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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" "$3";;
deps) shift; build_deps "$@";;
*) 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
}
## 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: $(git rev-parse HEAD)
EOF
}
## usage: build_compile SRCFILE DSTFILE
build_compile() {
srcfile="$(cat "$1")"
debug_script srcfile 'SRCFILE'
build_directives="$(make_build_directives "$0")"
debug_script build_directives '$0'
build_x_directive_loader="$(make_build_x_directive_loader "$0")"
debug_script build_x_directive_loader '$0'
eval "$build_x_directive_loader"
input_parser="$(make_input_parser "$0")"
sentinel="$(make_needs_compilation_sentinel $build_directives)"
while needs_compilation "$srcfile" "$sentinel"; do
script="$(make_sedscript_maker_shellscript "$srcfile" "$input_parser")"
srcfile="$(echo "$srcfile" | sed -n "$script")"
debug_script srcfile 'sed sedscript srcfile'
done
echo "$srcfile" > "$2"
chmod +x "$2"
}
## usage: needs_compilation SHELLSCRIPT SENTINEL
# Returns true if SRCFILE contains compilation directives.
needs_compilation() {
echo "$1" | grep -q "$2"
}
## usage: make_sedscript_maker_shellscript SRCFILE INPUT_PARSER
# Print a shellscript that creates a sedscript that resolves all the build
# directives in SRCFILE.
make_sedscript_maker_shellscript() {
sedscript_generator="$(echo "$1" | nl -b a -s ' ' | sed "$2")"
debug_script sedscript_generator 'sed input_parser srcfile'
sedscript="$(eval "$sedscript_generator")"
debug_script sedscript 'eval sedscript_generator'
echo "$sedscript"
}
## 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: $1: library not found" >&2
return 23
}
}
## usage: make_input_parser FILENAME
make_input_parser() {
echo "$(sed -n '
s/^## usage: \(.*\) -> \([^ ]\+\) \(.*\)$/s:^ *\\([0-9]\\+\\) \1$:\2 \3:/p
$a\
t;s:^ *\\([0-9]\\+\\) .*:echo \\1p:
' "$1")"
}
## usage: make_build_directives FILENAME
make_build_directives() {
echo "$(sed -n '
s/^## usage: \(.*\) -> \([^ ]\+\) \(.*\)$/\2_directive/p
' "$0")"
}
## usage: make_build_x_directive_loader FILENAME
make_build_x_directive_loader() {
sed -n '
s/^## usage: \(.*\) -> \([^ ]\+\) \(.*\)$/\2_directive='"'"'\1'"'"'/p
' "$1"
}
## usage: make_needs_compilation_sentinel BUILD_DIRECTIVES...
make_needs_compilation_sentinel() {
echo "^\\($(
for directive; do
eval echo \"\$$directive\"
done |
tr \\n \| |
sed 's/|/\\|/'
)\\)$"
}
## main
build "$@"
|
