git-check-clean

#!/bin/bash -e
## check for modified content and uncommitted changes

## read input, display help if necessary
if [[ "$@" == *--help* ]]; then
    cat<<EOF
 Check for cleanliness of repository

 This command can be used to check for modified content,
 uncommitted changes and many other things.

 Usage:
    git check-clean [--exit-code] [--unstaged] [--uncommitted]
     [--untracked] [--unmerged] [--ignore-submodules[=<when>]] 

    --exit-code: return an exit code instead of a message
    --unstaged: check for unstaged files
    --uncommitted: check for staged but uncommitted files
    --untracked: check for untracked files
    --unmerged: check for unmerged files
    --ignore-submodules: ignore submodules, optionally specifying
       in when to ignore submodules (see help of git-status), 
       defaults to "all".
    --warn: do not issue an error, but just a warning.
EOF
    exit 0;
elif [[ "$@" == "" || "$@" == "--warn" ]]; then
    unstaged=1
    uncommitted=1
    untracked=1
    unmerged=1
    if [[ "$@" == "--warn" ]]; then
	warn=1
    fi
else
    while test $# -ne 0
    do
	case "$1" in 
	    --exit-code)
		exitcode=1
		;;
	    --unstaged)
		unstaged=1
		;;
	    --uncommitted)
		uncommitted=1
		;;
	    --untracked)
		untracked=1
		;;
	    --unmerged)
		unmerged=1
		;;
	    --ignore-submodules)
		ignoresub="all"
		;;
	    --ignore-submodules=*)
	        ignoresub="${1#--ignore-submodules=}"
		;;
            --warn)
		warn=1
		;;
	    *)
		break
		;;
	    esac
	shift
    done
fi

## from the git mailinglist:
function git
{
    LC_MESSAGES=C command git "$@"
} 
export git

if [[ "$ignoresub" ]]; then
    status=`git status --porcelain --ignore-submodules=$ignoresub`
else
    status=`git status --porcelain`
fi

if [[ $unstaged -eq 1 ]]; then
  if echo "$status" | grep -E '^[ MARC][MD]' -q; then
      if [[ $exitcode -eq 1 ]]; then
	  exit 1;
      else
	  if [[ "$ignoresub" ]] || (git status --porcelain --ignore-submodules) | grep -E '^[ MARC][MD]' -q; then
	      output=" There are unstaged changes. Use \"git add <file>\" to add.
"
	  fi
	  sub=`git ls-files --error-unmatch --stage | grep -E '^160000' | sed -e 's/^.*	//' | tr '\n' ' '`
	  if [[ ! "$ignoresub" && "$sub" ]]; then
	      if (git status --porcelain -- $sub) | grep -E '^[ MARC][MD]' -q; then
		  output="$output There is modified content in submodules.
"
	      fi
	  fi
      fi
  fi
fi

if [[ $unmerged -eq 1 ]]; then
    if echo "$status" | grep -E '^(DD|AU|UD|UA|DU|AU|UU)' -q; then
        if [[ $exitcode -eq 1 ]]; then
	    exit 1;
	else
	    output="$output There are unmerged files. Use \"git add <file>\" when merged.
"
	fi
    fi
fi

if [[ $uncommitted -eq 1 ]]; then
    if echo "$status" | grep -E '^[MADRC]' -q; then
	if [[ $exitcode -eq 1 ]]; then
	    exit 1;
	else
	    output="$output There are uncommitted files. Use \"git rcommit\" or \"git commit\" to commit.
"	
	fi
    fi
fi

if [[ $untracked -eq 1 ]]; then
    if echo "$status" | grep -E '^\?\?' -q; then
	if [[ $exitcode -eq 1 ]]; then
	    exit 1;
	else
	     output="$output There are untracked files not in .gitignore. Try \"make clean\" to remove temporary files.
"
	fi
    fi
fi

if [[ "$output" ]]; then
    if [[ "$warn" ]]; then
	echo >&2 -n "Warning in $PWD: 
$output"
	exit 0
    else
	echo >&2 -n "Error in $PWD:
$output"
	exit 1
    fi
fi