update

font.go

@@ -0,0 +1,127 @@
+package figlet4go
+
+import (
+	"errors"
+	"io/ioutil"
+	"os"
+	"path/filepath"
+	"strconv"
+	"strings"
+)
+
+type font struct {
+	hardblank string
+	height    int
+	fontSlice []string
+}
+
+type fontManager struct {
+	// font library
+	fontLib map[string]*font
+
+	// font name to path
+	fontList map[string]string
+}
+
+func newFontManager() *fontManager {
+	this := &fontManager{}
+
+	this.fontLib = make(map[string]*font)
+	this.fontList = make(map[string]string)
+	this.loadBuildInFont()
+
+	return this
+}
+
+// walk through the path, load all the *.flf font file
+func (this *fontManager) loadFont(fontPath string) error {
+
+	return filepath.Walk(fontPath, func(path string, info os.FileInfo, err error) error {
+		if err != nil {
+			return err
+		}
+
+		if info.IsDir() || !strings.HasSuffix(info.Name(), ".flf") {
+			return nil
+		}
+
+		fontName := strings.TrimSuffix(info.Name(), ".flf")
+		this.fontList[fontName] = path
+		return nil
+	})
+}
+
+func (this *fontManager) loadBuildInFont() error {
+	font, err := this.parseFontContent(buildInFont())
+	if err != nil {
+		return err
+	}
+	this.fontLib["default"] = font
+	return nil
+}
+
+func (this *fontManager) loadDiskFont(fontName string) error {
+
+	fontFilePath, ok := this.fontList[fontName]
+	if !ok {
+		return errors.New("FontName Not Found.")
+	}
+
+	// read full file content
+	fileBuf, err := ioutil.ReadFile(fontFilePath)
+	if err != nil {
+		return err
+	}
+
+	font, err := this.parseFontContent(string(fileBuf))
+	if err != nil {
+		return err
+	}
+
+	this.fontLib[fontName] = font
+	return nil
+}
+
+func (this *fontManager) parseFontContent(cont string) (*font, error) {
+	lines := strings.Split(cont, "\n")
+	if len(lines) < 1 {
+		return nil, errors.New("font content error")
+	}
+
+	// flf2a$ 7 5 16 -1 12
+	// Fender by Scooter 8/94 (jkratten@law.georgetown.edu)
+	//
+	// Explanation of first line:
+	// flf2 - "magic number" for file identification
+	// a    - should always be `a', for now
+	// $    - the "hardblank" -- prints as a blank, but can't be smushed
+	// 7    - height of a character
+	// 5    - height of a character, not including descenders
+	// 10   - max line length (excluding comment lines) + a fudge factor
+	// -1   - default smushmode for this font (like "-m 15" on command line)
+	// 12   - number of comment lines
+
+	header := strings.Split(lines[0], " ")
+
+	font := &font{}
+	font.hardblank = header[0][len(header)-1:]
+	font.height, _ = strconv.Atoi(header[1])
+
+	commentEndLine, _ := strconv.Atoi(header[5])
+	font.fontSlice = lines[commentEndLine+1:]
+
+	return font, nil
+}
+
+func (this *fontManager) getFont(fontName string) (*font, error) {
+	font, ok := this.fontLib[fontName]
+	if !ok {
+		err := this.loadDiskFont(fontName)
+		if err != nil {
+			font, _ := this.fontLib["default"]
+			return font, nil
+		}
+	}
+	font, _ = this.fontLib[fontName]
+	return font, nil
+}