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config: add [colors].dim0-7

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This allows you to configure custom colors to be used when colors are
being dimmed (`\E[2m`).

It is implemented by color matching (just like
bold-text-in-bright=palette-based); the color-to-be-dimmed is matched
against the current color palette.

If it matches one of the regular colors (colors 0-7), the
corresponding “dim” color will be used.

If it matches one of the bright colors (colors 8-15), the
corresponding “regular” color will be used (but *only* if the “dim”
color has been set).

Otherwise, the color is dimmed by reducing its luminance.

The default behavior, i.e. when dim0-7 hasn’t been configured, is to
dim by reducing luminance for *all* colors. I.e. we don’t do any color
matching at all. In particular, this means that dimming a bright color
will *not* result in the corresponding “regular” color.

Closes #776
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Daniel Eklöf 2021-11-03 14:25:38 +01:00
parent 0d2a429109
commit c01904a2c7
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30
doc/foot.ini.5.scd
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@ -499,6 +499,36 @@ can configure the background transparency with the _alpha_ option.
_bfebbf_, _f0dfaf_, _8cd0d3_, _fcace3_, _b3ffff_ and _ffffff_ (a
variant of the _zenburn_ theme).
*dim0*, *dim1* *..* *dim7*
Custom colors to use with dimmed colors. Dimmed colors do not have
an entry in the color palette. Applications emit them by combining
a color value, and a "dim" attribute.
By default, foot implements this by reducing the luminance of the
current color. This is a generic approach that applies to both
colors from the 256-color palette, as well as 24-bit RGB colors.
You can change this behavior by setting the *dimN* options. When
set, foot will match the current color against the color palette,
and if it matches one of the *regularN* colors, the corresponding
*dimN* color will be used.
If instead the current color matches one of the *brightN* colors,
the corresponding *regularn* color will be used.
If the current color does not match any known colors, it is dimmed
by reducing the luminance (i.e. the same behavior as if the *dimN*
options are unconfigured). 24-bit RGB colors will typically fall
into this category.
Note that applications can change the *regularN* and *brighN*
colors at runtime. However, they have no way of changing the
*dimN* colors. If an application has changed the *regularN*
colors, foot will still use the corresponding *dimN* color, as
configured in foot.ini.
Default: _not set_.
*0* *..* *255*
Arbitrary colors in the 256-color palette. Default: for *0* *..*
*15*, see regular and bright defaults above; see