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|
#! /bin/sh
set -euf
## SYNOPSIS
# build compile SRCFILE DSTFILE
# 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
}
## build directives
build_include_directive='#@include \([0-9A-Za-z]\+\)'
## usage: build_compile SRCFILE DSTFILE
build_compile() {
cp "$1" "$2"
while needs_compilation "$2"; do
script="$(make_sedscript_maker_shellscript "$2" | sh)"
sed -n "$script" "$2" >"$2.tmp"
mv "$2.tmp" "$2"
done
chmod +x "$2"
}
## usage: needs_compilation SRCFILE
# Returns true if SRCFILE contains compilation directives.
needs_compilation() {
grep -q "^$build_include_directive$" "$1"
}
## usage: make_sedscript_maker_shellscript SRCFILE
# Print a shellscript that creates a sedscript that resolves all the build
# directives in SRCFILE.
make_sedscript_maker_shellscript() {
echo 'set -euf'
deps="$(build_deps "$1")"
for lib in $deps; do
echo "_build_include_$(basename $lib)=$lib"
done
nl -b a -s ' ' "$1" |
sed '
s:^ *::
s:^\([0-9]\+\) '"$build_include_directive"'$:\1a\\\\\
# BEGIN \2\
\1r\$_build_include_\2\
\1a\\\\\
# END \2:
s:^\([0-9]\+\) .*:\1p:
1s:^:echo ":
$s:$:":
'
}
## 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: $1: library not found" >&2
return 23
}
}
build "$@"
|
