212 lines
5.4 KiB
Markdown
212 lines
5.4 KiB
Markdown
# | extended terminal format |
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[](https://golang.org/doc/go1.11)
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[](https://goreportcard.com/report/git.xdrm.io/go/clifmt)
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[](https://godoc.org/git.xdrm.io/go/clifmt)
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[](https://drone.xdrm.io/go/clifmt)
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Simple utility written in `go` that extends the standard `fmt.Sprintf` and `fmt.Printf` functions. It allows you to set foreground/background color, **bold**, <u>underlined</u>, _italic_ text and [hyperlinks](some-url).
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<!-- toc -->
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- [I. How to use](#i-how-to-use)
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* [1) Requirements](#1-requirements)
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* [2) Installation](#2-installation)
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* [3) Usage](#3-usage)
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+ [a) As a library](#a-as-a-library)
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+ [b) As an executable](#b-as-an-executable)
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- [II. Format syntax](#ii-format-syntax)
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* [1) Text style](#1-text-style)
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- [III. Animations](#iii-animations)
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- [IV. Screenshots](#iv-screenshots)
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* [Colorizing format example :](#colorizing-format-example-)
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* [Markdown-like format example](#markdown-like-format-example)
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- [V. Incoming features](#v-incoming-features)
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<!-- tocstop -->
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----
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## I. How to use
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### 1) Requirements
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The package **clifmt** can be used as a `go` library or as an executable. In either case, you need :
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- any recent linux system (_has not been tested over other OSes_)
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- `go` installed (_has not been tested under version **1.11**_)
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### 2) Installation
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Simply launch the following command in your favorite terminal
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```bash
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$ go get -u git.xdrm.io/go/clifmt
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```
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> It will download the project sources into _`$GOPATH`/src/git.xdrm.io/go/clifmt_.
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### 3) Usage
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#### a) As a library
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You must import the library into your program with
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```go
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import "git.xdrm.io/go/clifmt"
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```
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Then, the following methods will be available
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```go
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// Printf wraps the standard fmt.Printf() features but adds formatting capabilities
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func Printf(fmt string, args ...interface{}) error
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```
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```go
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// Sprintf acts as 'Printf' but returns the string instead of printing it
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func Sprintf(fmt string, args ...interface{}) (string, error)
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```
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```go
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// Printpf acts as 'Printf' but takes as arguments either standard fmt.Printf arguments, or channels that will update the output when provided with correct values.
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func Printpf(fmt string, args ...interface{}) (error)
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```
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#### b) As an executable
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You must run from your terminal
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```bash
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$ go get -u git.xdrm.io/go/clifmt/cmd/clifmt
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```
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The `clifmt` executable will be available in your $GOBIN directory.
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> WARNING: The executable tool is a Work In Progress, it is not stable for now. You can use `clifmt --help` anyway to see details on the format, coloring, etc.
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----
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## II. Format syntax
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### 1) Text style
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The format has been designed with the markdown syntax in mind, but has some differences due to implementation issues and for stability.
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The format is better described by the sample below than explanations :
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```go
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// markdown-like
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Printf("some normal text")
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Printf("**some bold text**")
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Printf("*some italic text*")
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Printf("_some underline text_")
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Printf("[link label](http://link_url)")
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// colors
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Printf("${red text}(red)")
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Printf("${red text over blue background}(red:blue)")
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Printf("${blue background text}(:blue)")
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```
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The code below will print the following result :
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> Any syntax feature (_e.g. bold, color, hyperlink, ..._) can be included in any other. In the same way any syntax feature can be interlaced (_e.g. "startA startB stopA stopB"_) with each other.
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> Note that there can be some issues with interlaced hyperlinks as it is supported as other syntax features. But it works perfectly when used alone.
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> Color names (_e.g. **red**, **blue**_) can be replaced by their hexadecimal representation (_e.g. **#ff0000**, **#0000ff**_) or the short version (_e.g. **#f00**, **#00f**_).
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----
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## III. Animations
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The **Printpf** method allows you to pass [channels](https://tour.golang.org/concurrency/2) among ordinary arguments. It allows you to animate the text you want to print each time you send data on a channel argument.
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The example below shows a simple progress bar using markdown-like syntax, colors and animations :
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```go
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package main
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import (
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"git.xdrm.io/go/clifmt"
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"time"
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)
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func main() {
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// (1) animated values
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var (
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status = make(chan interface{})
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color = make(chan interface{})
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progress = make(chan interface{})
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)
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// (2) print your animated values
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go clifmt.Printpf("[${%s}(%s)] **%d**%%", status, color, progress)
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// (3) animate values
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status <- "download"
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color <- "red"
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for i := 0; i < 100; i++ {
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progress <- i
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time.Sleep(time.Millisecond * 200)
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}
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status <- "done"
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color <- "green"
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}
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```
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The result is the following :
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----
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## IV. Screenshots
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###### Colorizing format example :
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###### Markdown-like format example
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----
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## V. Incoming features
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- [x] **markdown-like formatting** - bold, italic, underlined, (strike-through?)
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- [ ] **command-line executable** - align text from terminal
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- [ ] **global alignment** - align text dynamically
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- [x] **progress-line** - redrawing format to show, for instance an animated progress bar on the same line
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