https://github.com/abiosoft/lineprefix
io.Writer wrapper with line prefix and color customizations.
https://github.com/abiosoft/lineprefix
color log prefix writer
Last synced: 3 months ago
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io.Writer wrapper with line prefix and color customizations.
- Host: GitHub
- URL: https://github.com/abiosoft/lineprefix
- Owner: abiosoft
- License: mit
- Created: 2021-06-01T21:24:30.000Z (about 5 years ago)
- Default Branch: main
- Last Pushed: 2021-06-03T10:50:32.000Z (about 5 years ago)
- Last Synced: 2025-04-11T00:34:21.976Z (about 1 year ago)
- Topics: color, log, prefix, writer
- Language: Go
- Homepage: https://godocs.io/github.com/abiosoft/lineprefix
- Size: 253 KB
- Stars: 13
- Watchers: 2
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- License: LICENSE
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README
# lineprefix
[](https://godocs.io/github.com/abiosoft/lineprefix)
[](https://github.com/abiosoft/lineprefix/actions/workflows/go.yml)
`io.Writer` wrapper with line prefix and color customizations.
## Usage
### Static Prefix
```go
prefix := lineprefix.Prefix("app |")
writer := lineprefix.New(prefix)
fmt.Fprintln(writer, "hello world")
```
output
```
app | hello world
```
### Dynamic Prefix
```go
now := func() string { return time.Now().UTC().Format("2006-01-02 15:04:05") }
prefix := lineprefix.PrefixFunc(now)
writer := lineprefix.New(prefix)
for i := 0; i<3; i++ {
fmt.Fprintln(writer, "hello world")
time.Sleep(time.Second)
}
```
output
```
2021-06-01 18:53:15 hello world
2021-06-01 18:53:16 hello world
2021-06-01 18:53:17 hello world
```
### Color
Colors can be added with [fatih/color](https://github.com/fatih/color).
#### Colored Prefix
A prefix with blue text on white background.
```go
blue := color.New(color.FgBlue, color.BgWhite).SprintFunc()
prefix := lineprefix.Prefix(blue("app"))
writer := lineprefix.New(prefix)
fmt.Fprintln(writer, "this outputs blue on white prefix text")
```
#### Colored Output
A blue colored output.
```go
blue := color.New(color.FgBlue)
option := lineprefix.Color(blue)
writer := lineprefix.New(option)
fmt.Fprintln(writer, "this outputs blue color text")
```
### Example
The example file has an overview of the capabilities.
```
go run example/main.go
```
## Screenshot
colored prefix and colored text from the [example](example/main.go).
## License
MIT