Improve Makefile

Author: robertgzr

.gitignore

@@ -1,2 +1,3 @@
 porcelain
+porcelain.1
 dist/

Makefile

@@ -1,2 +1,37 @@
-all:
-	@go build -ldflags "-X main.date=`date -u '+%Y-%m-%d_%I:%M:%S%p'` -X main.commit=`git rev-parse --short HEAD` -X main.version=`git describe --tags --long`"
+.POSIX:
+.SUFFIXES:
+
+GO ?= go
+RM ?= rm
+SCDOC ?= scdoc
+
+REV ?= $(shell git rev-parse --short HEAD)
+VERSION ?= $(shell git describe --tags --long)
+
+GOFLAGS     =
+GO_LDFLAGS ?= -s -w
+GO_LDFLAGS += -X main.date=$(shell date -u -I) -X main.commit=$(REV) -X main.version=$(VERSION)
+
+.PHONY: all
+all: porcelain porcelain.1
+
+porcelain:
+	$(GO) build $(GOFLAGS) -ldflags "$(GO_LDFLAGS)"
+
+porcelain.1: porcelain.1.scd
+	$(SCDOC) < $< >$@
+
+PREFIX ?= /usr/local
+BINDIR ?= $(PREFIX)/bin
+MANDIR ?= $(PREFIX)/share/man
+
+.PHONY: install
+install: porcelain porcelain.1
+	mkdir -p $(DESTDIR)$(BINDIR)
+	mkdir -p $(DESTDIR)$(MANDIR)/man1
+	cp -f porcelain $(DESTDIR)$(BINDIR)
+	cp -f porcelain.1 $(DESTDIR)$(MANDIR)/man1
+
+.PHONY: clean
+clean:
+	$(RM) porcelain porcelain.1