env/utils/shgit

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# shgit
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# Written in 2019 by Lucas
# CC0 1.0 Universal/Public domain - No rights reserved
#
# To the extent possible under law, the author(s) have dedicated all
# copyright and related and neighboring rights to this software to the
# public domain worldwide. This software is distributed without any
# warranty. You should have received a copy of the CC0 Public Domain
# Dedication along with this software. If not, see
# <http://creativecommons.org/publicdomain/zero/1.0/>.
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shgit()
{
: ${SHGIT_BEGIN:=} ${SHGIT_END:= } ${SHGIT_SEP:=:}
gitdir=$(git rev-parse --git-dir 2>/dev/null) && [ -n "$gitdir" ] ||
return
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if ! name=$(git symbolic-ref -q --short HEAD); then
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name=$(git rev-parse --short HEAD 2>/dev/null)
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name=${name:-?}
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fi
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rb=
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rbdir=$gitdir/rebase-merge
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if [ -d "$rbdir" ]; then
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rb=${SHGIT_SEP}REBASE
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read -r name <"$rbdir/head-name"
name=${name##*/}
[ -f "$rbdir/interactive" ] && rb="$rb-i"
rbcount=$(wc -l <"$rbdir/done")
read -r rbtotal <"$rbdir/end"
rb="$rb ${rbcount##* }/$rbtotal"
fi
status=
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[ -n "$(git status --porcelain)" ] && status=${SHGIT_SEP}*
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IFS=" " set -- $(git rev-list --left-right --count \
@{upstream}...HEAD 2>/dev/null)
commits=v${1:-0}^${2:-0}
commits=${commits#v0}
commits=${commits%^0}
commits=${commits:+$SHGIT_SEP$commits}
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printf "%s%s%s" "$SHGIT_BEGIN" "$name$rb$status$commits" "$SHGIT_END"
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}