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|
#! /bin/sh
set -euf
## SYNOPSIS
# [debug=true] build compile SRCFILE DSTFILE
# [debug=true] build deps SRCFILE...
build() {
## Load macro definitions.
defmacro_pattern='## usage: \(.*\) -> \([^ ]\+\) \(.*\)'
script='s/^'"$defmacro_pattern"'$/\2_macro='"'"'\1'"'"'/p' \
setf defmacros '$(sed -n "$script" "$%s")' 0
eval "$defmacros"
## Dispatch.
case "$1" in
compile) build_compile "$2" "$3";;
deps) shift; build_deps "$@";;
*) echo "build: $1: bad command" >&2; return 23;;
esac
}
###
### macros
###
## usage: #@include \([0-9A-Za-z]\+\) -> build_include \1 \2
build_include() {
if buildcache_has "#@include:$2"; then
printf '%da\\\n##include %s: already done\n' $1 $2
else
buildcache_add "#@include:$2"
cat<<EOF
$1a\\
# begin $2
$1r$(build_resolve $2)
$1a\\
# end $2
EOF
fi
}
## usage: #@info -> build_info \1
build_info() { cat<<EOF
$1a\\
# this file was generated by //ship/build\\
# date: $(date -u --rfc-3339=s)\\
# version: $(git rev-parse HEAD)
EOF
}
###
### main subroutines
###
## usage: build_compile SRCFILE DSTFILE
build_compile() {
script='s/^'"$defmacro_pattern"'$/\2_macro/p' \
setf macro_names '$(sed -n "$script" "$%s")' 0
setf unexpanded_macros_pattern \
'$(make_unexpanded_macros_pattern $%s)' macro_names
script='
s/^'"$defmacro_pattern"'$/s:^ *\\([0-9]\\+\\) \1$:\2 \3:/p
$a\
t;s:^ *\\([0-9]\\+\\) .*:echo \\1p:
' \
setf input_parser '$(sed -n "$script" "$%s")' 0
SRCFILE="$1" setf src '$(cat "$%s")' SRCFILE
buildcache_initialize "$2"
while echo "$src" | grep -q "$unexpanded_macros_pattern"; do
setf sedgen '$(echo "$%s" | nl -b a -s \ | sed "$%s")' src input_parser
setf sedscript '$(eval "$%s")' sedgen
setf src '$(echo "$%s" | sed -n "$%s")' src sedscript
done
buildcache_finalize
echo "$src" > "$2"
chmod +x "$2"
}
## usage: build_deps SRCFILE...
# Print all the dependencies of SRCFILE... to stdout. (alphabetic order)
build_deps() {
while test $# -gt 0; do
deps="$(
for f; do
for d in $(sed -n 's:^'"$build_include_macro"'$:\1:p' "$f"); do
build_resolve $d
done
done
)"
set -- $deps
if test $# -gt 0; then
echo "$deps"
fi
done | sort | uniq
}
###
### misc utilities
###
## usage: build_resolve LIBNAME
build_resolve() {
echo "$BUILD_PATH" | tr : \\n |
xargs -I: printf '%s/%s\n' : "$1" |
xargs -I: ls -d : 2>/dev/null |
head -n 1 |
grep . ||
{
echo "build resolve: $1: library not found" >&2
return 23
}
}
## usage: make_unexpanded_macros_pattern BUILD_DIRECTIVES...
make_unexpanded_macros_pattern() {
echo "^\\($(
for macro; do
eval echo \"\$$macro\"
done |
tr \\n \| |
sed 's/|/\\|/'
)\\)$"
}
## usage: setf NAME FMT [ARG...]
setf() {
value_script="$(shift; printf "$@")"
eval "$1=$value_script"
if is_debug_mode; then
eval 'echo "[35m$1=\"$value_script\"[m"'
eval 'echo "'"\$$1"'"' | nl -b a
fi >&2
}
## usage: is_debug_mode
is_debug_mode() {
test "${debug-false}" = true
}
###
### buildcache utilities
###
## usage: buildcache_initialize DESTFILE
buildcache_initialize() {
buildcache="$1.buildcache"
cat /dev/null > "$buildcache"
}
## usage: buildcache_finalize
buildcache_finalize() {
if is_debug_mode; then
rm "$buildcache"
fi
}
## usage: buildcache_has BRE
# Check if buildcache contains a line matching BRE.
buildcache_has() {
grep -q "^$1" "$buildcache"
}
## usage: buildcache_add LINE
# Add LINE to buildcache.
buildcache_add() {
echo "$1" >> "$buildcache"
}
###
### main invocation
###
build "$@"
|
