#!/bin/sh
#
# This is included in commands that either have to be run from the toplevel
# of the repository, or with GIT_DIR environment variable properly.
# If the GIT_DIR does not look like the right correct git-repository,
# it dies.

# Having this variable in your environment would break scripts because
# you would cause "cd" to be taken to unexpected places.  If you
# like CDPATH, define it for your interactive shell sessions without
# exporting it.
# But we protect ourselves from such a user mistake nevertheless.
unset CDPATH

# Similarly for IFS
unset IFS

git_broken_path_fix () {
        case ":$PATH:" in
        *:$1:*) : ok ;;
        *)
                PATH=$(
                        SANE_TOOL_PATH="$1"
                        IFS=: path= sep=
                        set x $PATH
                        shift
                        for elem
                        do
                                case "$SANE_TOOL_PATH:$elem" in
                                (?*:/bin | ?*:/usr/bin)
                                        path="$path$sep$SANE_TOOL_PATH"
                                        sep=:
                                        SANE_TOOL_PATH=
                                esac
                                path="$path$sep$elem"
                                sep=:
                        done
                        echo "$path"
                )
                ;;
        esac
}

# @@BROKEN_PATH_FIX@@

die () {
        die_with_status 1 "$@"
}

die_with_status () {
        status=$1
        shift
        echo >&2 "$*"
        exit "$status"
}

GIT_QUIET=

say () {
        if test -z "$GIT_QUIET"
        then
                printf '%s\n' "$*"
        fi
}

if test -n "$OPTIONS_SPEC"; then
        usage() {
                "$0" -h
                exit 1
        }

        parseopt_extra=
        [ -n "$OPTIONS_KEEPDASHDASH" ] &&
                parseopt_extra="--keep-dashdash"

        eval "$(
                echo "$OPTIONS_SPEC" |
                        git rev-parse --parseopt $parseopt_extra -- "$@" ||
                echo exit $?
        )"
else
        dashless=$(basename "$0" | sed -e 's/-/ /')
        usage() {
                die "Usage: $dashless $USAGE"
        }

        if [ -z "$LONG_USAGE" ]
        then
                LONG_USAGE="Usage: $dashless $USAGE"
        else
                LONG_USAGE="Usage: $dashless $USAGE

$LONG_USAGE"
        fi

        case "$1" in
                -h)
                echo "$LONG_USAGE"
                exit
        esac
fi

set_reflog_action() {
        if [ -z "${GIT_REFLOG_ACTION:+set}" ]
        then
                GIT_REFLOG_ACTION="$*"
                export GIT_REFLOG_ACTION
        fi
}

git_editor() {
        if test -z "${GIT_EDITOR:+set}"
        then
                GIT_EDITOR="$(git var GIT_EDITOR)" || return $?
        fi

        eval "$GIT_EDITOR" '"$@"'
}

git_pager() {
        if test -t 1
        then
                GIT_PAGER=$(git var GIT_PAGER)
        else
                GIT_PAGER=cat
        fi
        : ${LESS=-FRSX}
        export LESS

        eval "$GIT_PAGER" '"$@"'
}

sane_grep () {
        GREP_OPTIONS= LC_ALL=C grep "$@"
}

sane_egrep () {
        GREP_OPTIONS= LC_ALL=C egrep "$@"
}

is_bare_repository () {
        git rev-parse --is-bare-repository
}

cd_to_toplevel () {
        cdup=$(git rev-parse --show-toplevel) &&
        cd "$cdup" || {
                echo >&2 "Cannot chdir to $cdup, the toplevel of the working tree"
                exit 1
        }
}

require_work_tree_exists () {
        if test "z$(git rev-parse --is-bare-repository)" != zfalse
        then
                die "fatal: $0 cannot be used without a working tree."
        fi
}

require_work_tree () {
        test "$(git rev-parse --is-inside-work-tree 2>/dev/null)" = true ||
        die "fatal: $0 cannot be used without a working tree."
}

require_clean_work_tree () {
        git rev-parse --verify HEAD >/dev/null || exit 1
        git update-index -q --ignore-submodules --refresh
        err=0

        if ! git diff-files --quiet --ignore-submodules
        then
                echo >&2 "Cannot $1: You have unstaged changes."
                err=1
        fi

        if ! git diff-index --cached --quiet --ignore-submodules HEAD --
        then
                if [ $err = 0 ]
                then
                    echo >&2 "Cannot $1: Your index contains uncommitted changes."
                else
                    echo >&2 "Additionally, your index contains uncommitted changes."
                fi
                err=1
        fi

        if [ $err = 1 ]
        then
                test -n "$2" && echo >&2 "$2"
                exit 1
        fi
}

get_author_ident_from_commit () {
        pick_author_script='
        /^author /{
                s/'\''/'\''\\'\'\''/g
                h
                s/^author \([^<]*\) <[^>]*> .*$/\1/
                s/.*/GIT_AUTHOR_NAME='\''&'\''/p

                g
                s/^author [^<]* <\([^>]*\)> .*$/\1/
                s/.*/GIT_AUTHOR_EMAIL='\''&'\''/p

                g
                s/^author [^<]* <[^>]*> \(.*\)$/@\1/
                s/.*/GIT_AUTHOR_DATE='\''&'\''/p

                q
        }
        '
        encoding=$(git config i18n.commitencoding || echo UTF-8)
        git show -s --pretty=raw --encoding="$encoding" "$1" -- |
        LANG=C LC_ALL=C sed -ne "$pick_author_script"
}

# Clear repo-local GIT_* environment variables. Useful when switching to
# another repository (e.g. when entering a submodule). See also the env
# list in git_connect()
clear_local_git_env() {
        unset $(git rev-parse --local-env-vars)
}


# Platform specific tweaks to work around some commands
case $(uname -s) in
*MINGW*)
        # Windows has its own (incompatible) sort and find
        sort () {
                /usr/bin/sort "$@"
        }
        find () {
                /usr/bin/find "$@"
        }
        # git sees Windows-style pwd
        pwd () {
                builtin pwd -W
        }
        is_absolute_path () {
                case "$1" in
                [/\\]* | [A-Za-z]:*)
                        return 0 ;;
                esac
                return 1
        }
        ;;
*)
        is_absolute_path () {
                case "$1" in
                /*)
                        return 0 ;;
                esac
                return 1
        }
esac

# Make sure we are in a valid repository of a vintage we understand,
# if we require to be in a git repository.
if test -z "$NONGIT_OK"
then
        GIT_DIR=$(git rev-parse --git-dir) || exit
        if [ -z "$SUBDIRECTORY_OK" ]
        then
                test -z "$(git rev-parse --show-cdup)" || {
                        exit=$?
                        echo >&2 "You need to run this command from the toplevel of the working tree."
                        exit $exit
                }
        fi
        test -n "$GIT_DIR" && GIT_DIR=$(cd "$GIT_DIR" && pwd) || {
                echo >&2 "Unable to determine absolute path of git directory"
                exit 1
        }
        : ${GIT_OBJECT_DIRECTORY="$GIT_DIR/objects"}
fi