ignore files with git

git-ignore.sh

#!/bin/bash

function usage { cat << EOF
usage: git ignore [--global|--local|--repo] PATTERN

ignores PATTERN in git

PATTERN may include wildcard. you may want to quote it:

        # ignores all pdf files that are in the current directory
        git ignore *.pdf

        # ignores ALL pdf files
        git ignore '*.pdf'

OPTIONS

        --repo          writes PATTERN to REPOSITORY/.gitignore (default)
        --local         writes PATTERN to REPOSITORY/.git/info/exclude
        --global        writes PATTERN to $HOME/.config/git/ignore

OTHER OPTIONS

        -h, -?          prints usage help

EOF
}

function ignore {
  local pattern="$1"
  local file="$2"

  echo "$pattern" >> "$file"
}

case "$1" in
  -h|-?)
    usage
    exit 0
    ;;

  --global)
    ignore "$2" "$HOME/.config/git/ignore"
    ;;

  --local)
    ignore "$2" "$(git rev-parse --show-toplevel)/.git/info/exclude"
    ;;

  --repo)
    ignore "$2" "$(git rev-parse --show-toplevel)/.gitignore"
    ;;

  "")
    usage >&2
    exit 1
    ;;

  *)
    ignore "$1" "$(git rev-parse --show-toplevel)/.gitignore"
    ;;
esac