git clone https://git.lucas.co/go_mono.git
font/gofont/gen.go (2.7K)
1 // Copyright 2016 The Go Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style
3 // license that can be found in the LICENSE file.
4
5 //go:build ignore
6 // +build ignore
7
8 package main
9
10 // This program generates the subdirectories of Go packages that contain []byte
11 // versions of the TrueType font files under ./ttfs.
12 //
13 // Currently, "go run gen.go" needs to be run manually. This isn't done by the
14 // usual "go generate" mechanism as there isn't any other Go code in this
15 // directory (excluding sub-directories) to attach a "go:generate" line to.
16 //
17 // In any case, code generation should only need to happen when the underlying
18 // TTF files change, which isn't expected to happen frequently.
19
20 import (
21 "bytes"
22 "fmt"
23 "go/format"
24 "io/ioutil"
25 "log"
26 "os"
27 "path/filepath"
28 "strings"
29 )
30
31 const suffix = ".ttf"
32
33 func main() {
34 ttfs, err := os.Open("ttfs")
35 if err != nil {
36 log.Fatal(err)
37 }
38 defer ttfs.Close()
39
40 infos, err := ttfs.Readdir(-1)
41 if err != nil {
42 log.Fatal(err)
43 }
44 for _, info := range infos {
45 ttfName := info.Name()
46 if !strings.HasSuffix(ttfName, suffix) {
47 continue
48 }
49 do(ttfName)
50 }
51 }
52
53 func do(ttfName string) {
54 fontName := fontName(ttfName)
55 pkgName := pkgName(ttfName)
56 if err := os.Mkdir(pkgName, 0777); err != nil && !os.IsExist(err) {
57 log.Fatal(err)
58 }
59 src, err := ioutil.ReadFile(filepath.Join("ttfs", ttfName))
60 if err != nil {
61 log.Fatal(err)
62 }
63
64 desc := "a proportional-width, sans-serif"
65 if strings.Contains(ttfName, "Mono") {
66 desc = "a fixed-width, slab-serif"
67 }
68
69 b := new(bytes.Buffer)
70 fmt.Fprintf(b, "// generated by go run gen.go; DO NOT EDIT\n\n")
71 fmt.Fprintf(b, "// Package %s provides the %q TrueType font\n", pkgName, fontName)
72 fmt.Fprintf(b, "// from the Go font family. It is %s font.\n", desc)
73 fmt.Fprintf(b, "//\n")
74 fmt.Fprintf(b, "// See https://blog.golang.org/go-fonts for details.\n")
75 fmt.Fprintf(b, "package %s\n\n", pkgName)
76 fmt.Fprintf(b, "// TTF is the data for the %q TrueType font.\n", fontName)
77 fmt.Fprintf(b, "var TTF = []byte{")
78 for i, x := range src {
79 if i&15 == 0 {
80 b.WriteByte('\n')
81 }
82 fmt.Fprintf(b, "%#02x,", x)
83 }
84 fmt.Fprintf(b, "\n}\n")
85
86 dst, err := format.Source(b.Bytes())
87 if err != nil {
88 log.Fatal(err)
89 }
90 if err := ioutil.WriteFile(filepath.Join(pkgName, "data.go"), dst, 0666); err != nil {
91 log.Fatal(err)
92 }
93 }
94
95 // fontName maps "Go-Regular.ttf" to "Go Regular".
96 func fontName(ttfName string) string {
97 s := ttfName[:len(ttfName)-len(suffix)]
98 s = strings.Replace(s, "-", " ", -1)
99 return s
100 }
101
102 // pkgName maps "Go-Regular.ttf" to "goregular".
103 func pkgName(ttfName string) string {
104 s := ttfName[:len(ttfName)-len(suffix)]
105 s = strings.Replace(s, "-", "", -1)
106 s = strings.ToLower(s)
107 return s
108 }