contrib/chg/Makefile

chg: allows default hg path to be overridden

Before this patch, chg will fall back to "hg" if neither CHGHG nor HG are set.
This may have trouble if the "hg" in PATH is not compatible with chg, which
can happen, for example, an old hg is installed in a virtualenv.

Since it's very hard to do a quick hg version check from chg, after discussion
in IRC with smf and marmoute, the quickest solution is to build a package with
a hardcoded absolute hg path in chg. This patch makes it possible by adding a
C macro HGPATH.

HG = $(CURDIR)/../../hg

TARGET = chg
SRCS = chg.c hgclient.c util.c
OBJS = $(SRCS:.c=.o)

CFLAGS ?= -O2 -Wall -Wextra -pedantic -g
CPPFLAGS ?= -D_FORTIFY_SOURCE=2
override CFLAGS += -std=gnu99
ifdef HGPATH
override CPPFLAGS += -DHGPATH=\"$(HGPATH)\"
endif

DESTDIR =
PREFIX = /usr/local
MANDIR = $(PREFIX)/share/man/man1

CHGSOCKDIR = /tmp/chg$(shell id -u)
CHGSOCKNAME = $(CHGSOCKDIR)/server

.PHONY: all
all: $(TARGET)

$(TARGET): $(OBJS)
	$(CC) $(LDFLAGS) -o $@ $(OBJS)

chg.o: hgclient.h util.h
hgclient.o: hgclient.h util.h
util.o: util.h

.PHONY: install
install: $(TARGET)
	install -d $(DESTDIR)$(PREFIX)/bin
	install -m 755 $(TARGET) $(DESTDIR)$(PREFIX)/bin
	install -d $(DESTDIR)$(MANDIR)
	install -m 644 chg.1 $(DESTDIR)$(MANDIR)

.PHONY: serve
serve:
	[ -d $(CHGSOCKDIR) ] || ( umask 077; mkdir $(CHGSOCKDIR) )
	$(HG) serve --cwd / --cmdserver chgunix \
		--address $(CHGSOCKNAME) \
		--config extensions.chgserver= \
		--config cmdserver.log=/dev/stderr

.PHONY: clean
clean:
	$(RM) $(OBJS)

.PHONY: distclean
distclean:
	$(RM) $(OBJS) $(TARGET)