First implementationHEADmain

4 files changed, 126 insertions, 0 deletions

diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..dffc1e9
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,86 @@
+.POSIX:
+DATE         = 1970-01-01
+VERSION      = 0.1.0
+NAME         = lddeps
+NAME_UC      = $(NAME)
+LANGUAGES    = en
+## Installation prefix.  Defaults to "/usr".
+PREFIX       = /usr
+BINDIR       = $(PREFIX)/bin
+LIBDIR       = $(PREFIX)/lib
+INCLUDEDIR   = $(PREFIX)/include
+SRCDIR       = $(PREFIX)/src/$(NAME)
+SHAREDIR     = $(PREFIX)/share
+LOCALEDIR    = $(SHAREDIR)/locale
+MANDIR       = $(SHAREDIR)/man
+EXEC         = ./
+## Where to store the installation.  Empty by default.
+DESTDIR      =
+LDLIBS       =
+
+
+
+.SUFFIXES:
+
+
+
+all:
+include deps.mk
+
+sources = \
+	$(sources.sh)                  \
+
+
+derived-assets = \
+
+side-assets = \
+
+
+
+## Default target.  Builds all artifacts required for testing
+## and installation.
+all: $(derived-assets)
+
+
+
+check-unit:
+
+
+check-integration:
+
+
+## Run all tests.  Each test suite is isolated, so that a parallel
+## build can run tests at the same time.  The required artifacts
+## are created if missing.
+check: check-unit check-integration
+
+
+
+## Remove *all* derived artifacts produced during the build.
+## A dedicated test asserts that this is always true.
+clean:
+	rm -rf $(derived-assets) $(side-assets)
+
+
+## Installs into $(DESTDIR)$(PREFIX).  Its dependency target
+## ensures that all installable artifacts are crafted beforehand.
+install: all
+	mkdir -p \
+		'$(DESTDIR)$(BINDIR)'     \
+		'$(DESTDIR)$(SRCDIR)'
+	cp $(sources.sh)     '$(DESTDIR)$(BINDIR)'
+	cp $(sources.sh)     '$(DESTDIR)$(SRCDIR)'
+
+
+## Uninstalls from $(DESTDIR)$(PREFIX).  This is a perfect mirror
+## of the "install" target, and removes *all* that was installed.
+## A dedicated test asserts that this is always true.
+uninstall:
+	rm -rf \
+		'$(DESTDIR)$(SRCDIR)'
+	for f in $(sources.sh); do \
+		rm -f '$(DESTDIR)$(BINDIR)'/"$${f#src/}"; \
+	done
+
+
+ALWAYS:
diff --git a/deps.mk b/deps.mk
new file mode 100644
index 0000000..cbd6312
--- /dev/null
+++ b/deps.mk
@@ -0,0 +1,3 @@
+sources.sh = \
+	src/lddeps \
+
diff --git a/mkdeps.sh b/mkdeps.sh
new file mode 100755
index 0000000..8204798
--- /dev/null
+++ b/mkdeps.sh
@@ -0,0 +1,13 @@
+#!/bin/sh
+set -eu
+
+export LANG=POSIX.UTF-8
+
+varlist() {
+	printf '%s = \\\n' "$1"
+	sort | sed 's|^\(.*\)$|\t\1 \\|'
+	printf '\n'
+}
+
+
+find src/* -type f -perm -111 | varlist 'sources.sh'
diff --git a/src/lddeps b/src/lddeps
new file mode 100755
index 0000000..ce1c629
--- /dev/null
+++ b/src/lddeps
@@ -0,0 +1,24 @@
+#!/bin/sh
+set -eu
+set -o pipefail
+
+search_in_path() (
+	CURRENT="$1"
+	IFS=:
+	for path in $LIBRARY_PATH; do
+		f="$path"/deps/"$CURRENT".txt
+		if [ -e "$f" ] && [ ! -d "$NAME" ]; then
+			cat "$f"
+			exit 0
+		fi
+	done
+	exit 127
+)
+
+for NAME in "$@"; do
+	if [ -e "$NAME" ] && [ ! -d "$NAME" ]; then
+		cat "$NAME"
+	else
+		search_in_path "$NAME"
+	fi
+done | tac | first | tac | sed 's/^\(.*\)$/-l\1/' | paste -sd' '