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|
#! /bin/sh
set -euf
## SYNOPSIS
# [debug=true] build compile SRCFILE DSTFILE
# [debug=true] build deps SRCFILE
build() {
case "$1" in
compile) build_compile "$2" "$3";;
deps) build_deps "$2";;
*) echo "build: $1: bad command" >&2; return 23;;
esac
}
# usage: debug_script VARNAME [DESCRIPTION]
debug_script() {
if test "${debug-false}" = true; then
printf '[35m====== %s%s[m\n%s\n' \
"$1" \
"${2+" ($2)"}" \
"$(eval echo \"\$$1\" | nl -b a)" >&2
fi
}
## build directives
build_info_directive='#@info'
build_include_directive='#@include \([0-9A-Za-z]\+\)'
input_parser="\
s:^ *\([0-9]\+\) "$build_info_directive"$:build_info \1:
s:^ *\([0-9]\+\) "$build_include_directive"$:build_include \1 \2:
t
s:^ *\([0-9]\+\) .*:echo \1p:"
debug_script input_parser
## usage: build_include LINENO LIBNAME
build_include() { cat<<EOF
$1a\\
# begin $2
$1r$(build_resolve $2)
$1a\\
# end $2
EOF
}
## usage: build_info LINENO
build_info() { cat<<EOF
$1a\\
# this file was generated by //ship/build\\
# date: $(date -u --rfc-3339=s)\\
# version: $(git rev-parse HEAD)
EOF
}
## usage: build_compile SRCFILE DSTFILE
build_compile() {
srcfile="$(cat "$1")"
debug_script srcfile 'SRCFILE'
while needs_compilation "$srcfile"; do
script="$(make_sedscript_maker_shellscript "$srcfile")"
srcfile="$(echo "$srcfile" | sed -n "$script")"
debug_script srcfile 'sed sedscript srcfile'
done
echo "$srcfile" > "$2"
chmod +x "$2"
}
## usage: needs_compilation SHELLSCRIPT
# Returns true if SRCFILE contains compilation directives.
needs_compilation() {
echo "$1" |
grep -q "^\\($build_include_directive\\|$build_info_directive\\)$"
}
## usage: make_sedscript_maker_shellscript SRCFILE
# Print a shellscript that creates a sedscript that resolves all the build
# directives in SRCFILE.
make_sedscript_maker_shellscript() {
sedscript_generator="$(echo "$1" | nl -b a -s ' ' | sed "$input_parser")"
debug_script sedscript_generator 'sed input_parser srcfile'
sedscript="$(eval "$sedscript_generator")"
debug_script sedscript 'eval sedscript_generator'
echo "$sedscript"
}
## usage: build_deps SRCFILE
build_deps() {
for libname in $(sed -n 's:^'"$build_include_directive"'$:\1:p' "$1"); do
build_resolve "$libname"
done
}
## 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: $1: library not found" >&2
return 23
}
}
build "$@"
|
