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-rwxr-xr-xtools/makehelp.sh149
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diff --git a/tools/makehelp.sh b/tools/makehelp.sh
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+++ b/tools/makehelp.sh
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+#!/bin/sh
+set -eu
+
+. tools/lib.sh
+
+
+usage() {
+ cat <<-'EOF'
+ Usage:
+ makehelp.sh < MAKEFILE
+ makehelp.sh -h
+ EOF
+}
+
+help() {
+ cat <<-'EOF'
+
+
+ Options:
+ -h, --help show this message
+
+
+ Generate a help message from the given Makefile.
+
+ Any target or variable commented with two "#" characters gets
+ picked up. Multi-line comments are supported:
+
+ VAR1 = 1
+ # a comment
+ VAR2 = 2
+ ## another comment -> this one is included in the docs
+ VAR3 = 3
+
+ ## with a big
+ ## comment, which is also included
+ a-target:
+
+
+ Examples:
+
+ Generate help messages from "Makefile":
+
+ $ aux/makehelp.sh < Makefile
+
+
+ Generate help messages for all targets:
+
+ $ cat Makefile dev.mk | aux/makehelp.sh
+ EOF
+}
+
+
+for flag in "$@"; do
+ case "$flag" in
+ (--)
+ break
+ ;;
+ (--help)
+ usage
+ help
+ exit
+ ;;
+ (*)
+ ;;
+ esac
+done
+
+while getopts 'h' flag; do
+ case "$flag" in
+ (h)
+ usage
+ help
+ exit
+ ;;
+ (*)
+ usage >&2
+ exit 2
+ ;;
+ esac
+done
+shift $((OPTIND - 1))
+
+
+TARGETS="$(mkstemp)"
+VARIABLES="$(mkstemp)"
+trap 'rm -f "$TARGETS" "$VARIABLES"' EXIT
+
+awk -vCOLUMN=15 -vTARGETS="$TARGETS" -vVARIABLES="$VARIABLES" '
+function indent(n, where) {
+ for (INDENT = 0; INDENT < n; INDENT++) {
+ printf " " > where
+ }
+}
+
+/^## / { doc[len++] = substr($0, 4) }
+
+/^[-_a-zA-Z]+:/ && len {
+ printf "\033[36m%s\033[0m", substr($1, 1, length($1) - 1) > TARGETS
+ for (i = 0; i < len; i++) {
+ n = COLUMN - (i == 0 ? length($1) - 1 : 0)
+ indent(n, TARGETS)
+ printf "%s\n", doc[i] > TARGETS
+ }
+ len = 0
+}
+
+/^.++=/ && len {
+ printf "\033[36m%s\033[0m", $1 > VARIABLES
+ for (i = 0; i < len; i++) {
+ n = COLUMN - (i == 0 ? length($1) : 0)
+ indent(n, VARIABLES)
+ printf "%s\n", doc[i] > VARIABLES
+ }
+ len = 0
+}'
+
+
+
+indent() {
+ sed 's|^| |'
+}
+
+cat <<-EOF
+ Usage:
+
+ make [VARIABLE=value...] [target...]
+
+
+ Targets:
+
+ $(indent < "$TARGETS")
+
+
+ Variables:
+
+ $(indent < "$VARIABLES")
+
+
+ Examples:
+
+ Build "all", the default target:
+
+ $ make
+
+
+ Test and install, with \$(DESTDIR) set to "tmp/":
+
+ $ make DESTDIR=tmp check install
+EOF