font/gofont: new packages for the Go font family.

See https://blog.golang.org/go-fonts for details.

Change-Id: Ib7219ace9ffe49115d975439b85237472167a1c1
Reviewed-on: https://go-review.googlesource.com/33335
Reviewed-by: Rob Pike <r@golang.org>

font/gofont/gen.go

@@ -0,0 +1,99 @@
+// Copyright 2016 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build ignore
+
+package main
+
+// This program generates the subdirectories of Go packages that contain []byte
+// versions of the TrueType font files under ./ttfs.
+//
+// Currently, "go run gen.go" needs to be run manually. This isn't done by the
+// usual "go generate" mechanism as there isn't any other Go code in this
+// directory (excluding sub-directories) to attach a "go:generate" line to.
+//
+// In any case, code generation should only need to happen when the underlying
+// TTF files change, which isn't expected to happen frequently.
+
+import (
+	"bytes"
+	"fmt"
+	"go/format"
+	"io/ioutil"
+	"log"
+	"os"
+	"path/filepath"
+	"strings"
+)
+
+const suffix = ".ttf"
+
+func main() {
+	ttfs, err := os.Open("ttfs")
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer ttfs.Close()
+
+	infos, err := ttfs.Readdir(-1)
+	if err != nil {
+		log.Fatal(err)
+	}
+	for _, info := range infos {
+		ttfName := info.Name()
+		if !strings.HasSuffix(ttfName, suffix) {
+			continue
+		}
+		do(ttfName)
+	}
+}
+
+func do(ttfName string) {
+	fontName := fontName(ttfName)
+	pkgName := pkgName(ttfName)
+	if err := os.Mkdir(pkgName, 0777); err != nil && !os.IsExist(err) {
+		log.Fatal(err)
+	}
+	src, err := ioutil.ReadFile(filepath.Join("ttfs", ttfName))
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	b := new(bytes.Buffer)
+	fmt.Fprintf(b, "// generated by go run gen.go; DO NOT EDIT\n\n")
+	fmt.Fprintf(b, "// Package %s provides the %q TrueType font\n// from the Go font family.\n", pkgName, fontName)
+	fmt.Fprintf(b, "package %s\n\n", pkgName)
+	fmt.Fprintf(b, "// TTF is the data for the %q TrueType font.\n", fontName)
+	fmt.Fprintf(b, "var TTF = []byte{")
+	for i, x := range src {
+		if i&15 == 0 {
+			b.WriteByte('\n')
+		}
+		fmt.Fprintf(b, "%#02x,", x)
+	}
+	fmt.Fprintf(b, "\n}\n")
+
+	dst, err := format.Source(b.Bytes())
+	if err != nil {
+		log.Fatal(err)
+	}
+	if err := ioutil.WriteFile(filepath.Join(pkgName, "data.go"), dst, 0666); err != nil {
+		log.Fatal(err)
+	}
+}
+
+// fontName maps "Go-Regular.ttf" to "Go Regular".
+func fontName(ttfName string) string {
+	s := ttfName[:len(ttfName)-len(suffix)]
+	s = strings.Replace(s, "-", " ", -1)
+	return s
+}
+
+// pkgName maps "Go-Regular.ttf" to "goregular".
+func pkgName(ttfName string) string {
+	s := ttfName[:len(ttfName)-len(suffix)]
+	s = strings.Replace(s, "-", "", -1)
+	s = strings.ToLower(s)
+	return s
+}

font/gofont/ttfs/README

@@ -0,0 +1,36 @@
+These fonts were created by the Bigelow & Holmes foundry specifically for the
+Go project. See https://blog.golang.org/go-fonts for details.
+
+They are licensed under the same open source license as the rest of the Go
+project's software:
+
+Copyright (c) 2016 Bigelow & Holmes Inc.. All rights reserved.
+
+Distribution of this font is governed by the following license. If you do not
+agree to this license, including the disclaimer, do not distribute or modify
+this font.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+	* Redistributions of source code must retain the above copyright notice,
+	  this list of conditions and the following disclaimer.
+
+	* Redistributions in binary form must reproduce the above copyright notice,
+	  this list of conditions and the following disclaimer in the documentation
+	  and/or other materials provided with the distribution.
+
+	* Neither the name of Google Inc. nor the names of its contributors may be
+	  used to endorse or promote products derived from this software without
+	  specific prior written permission.
+
+DISCLAIMER: THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
+FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.