commit efa2cc1

Support setting the version via -ldflags

Add a package-level version variable that can be stamped at build time
with -ldflags "-X git.sr.ht/~delthas/senpai.version=...", letting the
release script and package maintainers report a clean version. The
Makefile wires this through a VERSION variable.

BuildVersion now prefers the injected value and falls back to the build
info only when it carries a real version, so plain builds no longer
report "(devel)".

Fixes: https://todo.sr.ht/~delthas/senpai/206

 1@@ -7,6 +7,7 @@ INSTALL ?= install
 2 SCDOC ?= scdoc
 3 GIT ?= git
 4 GOFLAGS ?=
 5+VERSION ?=
 6 PREFIX ?= /usr/local
 7 BINDIR ?= bin
 8 MANDIR ?= share/man
 9@@ -20,7 +21,7 @@ endif
10 all: senpai doc
11 
12 senpai:
13-	$(GO) build $(GOFLAGS) ./cmd/senpai
14+	$(GO) build $(GOFLAGS) -ldflags "-X git.sr.ht/~delthas/senpai.version=$(VERSION)" ./cmd/senpai
15 
16 ifeq (, $(shell which $(SCDOC) 2>/dev/null))
17 $(warning "$(SCDOC) not found, skipping building documentation")

 1@@ -2750,12 +2750,17 @@ func dropBackslash(s string) string {
 2 	return sb.String()
 3 }
 4 
 5+// version is set via -ldflags "-X git.sr.ht/~delthas/senpai.version=...".
 6+var version string
 7+
 8 func BuildVersion() (string, bool) {
 9-	if bi, ok := debug.ReadBuildInfo(); ok {
10+	if version != "" {
11+		return version, true
12+	}
13+	if bi, ok := debug.ReadBuildInfo(); ok && bi.Main.Version != "" && bi.Main.Version != "(devel)" {
14 		return bi.Main.Version, true
15-	} else {
16-		return "", false
17 	}
18+	return "", false
19 }
20 
21 type ReadProgress struct {