freshlybakedca.ke
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1#!/bin/sh
2#
3# Build two documentation trees and diff the resulting formatted output.
4# Compared to a source diff, this can reveal mistakes in the formatting.
5# For example:
6#
7# ./doc-diff origin/master HEAD
8#
9# would show the differences introduced by a branch based on master.
10
11OPTIONS_SPEC="\
12doc-diff [options] <from> <to> [-- <diff-options>]
13doc-diff (-c|--clean)
14--
15j=n parallel argument to pass to make
16f force rebuild; do not rely on cached results
17c,clean cleanup temporary working files
18from-asciidoc use asciidoc with the 'from'-commit
19from-asciidoctor use asciidoctor with the 'from'-commit
20asciidoc use asciidoc with both commits
21to-asciidoc use asciidoc with the 'to'-commit
22to-asciidoctor use asciidoctor with the 'to'-commit
23asciidoctor use asciidoctor with both commits
24cut-footer cut away footer
25"
26SUBDIRECTORY_OK=1
27. "$(git --exec-path)/git-sh-setup"
28
29parallel=
30force=
31clean=
32from_program=
33to_program=
34cut_footer=
35while test $# -gt 0
36do
37 case "$1" in
38 -j)
39 parallel=$2; shift ;;
40 -c|--clean)
41 clean=t ;;
42 -f)
43 force=t ;;
44 --from-asciidoctor)
45 from_program=-asciidoctor ;;
46 --to-asciidoctor)
47 to_program=-asciidoctor ;;
48 --asciidoctor)
49 from_program=-asciidoctor
50 to_program=-asciidoctor ;;
51 --from-asciidoc)
52 from_program=-asciidoc ;;
53 --to-asciidoc)
54 to_program=-asciidoc ;;
55 --asciidoc)
56 from_program=-asciidoc
57 to_program=-asciidoc ;;
58 --cut-footer)
59 cut_footer=-cut-footer ;;
60 --)
61 shift; break ;;
62 *)
63 usage ;;
64 esac
65 shift
66done
67
68tmp="$(git rev-parse --show-toplevel)/Documentation/tmp-doc-diff" || exit 1
69
70if test -n "$clean"
71then
72 test $# -eq 0 || usage
73 git worktree remove --force "$tmp/worktree" 2>/dev/null
74 rm -rf "$tmp"
75 exit 0
76fi
77
78if test -z "$parallel"
79then
80 parallel=$(getconf _NPROCESSORS_ONLN 2>/dev/null)
81 if test $? != 0 || test -z "$parallel"
82 then
83 parallel=1
84 fi
85fi
86
87test $# -gt 1 || usage
88from=$1; shift
89to=$1; shift
90
91from_oid=$(git rev-parse --verify "$from") || exit 1
92to_oid=$(git rev-parse --verify "$to") || exit 1
93
94if test -n "$force"
95then
96 rm -rf "$tmp"
97fi
98
99# We'll do both builds in a single worktree, which lets "make" reuse
100# results that don't differ between the two trees.
101if ! test -d "$tmp/worktree"
102then
103 git worktree add -f --detach "$tmp/worktree" "$from" &&
104 dots=$(echo "$tmp/worktree" | sed 's#[^/]*#..#g') &&
105 ln -s "$dots/config.mak" "$tmp/worktree/config.mak"
106fi
107
108construct_makemanflags () {
109 if test "$1" = "-asciidoc"
110 then
111 echo USE_ASCIIDOCTOR=
112 elif test "$1" = "-asciidoctor"
113 then
114 echo USE_ASCIIDOCTOR=YesPlease
115 fi
116}
117
118from_makemanflags=$(construct_makemanflags "$from_program") &&
119to_makemanflags=$(construct_makemanflags "$to_program") &&
120
121from_dir=$from_oid$from_program$cut_footer &&
122to_dir=$to_oid$to_program$cut_footer &&
123
124# generate_render_makefile <srcdir> <dstdir>
125generate_render_makefile () {
126 find "$1" -type f |
127 while read src
128 do
129 dst=$2/${src#$1/}
130 printf 'all: %s\n' "$dst"
131 printf '%s: %s\n' "$dst" "$src"
132 printf '\t@echo >&2 " RENDER $(notdir $@)" && \\\n'
133 printf '\tmkdir -p $(dir $@) && \\\n'
134 printf '\tMANWIDTH=80 man $< >$@+ && \\\n'
135 printf '\tmv $@+ $@\n'
136 done
137}
138
139# render_tree <committish_oid> <directory_name> <makemanflags>
140render_tree () {
141 # Skip install-man entirely if we already have an installed directory.
142 # We can't rely on make here, since "install-man" unconditionally
143 # copies the files (spending effort, but also updating timestamps that
144 # we then can't rely on during the render step). We use "mv" to make
145 # sure we don't get confused by a previous run that failed partway
146 # through.
147 oid=$1 &&
148 dname=$2 &&
149 makemanflags=$3 &&
150 if ! test -d "$tmp/installed/$dname"
151 then
152 git -C "$tmp/worktree" checkout --detach "$oid" &&
153 make -j$parallel -C "$tmp/worktree" \
154 $makemanflags \
155 GIT_VERSION=omitted \
156 GIT_DATE=1970-01-01 \
157 DESTDIR="$tmp/installed/$dname+" \
158 install-man &&
159 mv "$tmp/installed/$dname+" "$tmp/installed/$dname"
160 fi &&
161
162 # As with "installed" above, we skip the render if it's already been
163 # done. So using make here is primarily just about running in
164 # parallel.
165 if ! test -d "$tmp/rendered/$dname"
166 then
167 generate_render_makefile "$tmp/installed/$dname" \
168 "$tmp/rendered/$dname+" |
169 make -j$parallel -f - &&
170 mv "$tmp/rendered/$dname+" "$tmp/rendered/$dname"
171
172 if test "$cut_footer" = "-cut-footer"
173 then
174 for f in $(find "$tmp/rendered/$dname" -type f)
175 do
176 head -n -2 "$f" | sed -e '${/^$/d}' >"$f+" &&
177 mv "$f+" "$f" ||
178 return 1
179 done
180 fi
181 fi
182}
183
184render_tree $from_oid $from_dir $from_makemanflags &&
185render_tree $to_oid $to_dir $to_makemanflags &&
186git -C $tmp/rendered diff --no-index "$@" $from_dir $to_dir