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#!/bin/sh
#
# A minimal alternative to djb redo that doesn't support incremental builds.
# For the full version, visit http://github.com/apenwarr/redo
#
# The author disclaims copyright to this source file and hereby places it in
# the public domain. (2010 12 14)
#
# By default, no output coloring.
green=""
bold=""
plain=""
if [ -n "$TERM" -a "$TERM" != "dumb" ] && tty <&2 >/dev/null 2>&1; then
green="$(printf '\033[32m')"
bold="$(printf '\033[1m')"
plain="$(printf '\033[m')"
fi
_dirsplit()
{
base=${1##*/}
dir=${1%$base}
}
dirname()
(
_dirsplit "$1"
dir=${dir%/}
echo "${dir:-.}"
)
_dirsplit "$0"
export REDO=$(cd "${dir:-.}" && echo "$PWD/$base")
DO_TOP=
if [ -z "$DO_BUILT" ]; then
DO_TOP=1
[ -n "$*" ] || set all # only toplevel redo has a default target
export DO_BUILT=$PWD/.do_built
: >>"$DO_BUILT"
echo "Removing previously built files..." >&2
sort -u "$DO_BUILT" | tee "$DO_BUILT.new" |
while read f; do printf "%s\0%s.did\0" "$f" "$f"; done |
xargs -0 rm -f 2>/dev/null
mv "$DO_BUILT.new" "$DO_BUILT"
DO_PATH=$DO_BUILT.dir
export PATH=$DO_PATH:$PATH
rm -rf "$DO_PATH"
mkdir "$DO_PATH"
for d in redo redo-ifchange; do
ln -s "$REDO" "$DO_PATH/$d";
done
[ -e /bin/true ] && TRUE=/bin/true || TRUE=/usr/bin/true
for d in redo-ifcreate redo-stamp redo-always; do
ln -s $TRUE "$DO_PATH/$d";
done
fi
_find_dofile_pwd()
{
dofile=default.$1.do
while :; do
dofile=default.${dofile#default.*.}
[ -e "$dofile" -o "$dofile" = default.do ] && break
done
ext=${dofile#default}
ext=${ext%.do}
base=${1%$ext}
}
_find_dofile()
{
local prefix=
while :; do
_find_dofile_pwd "$1"
[ -e "$dofile" ] && break
[ "$PWD" = "/" ] && break
target=${PWD##*/}/$target
tmp=${PWD##*/}/$tmp
prefix=${PWD##*/}/$prefix
cd ..
done
base=$prefix$base
}
_run_dofile()
{
export DO_DEPTH="$DO_DEPTH "
export REDO_TARGET=$PWD/$target
local line1
set -e
read line1 <"$PWD/$dofile" || true
cmd=${line1#"#!/"}
if [ "$cmd" != "$line1" ]; then
/$cmd "$PWD/$dofile" "$@" >"$tmp.tmp2"
else
:; . "$PWD/$dofile" >"$tmp.tmp2"
fi
}
_do()
{
local dir=$1 target=$2 tmp=$3
if [ ! -e "$target" ] || [ -d "$target" -a ! -e "$target.did" ]; then
printf '%sdo %s%s%s%s\n' \
"$green" "$DO_DEPTH" "$bold" "$dir$target" "$plain" >&2
echo "$PWD/$target" >>"$DO_BUILT"
dofile=$target.do
base=$target
ext=
[ -e "$target.do" ] || _find_dofile "$target"
if [ ! -e "$dofile" ]; then
echo "do: $target: no .do file" >&2
return 1
fi
[ ! -e "$DO_BUILT" ] || [ ! -d "$(dirname "$target")" ] ||
: >>"$target.did"
( _run_dofile "$target" "$base" "$tmp.tmp" )
rv=$?
if [ $rv != 0 ]; then
printf "do: %s%s\n" "$DO_DEPTH" \
"$dir$target: got exit code $rv" >&2
rm -f "$tmp.tmp" "$tmp.tmp2"
return $rv
fi
mv "$tmp.tmp" "$target" 2>/dev/null ||
! test -s "$tmp.tmp2" ||
mv "$tmp.tmp2" "$target" 2>/dev/null
rm -f "$tmp.tmp2"
else
echo "do $DO_DEPTH$target exists." >&2
fi
}
# Make corrections for directories that don't actually exist yet.
_dir_shovel()
{
local dir base
xdir=$1 xbase=$2 xbasetmp=$2
while [ ! -d "$xdir" -a -n "$xdir" ]; do
_dirsplit "${xdir%/}"
xbasetmp=${base}__$xbase
xdir=$dir xbase=$base/$xbase
echo "xbasetmp='$xbasetmp'" >&2
done
}
_redo()
{
set +e
for i in "$@"; do
_dirsplit "$i"
_dir_shovel "$dir" "$base"
dir=$xdir base=$xbase basetmp=$xbasetmp
( cd "$dir" && _do "$dir" "$base" "$basetmp" )
[ "$?" = 0 ] || return 1
done
}
_redo "$@"
[ "$?" = 0 ] || exit 1
if [ -n "$DO_TOP" ]; then
echo "Removing stamp files..." >&2
[ ! -e "$DO_BUILT" ] ||
while read f; do printf "%s.did\0" "$f"; done <"$DO_BUILT" |
xargs -0 rm -f 2>/dev/null
fi
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