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probandula
2016-10-26 18:32:11 +02:00
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64
README.md
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@@ -1,8 +1,5 @@
# FIGlet for Go
**Currently in Development.
Sould work but will be improved (add demos, better font adding, maybe better performance, more default fonts)**
A port of [figlet](http://www.figlet.org/) to golang and fork of [getwe/figlet4go](https://github.com/getwe/figlet4go).
![screenshot](./screenshot/figlet4go.png)
@@ -14,21 +11,70 @@ go get -u github.com/probandula/figlet4go
```
## Usage
### Basic
You have to create a renderer (`ascii`) and let it render the desired string through the `Render` method. After that you can simply print the returned string.
```go
// Create the renderer
ascii := figlet4go.NewAsciiRender()
// Optional: Add color to the letters (https://github.com/fatih/color needed)
// Render and print the string
renderStr, _ := ascii.Render("Hello World")
fmt.Print(renderStr)
```
## Default font
The default font is built into the `bindata.go` file with the tool [go-bindata](https://github.com/jteeuwen/go-bindata).
### Colored
The colors given in the `[]color.Attribute` slice are repeating if the string is longer than the slice. You have to call the `RenderOpts` instead of the `Render` method to give the Renderer the Options.
```go
ascii := figlet4go.NewAsciiRender()
// Adding the colors to RenderOptions
options := figlet4go.NewRenderOptions()
options.FontColor = []color.Attribute{
color.FgGreen,
color.FgYellow,
color.FgCyan,
}
renderStr, _ := ascii.RenderOpts("Hello Colors", options)
fmt.Print(renderStr)
```
### Other font
If you want to use another font, you have to specify the name of the font as in this example.
Is the font you want to use not [included](#builtin) you have to load the font manually with the `LoadFont` method. This method will walk the path recursively and load all `.flf` files
```go
ascii := figlet4go.NewAsciiRender()
options := figlet4go.NewRenderOptions()
options.FontName = "larry3d"
// If 'larry3d' wouldn't be included you would have to load your .flf files like that:
ascii.LoadFont("/path/to/fonts/")
renderStr, _ := ascii.RenderOpts("Hello Colors", options)
fmt.Print(renderStr)
```
## Fonts
### Bulitin
The builtin fonts are built into the `bindata.go` file with the tool [go-bindata](https://github.com/jteeuwen/go-bindata).
The bash script for building the default font is stored in `tools/` (`go-bindata` must be installed).
The default font is `standard`. All builtin fonts are listed here:
| Font name | Source |
| --- | --- |
| standard | http://www.figlet.org/fontdb_example.cgi?font=standard.flf |
| larry3d | http://www.figlet.org/fontdb_example.cgi?font=larry3d.flf |
### Other fonts
Other fonts can mainly be found on [figlet](http://www.figlet.org). You have to load them as in [this example](#other-fonts).
## Use the demo
There are [demo](https://github.com/probandula/figlet4go/blob/master/demo) programs for trying out the library.
To run them, `cd` into the `demo/` directory and run `go run [filename]` on any program you want to run.
## Todo
- [ ] automatic the perfect char margin
- [ ] Linebreak possible?

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assets/larry3d.flf Normal file
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flf2a$ 9 6 30 1 5
larry3d.flf by Larry Gelberg (larryg@avs.com)
(stolen liberally from Juan Car's puffy.flf)
tweaked by Glenn Chappell <ggc@uiuc.edu>
Version 1.2 2/24/94
$$$ @
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@@

23
bindata.go
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44
char.go Normal file
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@@ -0,0 +1,44 @@
package figlet4go
import (
"errors"
"strings"
"github.com/fatih/color"
)
type AsciiChar struct {
// Slice with the lines of the Char
Lines []string
// Color of the char
Color color.Attribute
}
func NewAsciiChar(font *font, char rune) (*AsciiChar, error) {
// If not ascii, throw an error
if char < 0 || char > 127 {
return nil, errors.New("Not Ascii")
}
height := font.height
beginRow := (int(char) - 32) * height
lines := make([]string, height)
for i := 0; i < height; i++ {
row := font.fontSlice[beginRow + i]
row = strings.Replace(row, "@", "", -1)
row = strings.Replace(row, font.hardblank, " ", -1)
lines[i] = row
}
return &AsciiChar{Lines: lines}, nil
}
// Return a line of the char as string with color if set
func (char *AsciiChar) GetLine(index int) string {
if char.Color != 0 {
colorFunc := color.New(char.Color).SprintFunc()
return colorFunc(char.Lines[index])
}
return char.Lines[index]
}

31
demo/colored.go
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@@ -1 +1,32 @@
// Print a colored string with the 'standard' figlet font
package main
import (
"fmt"
"github.com/probandula/figlet4go"
// This package is used to define the colors
"github.com/fatih/color"
)
const str string = "Colored"
func main() {
ascii := figlet4go.NewAsciiRender()
// Add the colors to the options
options := figlet4go.NewRenderOptions()
options.FontColor = []color.Attribute{
color.FgGreen,
color.FgYellow,
color.FgCyan,
}
// Use the RenderOpts instead of the Render method
renderStr, err := ascii.RenderOpts(str, options)
if err != nil {
panic(err)
}
fmt.Print(renderStr)
}

5
demo/default.go
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@@ -15,7 +15,10 @@ func main() {
ascii := figlet4go.NewAsciiRender()
// Render the string
renderStr, _ := ascii.Render(str)
renderStr, err := ascii.Render(str)
if err != nil {
panic(err)
}
// Print the string
fmt.Print(renderStr)

24
demo/otherfont.go
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@@ -1,5 +1,27 @@
// Print a string with another font
package main
func main() {
import (
"fmt"
"github.com/probandula/figlet4go"
)
const str string = "otherfont"
func main() {
ascii := figlet4go.NewAsciiRender()
// Add the font name to the options
options := figlet4go.NewRenderOptions()
// This font is included so you don't have to specify a path with 'ascii.LoadFont(/path/to/fonts/)'
options.FontName = "larry3d"
// Use the RenderOpts instead of the Render method
renderStr, err := ascii.RenderOpts(str, options)
if err != nil {
panic(err)
}
fmt.Print(renderStr)
}

25
font.go
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@@ -57,16 +57,26 @@ func (this *fontManager) loadFont(fontPath string) error {
// Load the default font
func (this *fontManager) loadBuildInFont() error {
fontStr, err := Asset("standard.flf")
if err != nil {
panic(err)
// Default fonts to load
defaultFonts := []string{
"standard",
"larry3d",
}
font, err := this.parseFontContent(string(fontStr))
if err != nil {
return err
// Load each default font
for _, name := range defaultFonts {
fontStr, err := Asset(name + ".flf")
if err != nil {
return err
}
font, err := this.parseFontContent(string(fontStr))
if err != nil {
return err
}
this.fontLib[name] = font
}
this.fontLib[defaultFontName] = font
return nil
}
@@ -126,6 +136,7 @@ func (this *fontManager) parseFontContent(cont string) (*font, error) {
}
// Get a font by name
// Better error handling. Why is there one in the return if not used?
func (this *fontManager) getFont(fontName string) (*font, error) {
font, ok := this.fontLib[fontName]
if !ok {

85
render.go
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@@ -1,10 +1,7 @@
package figlet4go
import (
"errors"
"fmt"
"github.com/fatih/color"
"strings"
)
// RenderOptions are used to set color or maybe future
@@ -43,67 +40,65 @@ func (ar *AsciiRender) LoadFont(fontPath string) error {
}
// Render a string with the default options
// Calls the RenderOpts method with a new RenderOptions object
func (ar *AsciiRender) Render(str string) (string, error) {
return ar.render(str, NewRenderOptions())
return ar.RenderOpts(str, NewRenderOptions())
}
// Render a string with special RenderOptions
func (ar *AsciiRender) RenderOpts(str string, opts *RenderOptions) (string, error) {
return ar.render(str, opts)
}
// Can be called from the user (if options wished) or the above Render method
// Contains the whole rendering logic
func (ar *AsciiRender) RenderOpts(str string, opt *RenderOptions) (string, error) {
colored := len(opt.FontColor) > 0
func (this *AsciiRender) convertChar(font *font, char rune) ([]string, error) {
if char < 0 || char > 127 {
return nil, errors.New("Not Ascii")
// Load the font
font, err := ar.fontMgr.getFont(opt.FontName)
if err != nil {
return "", err
}
height := font.height
begintRow := (int(char) - 32) * height
// Slice holding the chars
chars := []*AsciiChar{}
word := make([]string, height, height)
// Index of the current color
curColorIndex := 0
for i := 0; i < height; i++ {
row := font.fontSlice[begintRow+i]
row = strings.Replace(row, "@", "", -1)
row = strings.Replace(row, font.hardblank, " ", -1)
word[i] = row
}
return word, nil
}
func (this *AsciiRender) render(asciiStr string, opt *RenderOptions) (string, error) {
font, _ := this.fontMgr.getFont(opt.FontName)
wordlist := make([][]string, 0)
for _, char := range asciiStr {
word, err := this.convertChar(font, char)
// Foreach char create the ascii char
for _, char := range str {
// AsciiChar
asciiChar, err := NewAsciiChar(font, char)
if err != nil {
return "", err
}
wordlist = append(wordlist, word)
// Set color if given
if colored {
// Start colors from beginning if length is reached
if curColorIndex == len(opt.FontColor) {
curColorIndex = 0
}
// Assign color and increment the index
asciiChar.Color = opt.FontColor[curColorIndex]
curColorIndex++
}
// Append the char to the chars slice
chars = append(chars, asciiChar)
}
// Result which will be returned
result := ""
wordColorFunc := make([]func(a ...interface{}) string, len(wordlist))
for i, _ := range wordColorFunc {
if i < len(opt.FontColor) {
wordColorFunc[i] = color.New(opt.FontColor[i]).SprintFunc()
} else {
wordColorFunc[i] = fmt.Sprint
}
}
for i := 0; i < font.height; i++ {
for j := 0; j < len(wordlist); j++ {
result += wordColorFunc[j]((wordlist[j][i]))
// Foreach line of the font height
for curLine := 0; curLine < font.height; curLine++ {
// Add the current line of the char to the result
for i, _ := range chars {
result += chars[i].GetLine(curLine)
}
// A new line at the end
result += "\n"
}
return result, nil
}