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#!/bin/sh
#
# Build two documentation trees and diff the resulting formatted output.
# Compared to a source diff, this can reveal mistakes in the formatting.
# For example:
#
# ./doc-diff origin/master HEAD
#
# would show the differences introduced by a branch based on master.
OPTIONS_SPEC="\
doc-diff [options] <from> <to> [-- <diff-options>]
doc-diff (-c|--clean)
--
j=n parallel argument to pass to make
f force rebuild; do not rely on cached results
c,clean cleanup temporary working files
from-asciidoc use asciidoc with the 'from'-commit
from-asciidoctor use asciidoctor with the 'from'-commit
asciidoc use asciidoc with both commits
to-asciidoc use asciidoc with the 'to'-commit
to-asciidoctor use asciidoctor with the 'to'-commit
asciidoctor use asciidoctor with both commits
cut-footer cut away footer
"
SUBDIRECTORY_OK=1
. "$(git --exec-path)/git-sh-setup"
parallel=
force=
clean=
from_program=
to_program=
cut_footer=
while test $# -gt 0
do
case "$1" in
-j)
parallel=$2; shift ;;
-c|--clean)
clean=t ;;
-f)
force=t ;;
--from-asciidoctor)
from_program=-asciidoctor ;;
--to-asciidoctor)
to_program=-asciidoctor ;;
--asciidoctor)
from_program=-asciidoctor
to_program=-asciidoctor ;;
--from-asciidoc)
from_program=-asciidoc ;;
--to-asciidoc)
to_program=-asciidoc ;;
--asciidoc)
from_program=-asciidoc
to_program=-asciidoc ;;
--cut-footer)
cut_footer=-cut-footer ;;
--)
shift; break ;;
*)
usage ;;
esac
shift
done
tmp="$(git rev-parse --show-toplevel)/Documentation/tmp-doc-diff" || exit 1
if test -n "$clean"
then
test $# -eq 0 || usage
git worktree remove --force "$tmp/worktree" 2>/dev/null
rm -rf "$tmp"
exit 0
fi
if test -z "$parallel"
then
parallel=$(getconf _NPROCESSORS_ONLN 2>/dev/null)
if test $? != 0 || test -z "$parallel"
then
parallel=1
fi
fi
test $# -gt 1 || usage
from=$1; shift
to=$1; shift
from_oid=$(git rev-parse --verify "$from") || exit 1
to_oid=$(git rev-parse --verify "$to") || exit 1
if test -n "$force"
then
rm -rf "$tmp"
fi
# We'll do both builds in a single worktree, which lets "make" reuse
# results that don't differ between the two trees.
if ! test -d "$tmp/worktree"
then
git worktree add -f --detach "$tmp/worktree" "$from" &&
dots=$(echo "$tmp/worktree" | sed 's#[^/]*#..#g') &&
ln -s "$dots/config.mak" "$tmp/worktree/config.mak"
fi
construct_makemanflags () {
if test "$1" = "-asciidoc"
then
echo USE_ASCIIDOCTOR=
elif test "$1" = "-asciidoctor"
then
echo USE_ASCIIDOCTOR=YesPlease
fi
}
from_makemanflags=$(construct_makemanflags "$from_program") &&
to_makemanflags=$(construct_makemanflags "$to_program") &&
from_dir=$from_oid$from_program$cut_footer &&
to_dir=$to_oid$to_program$cut_footer &&
# generate_render_makefile <srcdir> <dstdir>
generate_render_makefile () {
find "$1" -type f |
while read src
do
dst=$2/${src#$1/}
printf 'all: %s\n' "$dst"
printf '%s: %s\n' "$dst" "$src"
printf '\t@echo >&2 " RENDER $(notdir $@)" && \\\n'
printf '\tmkdir -p $(dir $@) && \\\n'
printf '\tMANWIDTH=80 man $< >$@+ && \\\n'
printf '\tmv $@+ $@\n'
done
}
# render_tree <committish_oid> <directory_name> <makemanflags>
render_tree () {
# Skip install-man entirely if we already have an installed directory.
# We can't rely on make here, since "install-man" unconditionally
# copies the files (spending effort, but also updating timestamps that
# we then can't rely on during the render step). We use "mv" to make
# sure we don't get confused by a previous run that failed partway
# through.
oid=$1 &&
dname=$2 &&
makemanflags=$3 &&
if ! test -d "$tmp/installed/$dname"
then
git -C "$tmp/worktree" checkout --detach "$oid" &&
make -j$parallel -C "$tmp/worktree" \
$makemanflags \
GIT_VERSION=omitted \
SOURCE_DATE_EPOCH=0 \
DESTDIR="$tmp/installed/$dname+" \
install-man &&
mv "$tmp/installed/$dname+" "$tmp/installed/$dname"
fi &&
# As with "installed" above, we skip the render if it's already been
# done. So using make here is primarily just about running in
# parallel.
if ! test -d "$tmp/rendered/$dname"
then
generate_render_makefile "$tmp/installed/$dname" \
"$tmp/rendered/$dname+" |
make -j$parallel -f - &&
mv "$tmp/rendered/$dname+" "$tmp/rendered/$dname"
if test "$cut_footer" = "-cut-footer"
then
for f in $(find "$tmp/rendered/$dname" -type f)
do
head -n -2 "$f" | sed -e '${/^$/d}' >"$f+" &&
mv "$f+" "$f" ||
return 1
done
fi
fi
}
render_tree $from_oid $from_dir $from_makemanflags &&
render_tree $to_oid $to_dir $to_makemanflags &&
git -C $tmp/rendered diff --no-index "$@" $from_dir $to_dir
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