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- #elvdoc:fn styled-segment
- #
- # ```elvish
- # styled-segment $object &fg-color=default &bg-color=default &bold=$false &dim=$false &italic=$false &underlined=$false &blink=$false &inverse=$false
- # ```
- #
- # Constructs a styled segment, a building block for styled texts.
- #
- # - If `$object` is a string, constructs a styled segment with `$object` as the
- # content, and the properties specified by the options.
- #
- # - If `$object` is a styled segment, constructs a styled segment that is a
- # copy of `$object`, with the properties specified by the options overridden.
- #
- # The properties of styled segments can be inspected by indexing into it. Valid
- # keys are the same as the options to `styled-segment`, plus `text` for the
- # string content:
- #
- # ```elvish-transcript
- # ~> var s = (styled-segment abc &bold)
- # ~> put $s[text]
- # ▶ abc
- # ~> put $s[fg-color]
- # ▶ default
- # ~> put $s[bold]
- # ▶ $true
- # ```
- #
- # Prefer the high-level [`styled`](#styled) command to build and transform
- # styled texts. Styled segments are a low-level construct, and you only have to
- # deal with it when building custom style transformers.
- #
- # In the following example, a custom transformer sets the `inverse` property
- # for every bold segment:
- #
- # ```elvish
- # styled foo(styled bar bold) {|x| styled-segment $x &inverse=$x[bold] }
- # # transforms "foo" + bold "bar" into "foo" + bold and inverse "bar"
- # ```
- #elvdoc:fn styled
- #
- # ```elvish
- # styled $object $style-transformer...
- # ```
- #
- # Constructs a **styled text** by applying the supplied transformers to the
- # supplied `$object`, which may be a string, a [styled
- # segment](#styled-segment), or an existing styled text.
- #
- # Each `$style-transformer` can be one of the following:
- #
- # - A boolean attribute name:
- #
- # - One of `bold`, `dim`, `italic`, `underlined`, `blink` and `inverse` for
- # setting the corresponding attribute.
- #
- # - An attribute name prefixed by `no-` for unsetting the attribute.
- #
- # - An attribute name prefixed by `toggle-` for toggling the attribute
- # between set and unset.
- #
- # - A color name for setting the text color, which may be one of the
- # following:
- #
- # - One of the 8 basic ANSI colors: `black`, `red`, `green`, `yellow`,
- # `blue`, `magenta`, `cyan` and `white`.
- #
- # - The bright variant of the 8 basic ANSI colors, with a `bright-` prefix.
- #
- # - Any color from the xterm 256-color palette, as `colorX` (such as
- # `color12`).
- #
- # - A 24-bit RGB color written as `#RRGGBB` (such as `'#778899'`).
- #
- # **Note**: You need to quote such values, since an unquoted `#` introduces
- # a comment (e.g. use `'bg-#778899'` instead of `bg-#778899`).
- #
- # - A color name prefixed by `fg-` to set the foreground color. This has
- # the same effect as specifying the color name without the `fg-` prefix.
- #
- # - A color name prefixed by `bg-` to set the background color.
- #
- # - A function that receives a styled segment as the only argument and outputs
- # a single styled segment, which will be applied to all the segments.
- #
- # When a styled text is converted to a string the corresponding
- # [ANSI SGR code](https://en.wikipedia.org/wiki/ANSI_escape_code#SGR_.28Select_Graphic_Rendition.29_parameters)
- # is built to render the style.
- #
- # Examples:
- #
- # ```elvish
- # echo (styled foo red bold) # prints red bold "foo"
- # echo (styled (styled foo red bold) green) # prints green bold "foo"
- # ```
- #
- # A styled text can contain multiple [segments](#styled-segment) with different
- # styles. Such styled texts can be constructed by concatenating multiple styled
- # texts with the [compounding](language.html#compounding) syntax. Strings and
- # styled segments are automatically "promoted" to styled texts when
- # concatenating. Examples:
- #
- # ```elvish
- # echo foo(styled bar red) # prints "foo" + red "bar"
- # echo (styled foo bold)(styled bar red) # prints bold "foo" + red "bar"
- # ```
- #
- # The individual segments in a styled text can be extracted by indexing:
- #
- # ```elvish
- # var s = (styled abc red)(styled def green)
- # put $s[0] $s[1]
- # ```
- #
- # When printed to the terminal, a styled text is not affected by any existing
- # SGR styles in effect, and it will always reset the SGR style afterwards. For
- # example:
- #
- # ```elvish
- # print "\e[1m"
- # echo (styled foo red)
- # echo bar
- # # "foo" will be printed as red, but not bold
- # # "bar" will be printed without any style
- # ```
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