8000 Allow `levelColor` template function to parse numbers by hogklint · Pull Request #321 · stern/stern · GitHub
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Allow levelColor template function to parse numbers #321

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Merged
merged 3 commits into from
Nov 14, 2024
Merged

Allow levelColor template function to parse numbers #321

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7bf0645
Add bunyanLevelColor for colorizing numeric levels
hogklint Nov 9, 2024
f40f85f
Document template function bunyanLevelColor
hogklint Nov 12, 2024
b69fed5
Return empty string from levelColor on non-string values
hogklint Nov 13, 2024
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1 change: 1 addition & 0 deletions README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -168,6 +168,7 @@ functions](https://golang.org/pkg/text/template/#hdr-Functions)):
| `toRFC3339Nano` | `object` | Parse timestamp (string, int, json.Number) and output it using RFC3339Nano format |
| `toTimestamp` | `object, string [, string]` | Parse timestamp (string, int, json.Number) and output it using the given layout in the timezone that is optionally given (defaults to UTC). |
| `levelColor` | `string` | Print log level using appropriate color |
| `bunyanLevelColor` | `string` | Print [bunyan](https://github.com/trentm/node-bunyan) numeric log level using appropriate color |
| `colorBlack` | `string` | Print text using black color |
| `colorRed` | `string` | Print text using red color |
| `colorGreen` | `string` | Print text using green color |
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74 changes: 57 additions & 17 deletions cmd/cmd.go
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Expand Up @@ -610,31 +610,71 @@ func (o *options) generateTemplate() (*template.Template, error) {
"colorMagenta": color.MagentaString,
"colorCyan": color.CyanString,
"colorWhite": color.WhiteString,
"levelColor": func(level string) string {
"levelColor": func(value any) string {
switch level := value.(type) {
case string:
var levelColor *color.Color
switch strings.ToLower(level) {
case "debug":
levelColor = color.New(color.FgMagenta)
case "info":
levelColor = color.New(color.FgBlue)
case "warn":
levelColor = color.New(color.FgYellow)
case "warning":
levelColor = color.New(color.FgYellow)
case "error":
levelColor = color.New(color.FgRed)
case "dpanic":
levelColor = color.New(color.FgRed)
case "panic":
levelColor = color.New(color.FgRed)
case "fatal":
levelColor = color.New(color.FgCyan)
case "critical":
levelColor = color.New(color.FgCyan)
default:
return level
}
return levelColor.SprintFunc()(level)
default:
return ""
}
},
"bunyanLevelColor": func(value any) string {
var lv int64
var err error

switch level := value.(type) {
// tryParseJSON yields json.Number
case json.Number:
lv, err = level.Int64()
if err != nil {
return ""
}
// parseJSON yields float64
case float64:
lv = int64(level)
default:
return ""
}

var levelColor *color.Color
switch strings.ToLower(level) {
case "debug":
switch {
case lv < 30:
levelColor = color.New(color.FgMagenta)
case "info":
case lv < 40:
levelColor = color.New(color.FgBlue)
case "warn":
levelColor = color.New(color.FgYellow)
case "warning":
case lv < 50:
levelColor = color.New(color.FgYellow)
case "error":
case lv < 60:
levelColor = color.New(color.FgRed)
case "dpanic":
levelColor = color.New(color.FgRed)
case "panic":
levelColor = color.New(color.FgRed)
case "fatal":
levelColor = color.New(color.FgCyan)
case "critical":
case lv < 100:
levelColor = color.New(color.FgCyan)
default:
return level
return strconv.FormatInt(lv, 10)
}
return levelColor.SprintFunc()(level)
return levelColor.SprintFunc()(lv)
},
}
template, err := template.New("log").Funcs(funs).Parse(t)
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