font/{liberation,lm},cmd/mtex-render: expose ttf.Fonts collections

cmd/mtex-render/fonts.go

@@ -18,69 +18,18 @@ import (
 	"github.com/go-fonts/liberation/liberationserifbolditalic"
 	"github.com/go-fonts/liberation/liberationserifitalic"
 	"github.com/go-fonts/liberation/liberationserifregular"
-	"golang.org/x/image/font/sfnt"
 
+	"github.com/go-latex/latex/font/liberation"
+	"github.com/go-latex/latex/font/lm"
 	"github.com/go-latex/latex/font/ttf"
 )
 
 func liberationFonts() *ttf.Fonts {
-	rm, err := sfnt.Parse(liberationserifregular.TTF)
-	if err != nil {
-		log.Fatalf("could not parse fonts: %+v", err)
-	}
-
-	it, err := sfnt.Parse(liberationserifitalic.TTF)
-	if err != nil {
-		log.Fatalf("could not parse fonts: %+v", err)
-	}
-
-	bf, err := sfnt.Parse(liberationserifbold.TTF)
-	if err != nil {
-		log.Fatalf("could not parse fonts: %+v", err)
-	}
-
-	bfit, err := sfnt.Parse(liberationserifbolditalic.TTF)
-	if err != nil {
-		log.Fatalf("could not parse fonts: %+v", err)
-	}
-
-	return &ttf.Fonts{
-		Default: rm,
-		Rm:      rm,
-		It:      it,
-		Bf:      bf,
-		BfIt:    bfit,
-	}
+	return liberation.Fonts()
 }
 
 func lmromanFonts() *ttf.Fonts {
-	rm, err := sfnt.Parse(lmromanregular.TTF)
-	if err != nil {
-		log.Fatalf("could not parse fonts: %+v", err)
-	}
-
-	it, err := sfnt.Parse(lmromanitalic.TTF)
-	if err != nil {
-		log.Fatalf("could not parse fonts: %+v", err)
-	}
-
-	bf, err := sfnt.Parse(lmromanbold.TTF)
-	if err != nil {
-		log.Fatalf("could not parse fonts: %+v", err)
-	}
-
-	bfit, err := sfnt.Parse(lmromanbolditalic.TTF)
-	if err != nil {
-		log.Fatalf("could not parse fonts: %+v", err)
-	}
-
-	return &ttf.Fonts{
-		Default: rm,
-		Rm:      rm,
-		It:      it,
-		Bf:      bf,
-		BfIt:    bfit,
-	}
+	return lm.Fonts()
 }
 
 func registerFont(fnt text.Font, name string, raw []byte) text.FontFace {

font/liberation/liberation.go

@@ -0,0 +1,58 @@
+// Copyright ©2021 The go-latex Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package liberation provides a ttf.Fonts value populated with Liberation fonts.
+package liberation // import "github.com/go-latex/latex/font/liberation"
+
+import (
+	"log"
+	"sync"
+
+	"github.com/go-fonts/liberation/liberationserifbold"
+	"github.com/go-fonts/liberation/liberationserifbolditalic"
+	"github.com/go-fonts/liberation/liberationserifitalic"
+	"github.com/go-fonts/liberation/liberationserifregular"
+	"golang.org/x/image/font/sfnt"
+
+	"github.com/go-latex/latex/font/ttf"
+)
+
+var (
+	once sync.Once
+	fnts *ttf.Fonts
+)
+
+// Fonts returns a ttf.Fonts value populated with Liberation fonts.
+func Fonts() *ttf.Fonts {
+	once.Do(func() {
+		rm, err := sfnt.Parse(liberationserifregular.TTF)
+		if err != nil {
+			log.Panicf("could not parse fonts: %+v", err)
+		}
+
+		it, err := sfnt.Parse(liberationserifitalic.TTF)
+		if err != nil {
+			log.Panicf("could not parse fonts: %+v", err)
+		}
+
+		bf, err := sfnt.Parse(liberationserifbold.TTF)
+		if err != nil {
+			log.Panicf("could not parse fonts: %+v", err)
+		}
+
+		bfit, err := sfnt.Parse(liberationserifbolditalic.TTF)
+		if err != nil {
+			log.Panicf("could not parse fonts: %+v", err)
+		}
+
+		fnts = &ttf.Fonts{
+			Default: rm,
+			Rm:      rm,
+			It:      it,
+			Bf:      bf,
+			BfIt:    bfit,
+		}
+	})
+	return fnts
+}

font/lm/lm.go

@@ -0,0 +1,60 @@
+// Copyright ©2021 The go-latex Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package lm provides a ttf.Fonts value populated with latin-modern,
+// a LaTeX-looking font.
+package lm // import "github.com/go-latex/latex/font/lm"
+
+import (
+	"log"
+	"sync"
+
+	lmromanbold "github.com/go-fonts/latin-modern/lmroman10bold"
+	lmromanbolditalic "github.com/go-fonts/latin-modern/lmroman10bolditalic"
+	lmromanitalic "github.com/go-fonts/latin-modern/lmroman10italic"
+	lmromanregular "github.com/go-fonts/latin-modern/lmroman10regular"
+	"golang.org/x/image/font/sfnt"
+
+	"github.com/go-latex/latex/font/ttf"
+)
+
+var (
+	once sync.Once
+	fnts *ttf.Fonts
+)
+
+// Fonts returns a ttf.Fonts value populated with latin-modern fonts.
+func Fonts() *ttf.Fonts {
+	once.Do(func() {
+		rm, err := sfnt.Parse(lmromanregular.TTF)
+		if err != nil {
+			log.Panicf("could not parse fonts: %+v", err)
+		}
+
+		it, err := sfnt.Parse(lmromanitalic.TTF)
+		if err != nil {
+			log.Panicf("could not parse fonts: %+v", err)
+		}
+
+		bf, err := sfnt.Parse(lmromanbold.TTF)
+		if err != nil {
+			log.Panicf("could not parse fonts: %+v", err)
+		}
+
+		bfit, err := sfnt.Parse(lmromanbolditalic.TTF)
+		if err != nil {
+			log.Panicf("could not parse fonts: %+v", err)
+		}
+
+		fnts = &ttf.Fonts{
+			Default: rm,
+			Rm:      rm,
+			It:      it,
+			Bf:      bf,
+			BfIt:    bfit,
+		}
+	})
+
+	return fnts
+}