feat: translation support

See toolshed/abra#483

Makefile

@@ -6,6 +6,10 @@ GOVERSION    := 1.24
 LDFLAGS      := "-X 'main.Commit=$(COMMIT)'"
 DIST_LDFLAGS := $(LDFLAGS)" -s -w"
 GCFLAGS      := "all=-l -B"
+DOMAIN       := abra
+POFILES      := $(wildcard pkg/i18n/locales/*.po)
+MOFILES      := $(patsubst %.po,%.mo,$(POFILES))
+LINGUAS      := $(basename $(POFILES))
 
 export GOPRIVATE=coopcloud.tech
 
@@ -59,3 +63,32 @@ loc:
 
 deps:
 	@go get -t -u ./...
+
+.PHONY: i18n
+i18n: update-pot update-pot-po-metadata update-po build-mo
+
+.PHONY: update-po
+update-po:
+	@set -eu; \
+	for lang in $(LINGUAS); do \
+		msgmerge --backup=none -U $$lang.po pkg/i18n/locales/$(DOMAIN).pot; \
+	done
+
+.PHONY: update-pot
+update-pot:
+	@xgettext-go \
+		-o pkg/i18n/locales/$(DOMAIN).pot \
+		--keyword=i18n.G \
+		--sort-output \
+		$$(find . -name "*.go" -not -path "*vendor*")
+
+.PHONY: update-pot-po-metadata
+update-pot-po-metadata:
+	@sed -i "s/charset=CHARSET/charset=UTF-8/g" pkg/i18n/locales/*.po*
+
+.PHONY: build-mo
+build-mo:
+	@set -eu; \
+	for lang in $(POFILES); do \
+		msgfmt $$lang -o $$(echo $$lang | sed 's/.po/.mo/g') --statistics; \
+	done