  fi
}


function diffall_help {
  echo -e "

diffall v.0.1a

  Displays differences between the active git branch and ALL OTHER LOCAL BRANCHES. 
  This is useful for when you lose track of which branch contains a specific set of changes.

SYNTAX
  diffall [-wW] [-mM] [-aA] [-dD] [-f] [-?] ./path/to/folder/or/file(s)

ARGUMENTS
  -w / --whitespace       - Ignore Whitespace. Omits branches where the only differences in target are whitespace (spaces and newlines). [[DEFAULT]]
  -W / --show-whitespace  - Include Whitespace. Includes branches where the only differences in target are whitespace (spaces and newlines)
  
  -m / --modified         - Include Modified. Include branches where the target has been modified from the Index. [[DEFAULT]]
  -M / --not-modified     - Exclude Modified. Excludes branches where the target has been modified from the Index.
  
  -a / --added            - Include Added. Includes branches where the target has been added (present there, not in Index)
  -A / --not-added        - Exclude Added. Excludes branches where the target has been added (present there, not in Index) [[DEFAULT]]

  -d / --deleted          - Include Added. Includes branches where the target has been deleted (not present there, is present in Index)
  -D / --not-deleted      - Exclude Added. Excludes branches where the target has been deleted (not present there, is present in Index) [[DEFAULT]]
  
  -n / --names            - Names Only. Omits the actual file diff, displaying only the names of the branches with discrepencies in the target
  
  -f / --file=*           - Specific Find Declaration. OPTIONAL: serves the same purpose of simply specifying the target as the last argument.
                            Dictates the parameter that follows is the target search query. Only really useful for piping this command, or when 
                            the target is being dynamically-generated, or when one cannot control the sequence of arguments

  -? / --help             - Show Help. Displays this helpfile.

USAGE
  Source this file (source /PATH/TO/diffall.sh) then run with syntax as described above.

EXAMPLES
  diffall ./myFile.txt
    Displays all diffs across all local branches for myFile.txt

  diffall -n ./myFile.txt
    Displays the names of all local branches in which myFile.txt differs from the current Index (excluding whitespace)

  diffall -W ./myFile.txt
    Displays the diffs of all local branches in which myFile.txt differs from the current Index (including whitespace)

  diffall -d -M -n ./myFile.txt
    Displays the names of all local branches in which myFile.txt differs or has been deleted from the current Index (excluding whitespace)

  diffall -a ./myFile.txt
    Displays the names of all local branches in which myFile.txt has been added beyond those within the current Index
"
}