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Nanaloveyuki
109 lines
3.8 KiB
Markdown
109 lines
3.8 KiB
Markdown
---
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name: text-formatter
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group: api
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category: formatter
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update-time: 20260512
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description: Create a configurable text formatter for console, callback, and file-oriented text logging output.
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key-word:
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- formatter
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- text
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- color
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- public
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---
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## Text-formatter
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Create a `TextFormatter` that controls timestamp, level, target, field rendering, template substitution, color behavior, and style markup behavior. This is the main API for readable text output in `BitLogger`.
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### Interface
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```moonbit
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pub fn text_formatter(
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show_timestamp~ : Bool = true,
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show_level~ : Bool = true,
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show_target~ : Bool = true,
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show_fields~ : Bool = true,
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separator~ : String = " ",
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field_separator~ : String = " ",
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template~ : String = "",
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color_mode~ : ColorMode = ColorMode::Never,
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color_support~ : ColorSupport = ColorSupport::TrueColor,
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style_markup~ : StyleMarkupMode = StyleMarkupMode::Full,
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target_style_markup~ : StyleMarkupMode = StyleMarkupMode::Disabled,
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fields_style_markup~ : StyleMarkupMode = StyleMarkupMode::Disabled,
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style_tags~ : StyleTagRegistry? = None,
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) -> TextFormatter {}
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```
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#### input
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- `show_timestamp : Bool` - Whether timestamp text is rendered when the record carries a timestamp.
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- `show_level : Bool` - Whether the level label is rendered.
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- `show_target : Bool` - Whether the target is rendered.
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- `show_fields : Bool` - Whether structured fields are rendered.
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- `separator : String` - Separator between major rendered parts.
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- `field_separator : String` - Separator used between field values in text output.
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- `template : String` - Optional template using tokens such as `{level}`, `{target}`, `{message}`, `{timestamp}`, `{timestamp_ms}`, and `{fields}`.
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- `color_mode : ColorMode` - `Never`, `Auto`, or `Always`.
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- `color_support : ColorSupport` - `Basic` or `TrueColor`.
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- `style_markup : StyleMarkupMode` - Controls whether message style tags are parsed.
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- `target_style_markup : StyleMarkupMode` - Controls whether target style tags are parsed.
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- `fields_style_markup : StyleMarkupMode` - Controls whether field-value style tags are parsed.
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- `style_tags : StyleTagRegistry?` - Optional local tag registry.
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#### output
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- `TextFormatter` - A reusable text formatter instance for text sinks or direct formatting.
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### Explanation
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Detailed rules explaining key parameters and behaviors
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- If `template` is empty, the formatter uses built-in part assembly.
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- `color_mode=Auto` currently follows a conservative rule based on `NO_COLOR`.
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- `style_markup`, `target_style_markup`, and `fields_style_markup` are independent scopes.
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- Local `style_tags` override global tag registry lookup, which overrides builtin tags.
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### How to Use
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Here are some specific examples provided.
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#### When Need Human-readable Console Output
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When logs should stay readable in terminals:
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```moonbit
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let formatter = text_formatter(
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show_timestamp=false,
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template="[{level}] {target} {message} :: {fields}",
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)
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let logger = Logger::new(text_console_sink(formatter), target="demo")
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```
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In this example, the formatter produces predictable text output without timestamps.
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And the same formatter can be reused by multiple sinks.
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#### When Need Styled ANSI Output
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When you want visible severity or semantic tags in terminal output:
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```moonbit
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let formatter = text_formatter(color_mode=ColorMode::Always)
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.with_style_tags(default_style_tag_registry().set_tag("accent", fg=Some("#4cc9f0"), bold=true))
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```
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In this example, message text can use inline tags such as `<accent>...</>`.
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### Error Case
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e.g.:
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- If `template` contains unknown text, the formatter keeps it as plain text.
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- If a style tag is unknown or invalid, current behavior falls back to plain text rather than raising an error.
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### Notes
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1. Prefer `text_formatter(...)` when you want explicit control over readable text output.
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2. `TextFormatter` is reusable and should usually be constructed once, then shared.
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