todo: `gears.color` module not completed

lua/gears/color/init.lua

@@ -0,0 +1,46 @@
+--- ### Description
+--- This module simplifies the creation of cairo pattern objects.
+---
+--- In most places in awesome where a color is needed, the provided argument is passed to [`gears.color`](https://awesomewm.org/apidoc/theme_related_libraries/gears.color.html#),
+--- which actually calls [`create_pattern`](https://awesomewm.org/apidoc/theme_related_libraries/gears.color.html#create_pattern) and creates a pattern from a given string or table.
+---
+--- This function can create solid, linear, radial and png patterns.
+---
+--- A simple example for a solid pattern is a hexadecimal color specification. For example `#ff8000` creates a solid pattern with 100% red, 50% green and 0% blue.
+--- Limited support for named colors (red) is also provided.
+---
+--- In general, patterns are specified as strings formatted as "type:arguments". "arguments" is specific to the pattern being used.
+--- For example, one can use:
+--- ```
+--- 'radial:50,50,10:55,55,30:0,#ff0000:0.5,#00ff00:1,#0000ff'
+--- ```
+--- The above will call [`create_radial_pattern`](https://awesomewm.org/apidoc/theme_related_libraries/gears.color.html#create_radial_pattern)
+--- with the provided string, after stripping the `radial:` prefix.
+---
+--- Alternatively, patterns can be specified via tables. In this case, the table's `type` member specifies the type.
+--- For example:
+--- ```
+--- {
+---   type = 'radial',
+---   from = { 50, 50, 10 },
+---   to = { 55, 55, 30 },
+---   stops = { { 0, '#ff0000' }, { 0.5, '#00ff00' }, { 1, '#0000ff' } },
+--- }
+--- ```
+--- Any argument that cannot be understood is passed to [`create_solid_pattern`](https://awesomewm.org/apidoc/theme_related_libraries/gears.color.html#create_solid_pattern).
+---
+---  Please note that you **MUST NOT** modify the returned pattern, for example by calling `:set_matrix()` on it,
+--- because this function uses a cache and your changes could thus have unintended side effects.
+--- Use [`create_pattern_uncached`](https://awesomewm.org/apidoc/theme_related_libraries/gears.color.html#create_pattern_uncached)
+--- if you need to modify the returned pattern.
+---
+--- ### Information
+--- - **Copyright**: 2010 Uli Schlachter
+--- - **Originally authored by**: Uli Schlachter
+---
+--- [See all contributors on GitHub](https://github.com/awesomeWM/awesome/graphs/contributors)
+---
+--- [View documents](https://awesomewm.org/apidoc/utility_libraries/gears.color.html)
+local GColour = {}
+
+return GColour