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#!/bin/sh
# - Usage: dv command [options] [args]
# - dv is a dumb version management tool.
# - Options:
# - -a num set ancestor level (default 1)
# - -n dry-run mode, no changes are made
# - -v verbose mode
# - Commands:
unset CDPATH
export LC_ALL=C IFS='
'
version=dv-0.2
dvlib=${DVLIB:-$HOME/dvlib}
script="$(cd "$(dirname "$0")" && pwd)/${0##*/}"
aopt=1
case $(uname -o) in
(Android|Linux)
diffopt='--color=always'
lsopt='-v --color'
;;
(Darwin)
diffopt='--color=always'
lsopt='-G'
;;
(*BSD)
;;
esac
# anc [-a num] [dir] - prints the current ancestor of dir or current.
anc() {
set -- "$(dvdir "$1")"
for _ in $(seq "$aopt"); do
set -- "$1/.dv/anc"
done
[ -L "$1" ] && readlink -f "$1"
}
# clone [-nv] v1 [dir] - clones an iterm version into dir (default: item).
clone() {
case $1 in
('') die 'missing argument' ;;
(*[/.-]*) set -- "$(path "$1")" "$2" ;;
(*) set -- "$(head "$1")" "$2" ;;
esac
[ "$2" ] || { set -- "$1" "${1##*/}"; set -- "$1" "${2%%-*}"; }
[ -d "$1" ] || die "not found: $1"
rsync ${vopt:+"$vopt"} ${nopt:+"$nopt"} -a "$1/" "$2/"
rm -f "$2/.dv/anc" && ln -s "$1" "$2/.dv/anc"
}
# desc - prints the descendants of a version
desc() {
set -- "$(path "$1")"
set -- "$1" "${1%/*}"
set -- "$1" "${2##*/}"
for a in "$dvlib/$2"/*/.dv/anc*; do
[ "$a" -ef "$1" ] && echo "${a%/*/*}"
done
}
die() {
echo "$@" >&2
exit 1
}
# diff [-a num] [[v1] v2] - prints differences (default: current and ancestor).
diff() {
if [ "$2" ]; then
set -- "$(path "$2")" "$(path "$1")"
elif [ "$1" ]; then
set -- "$(path "$1")" "$(anc "$(path "$1")")"
else
set -- "$(dvdir)" "$(anc)"
fi
[ "$2" ] && command diff $diffopt -U 3 -x .dv "$2" "$1" | less -F
}
# dvdir prints the dir containing .dv.
dvdir() {
set -- "$(realpath "${1:-.}")"
while [ "$1" ]; do
[ -d "$1/.dv" ] && echo "$1" && return
set -- "${1%/*}"
done
}
# head - prints the branch head versions.
head() {
for v in "$dvlib/${1:-$(name)}/"*; do
[ "$(desc "$v")" ] || echo "$v"
done
}
# help - prints this help text.
help() {
while read -r line; do
case $line in
(\#*\ -\ *) ;;
(*) continue ;;
esac
set -- "${line% - *}" "${line#* - }"
[ "$1" = '#' ] || printf " %-26s" "${1#\# }"
echo "$2"
done < "$script"
}
# incv increments version.
incv() {
set -- "$1" "${1##*[-.a-z_A-Z]}"
set -- "${1%"$2"}" "$2"
echo "$1$(($2 + 1))"
}
# init - creates an initial clone in the current directory.
init() {
[ "$(dvdir)" ] && die "already initialized: $(dvdir)"
mkdir .dv
}
# ls [item] - lists dvlib.
ls() (
cd "$dvlib" && command ls $lsopt "$@"
)
# name prints the item name.
name() {
set -- "$(dvdir)"
[ "$1" ] && echo "${1##*/}" || die "not a dv item, no .dv found"
}
# path prints the version path, if exist.
path() {
case $1 in
(*/*|.) dvdir "$1"; return ;;
([0-9]*) set -- "$(name)-$1" ;;
esac
set -- "${1%%-*}" "${1#*-}"
[ -d "$dvlib/$1/$1-$2" ] && echo "$dvlib/$1/$1-$2"
}
# save [-nv] [v1] - creates a new version from clone.
save() {
[ "$1" ] && case $1 in (*[0-9]) ;; (*) die "invalid version: $1" ;; esac
set -- "$(dvdir)" "$(aopt=1 anc)" "$(name)" "${1#[a-zA-Z_]*-}"
set -- "$1" "$2" "$3" "${4:-$(incv "${2##*/[a-zA-Z_]*-}")}"
echo "$dvlib/$3/$3-$4"
command diff -q -x .dv "$2" "$1" >/dev/null 2>&1 && die 'no changes, abort'
[ "$nopt" ] && return
# Update ancestor in clone then copy in dvlib.
rm -f "$1/.dv/anc" && [ "$2" ] && ln -s "../../${2##*/}" "$1/.dv/anc"
rsync ${vopt:+"$vopt"} -a ${2:+--link-dest="$2"} --mkpath "$1/" "$dvlib/$3/$3-$4/"
# After save, clone ancestor points to new saved version.
rm -f "$1/.dv/anc" && ln -s "$dvlib/$3/$3-$4" "$1/.dv/anc"
}
# status - prints dv informations.
status() {
echo "lib: $dvlib"
set -- "$(dvdir)" "$(anc)"
[ "$1" ] || die "not a dv item, no .dv found"
echo "root: $1"
[ "$2" ] || die "no ancestor found, please save it first"
echo "anc: $2"
command diff -q -x .dv "$2" "$1"
}
# sync [url] - synchronize a remote dvlib.
sync() {
set -- "${1:-$(cat "$dvlib/.url" 2>/dev/null)}"
[ "$1" ] || die "missing url"
[ "$(cat "$dvlib/.url" 2>/dev/null)" = "$1" ] || echo "$1" > "$dvlib/.url"
rsync ${vopt:+"$vopt"} ${nopt:+"$nopt"} -aH --mkpath "$1/" "$dvlib/"
rsync ${vopt:+"$vopt"} ${nopt:+"$nopt"} -aH --mkpath "$dvlib/" "$1/"
}
# version - prints the current version of dv.
version() {
echo "$version"
}
# Main program starts here.
[ "$DVDEBUG" ] && set -x ||
case $1 in
(anc|clone|desc|diff|head|help|init|ls|path|save|status|sync|version) ;;
(*) help; exit 1;;
esac
cmd="$1"
shift
while getopts :a:nv opt; do
case $opt in
(a) aopt="$OPTARG" ;;
(n) nopt=-n ;;
(v) vopt=-v ;;
(*) help; exit ;;
esac
done
shift $((OPTIND - 1))
$cmd "$@"
# Todo:
# * a function to squash a branch in the trunk
# * merge another ancestor (use anc0, anc1, ...)
# * vendor management
# * show graphs (dot)
# * sync: dvlib sync / mirror: resolve conflict by branching
# * rename version.
# * .dvignore
# * make dvlib versions immutable.
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