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|
#! /bin/sh
set -euf
## SYNOPSIS
# [debug=true] build compile SRCFILE DSTFILE
# [debug=true] build deps SRCFILE...
build() {
# usage_pattern is used to extract build directive declarations.
usage_pattern='## usage: \(.*\) -> \([^ ]\+\) \(.*\)'
script='s/^'"$usage_pattern"'$/\2_directive='"'"'\1'"'"'/p' \
setf build_x_directive_loader '$(sed -n "$script" "$%s")' 0
eval "$build_x_directive_loader"
case "$1" in
compile) build_compile "$2" "$3";;
deps) shift; build_deps "$@";;
*) echo "build: $1: bad command" >&2; return 23;;
esac
}
## usage: #@include \([0-9A-Za-z]\+\) -> build_include \1 \2
build_include() { cat<<EOF
$1a\\
# begin $2
$1r$(build_resolve $2)
$1a\\
# end $2
EOF
}
## usage: #@info -> build_info \1
build_info() { cat<<EOF
$1a\\
# this file was generated by //ship/build\\
# date: $(date -u --rfc-3339=s)\\
# version: $(git rev-parse HEAD)
EOF
}
## usage: build_compile SRCFILE DSTFILE
build_compile() {
script='s/^'"$usage_pattern"'$/\2_directive/p' \
setf build_directives '$(sed -n "$script" "$%s")' 0
script='
s/^'"$usage_pattern"'$/s:^ *\\([0-9]\\+\\) \1$:\2 \3:/p
$a\
t\
s:^ *\\([0-9]\\+\\) .*:echo \\1p:
' \
setf input_parser '$(sed -n "$script" "$%s")' 0
setf incomplete_pattern '$(make_incomplete_pattern $%s)' build_directives
SRCFILE="$1" setf src '$(cat "$%s")' SRCFILE
while needs_compilation "$src" "$incomplete_pattern"; do
setf sedgen '$(echo "$%s" | nl -b a -s \ | sed "$%s")' src input_parser
setf sedscript '$(eval "$%s")' sedgen
setf src '$(echo "$%s" | sed -n "$%s")' src sedscript
done
echo "$src" > "$2"
chmod +x "$2"
}
## usage: needs_compilation SHELLSCRIPT PATTERN
# Returns true if SRCFILE contains compilation directives.
needs_compilation() {
echo "$1" | grep -q "$2"
}
## usage: build_deps SRCFILE...
# Print all the dependencies of SRCFILE... (in alphabetic order) to stdout.
build_deps() {
while test $# -gt 0; do
deps="$(
for f; do
for d in $(sed -n 's:^'"$build_include_directive"'$:\1:p' "$f"); do
build_resolve $d
done
done
)"
set -- $deps
if test $# -gt 0; then
echo "$deps"
fi
done | sort | uniq
}
## 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: $1: library not found" >&2
return 23
}
}
## usage: make_incomplete_pattern BUILD_DIRECTIVES...
make_incomplete_pattern() {
echo "^\\($(
for directive; do
eval echo \"\$$directive\"
done |
tr \\n \| |
sed 's/|/\\|/'
)\\)$"
}
## usage: setf NAME FMT [ARG...]
setf() {
value_script="$(shift; printf "$@")"
eval "$1=$value_script"
if test "${debug-false}" = true; then
eval 'echo "[35m$1=\"$value_script\"[m"'
eval 'echo "'"\$$1"'"' | nl -b a
fi >&2
}
## main
build "$@"
|
