108 lines
2.7 KiB
Go
108 lines
2.7 KiB
Go
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// Copyright 2016 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// +build ignore
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package main
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// This program generates the subdirectories of Go packages that contain []byte
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// versions of the TrueType font files under ./ttfs.
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//
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// Currently, "go run gen.go" needs to be run manually. This isn't done by the
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// usual "go generate" mechanism as there isn't any other Go code in this
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// directory (excluding sub-directories) to attach a "go:generate" line to.
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//
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// In any case, code generation should only need to happen when the underlying
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// TTF files change, which isn't expected to happen frequently.
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import (
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"bytes"
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"fmt"
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"go/format"
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"io/ioutil"
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"log"
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"os"
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"path/filepath"
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"strings"
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)
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const suffix = ".ttf"
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func main() {
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ttfs, err := os.Open("ttfs")
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if err != nil {
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log.Fatal(err)
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}
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defer ttfs.Close()
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infos, err := ttfs.Readdir(-1)
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if err != nil {
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log.Fatal(err)
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}
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for _, info := range infos {
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ttfName := info.Name()
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if !strings.HasSuffix(ttfName, suffix) {
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continue
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}
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do(ttfName)
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}
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}
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func do(ttfName string) {
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fontName := fontName(ttfName)
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pkgName := pkgName(ttfName)
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if err := os.Mkdir(pkgName, 0777); err != nil && !os.IsExist(err) {
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log.Fatal(err)
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}
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src, err := ioutil.ReadFile(filepath.Join("ttfs", ttfName))
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if err != nil {
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log.Fatal(err)
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}
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desc := "a proportional-width, sans-serif"
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if strings.Contains(ttfName, "Mono") {
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desc = "a fixed-width, slab-serif"
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}
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b := new(bytes.Buffer)
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fmt.Fprintf(b, "// generated by go run gen.go; DO NOT EDIT\n\n")
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fmt.Fprintf(b, "// Package %s provides the %q TrueType font\n", pkgName, fontName)
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fmt.Fprintf(b, "// from the Go font family. It is %s font.\n", desc)
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fmt.Fprintf(b, "//\n")
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fmt.Fprintf(b, "// See https://blog.golang.org/go-fonts for details.\n")
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fmt.Fprintf(b, "package %s\n\n", pkgName)
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fmt.Fprintf(b, "// TTF is the data for the %q TrueType font.\n", fontName)
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fmt.Fprintf(b, "var TTF = []byte{")
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for i, x := range src {
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if i&15 == 0 {
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b.WriteByte('\n')
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}
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fmt.Fprintf(b, "%#02x,", x)
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}
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fmt.Fprintf(b, "\n}\n")
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dst, err := format.Source(b.Bytes())
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if err != nil {
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log.Fatal(err)
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}
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if err := ioutil.WriteFile(filepath.Join(pkgName, "data.go"), dst, 0666); err != nil {
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log.Fatal(err)
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}
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}
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// fontName maps "Go-Regular.ttf" to "Go Regular".
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func fontName(ttfName string) string {
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s := ttfName[:len(ttfName)-len(suffix)]
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s = strings.Replace(s, "-", " ", -1)
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return s
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}
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// pkgName maps "Go-Regular.ttf" to "goregular".
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func pkgName(ttfName string) string {
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s := ttfName[:len(ttfName)-len(suffix)]
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s = strings.Replace(s, "-", "", -1)
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s = strings.ToLower(s)
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return s
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}
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