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# stores the divergence from upstream in $p
# used by GIT_PS1_SHOWUPSTREAM
__git_ps1_show_upstream ()
{
local key value
local svn_remote=() svn_url_pattern count n
local upstream=git legacy="" verbose=""

# get some config options from git-config
while read key value; do
case "$key" in
bash.showupstream)
GIT_PS1_SHOWUPSTREAM="$value"
if [[ -z "${GIT_PS1_SHOWUPSTREAM}" ]]; then
p=""
return
fi
;;
svn-remote.*.url)
svn_remote[ $((${#svn_remote[@]} + 1)) ]="$value"
svn_url_pattern+="\\|$value"
upstream=svn+git # default upstream is SVN if available, else git
;;
esac
done < <(git config -z --get-regexp '^(svn-remote\..*\.url|bash\.showupstream)$' 2>/dev/null | tr '\0\n' '\n ')

# parse configuration values
for option in ${GIT_PS1_SHOWUPSTREAM}; do
case "$option" in
git|svn) upstream="$option" ;;
verbose) verbose=1 ;;
legacy) legacy=1 ;;
esac
done

# Find our upstream
case "$upstream" in
git) upstream="@{upstream}" ;;
svn*)
# get the upstream from the "git-svn-id: ..." in a commit message
# (git-svn uses essentially the same procedure internally)
local svn_upstream=($(git log --first-parent -1 \
--grep="^git-svn-id: \(${svn_url_pattern#??}\)" 2>/dev/null))
if [[ 0 -ne ${#svn_upstream[@]} ]]; then
svn_upstream=${svn_upstream[ ${#svn_upstream[@]} - 2 ]}
svn_upstream=${svn_upstream%@*}
local n_stop="${#svn_remote[@]}"
for ((n=1; n <= n_stop; ++n)); do
svn_upstream=${svn_upstream#${svn_remote[$n]}}
done

if [[ -z "$svn_upstream" ]]; then
# default branch name for checkouts with no layout:
upstream=${GIT_SVN_ID:-git-svn}
else
upstream=${svn_upstream#/}
fi
elif [[ "svn+git" = "$upstream" ]]; then
upstream="@{upstream}"
fi
;;
esac

# Find how many commits we are ahead/behind our upstream
if [[ -z "$legacy" ]]; then
count="$(git rev-list --count --left-right \
"$upstream"...HEAD 2>/dev/null)"
else
# produce equivalent output to --count for older versions of git
local commits
if commits="$(git rev-list --left-right "$upstream"...HEAD 2>/dev/null)"
then
local commit behind=0 ahead=0
for commit in $commits
do
case "$commit" in
"<"*) let ++behind
;;
*) let ++ahead
;;
esac
done
count="$behind $ahead"
else
count=""
fi
fi

# calculate the result
if [[ -z "$verbose" ]]; then
case "$count" in
"") # no upstream
p="" ;;
"0 0") # equal to upstream
p="=" ;;
"0 "*) # ahead of upstream
p=">" ;;
*" 0") # behind upstream
p="<" ;;
*) # diverged from upstream
p="<>" ;;
esac
else
case "$count" in
"") # no upstream
p="" ;;
"0 0") # equal to upstream
p=" u=" ;;
"0 "*) # ahead of upstream
p=" u+${count#0 }" ;;
*" 0") # behind upstream
p=" u-${count% 0}" ;;
*) # diverged from upstream
p=" u+${count#* }-${count% *}" ;;
esac
fi

}


# __git_ps1 accepts 0 or 1 arguments (i.e., format string)
# returns text to add to bash PS1 prompt (includes branch name)
__git_ps1 ()
{
local g="$(__gitdir)"
if [ -n "$g" ]; then
local r=""
local b=""
if [ -f "$g/rebase-merge/interactive" ]; then
r="|REBASE-i"
b="$(cat "$g/rebase-merge/head-name")"
elif [ -d "$g/rebase-merge" ]; then
r="|REBASE-m"
b="$(cat "$g/rebase-merge/head-name")"
else
if [ -d "$g/rebase-apply" ]; then
if [ -f "$g/rebase-apply/rebasing" ]; then
r="|REBASE"
elif [ -f "$g/rebase-apply/applying" ]; then
r="|AM"
else
r="|AM/REBASE"
fi
elif [ -f "$g/MERGE_HEAD" ]; then
r="|MERGING"
elif [ -f "$g/CHERRY_PICK_HEAD" ]; then
r="|CHERRY-PICKING"
elif [ -f "$g/BISECT_LOG" ]; then
r="|BISECTING"
fi

b="$(git symbolic-ref HEAD 2>/dev/null)" || {

b="$(
case "${GIT_PS1_DESCRIBE_STYLE-}" in
(contains)
git describe --contains HEAD ;;
(branch)
git describe --contains --all HEAD ;;
(describe)
git describe HEAD ;;
(* | default)
git describe --tags --exact-match HEAD ;;
esac 2>/dev/null)" ||

b="$(cut -c1-7 "$g/HEAD" 2>/dev/null)..." ||
b="unknown"
b="($b)"
}
fi

local w=""
local i=""
local s=""
local u=""
local c=""
local p=""

if [ "true" = "$(git rev-parse --is-inside-git-dir 2>/dev/null)" ]; then
if [ "true" = "$(git rev-parse --is-bare-repository 2>/dev/null)" ]; then
c="BARE:"
else
b="GIT_DIR!"
fi
elif [ "true" = "$(git rev-parse --is-inside-work-tree 2>/dev/null)" ]; then
if [ -n "${GIT_PS1_SHOWDIRTYSTATE-}" ]; then
if [ "$(git config --bool bash.showDirtyState)" != "false" ]; then
git diff --no-ext-diff --quiet --exit-code || w="*"
if git rev-parse --quiet --verify HEAD >/dev/null; then
git diff-index --cached --quiet HEAD -- || i="+"
else
i="#"
fi
fi
fi
if [ -n "${GIT_PS1_SHOWSTASHSTATE-}" ]; then
git rev-parse --verify refs/stash >/dev/null 2>&1 && s="$"
fi

if [ -n "${GIT_PS1_SHOWUNTRACKEDFILES-}" ]; then
if [ -n "$(git ls-files --others --exclude-standard)" ]; then
u="%"
fi
fi

if [ -n "${GIT_PS1_SHOWUPSTREAM-}" ]; then
__git_ps1_show_upstream
fi
fi

local f="$w$i$s$u"
printf "${1:- (%s)}" "$c${b##refs/heads/}${f:+ $f}$r$p"
fi
}

__gitdir ()
{
if [ -z "${1-}" ]; then
if [ -n "${__git_dir-}" ]; then
echo "$__git_dir"
elif [ -d .git ]; then
echo .git
else
git rev-parse --git-dir 2>/dev/null
fi
elif [ -d "$1/.git" ]; then
echo "$1/.git"
else
echo "$1"
fi
}
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