lualine.nvim/CONTRIBUTING.md

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# Contributing to lualine.nvim
### General
* 2 spaces
* snake_case
### All contributions are very welcome but themes/ extensions require a lot of work on my part if not done properly so here's a guide on how to do them.
### Adding a theme
* refer to example below to see how themes are defined
* take 4 screenshots showing a different vim modes (normal, insert, visual, replace)
* add your theme with screenshots attached to [THEMES.md](./THEMES.md) while maintaining alphabetical order
<details>
<summary><b>theme example</b></summary>
To create a custom theme you need to define a colorscheme for each of vim's modes. Each mode has a `fg` and `bg` field for every lualine section.
You can add special effects with `gui`.
You can provide colors in two ways
1. As a table like `{'hexcode', 256_color_code}`
2. As a String like `'hexcode'`
Note : You can use `lualine.util.get_cterm_color(hex_color)` function to genarate 256_color_codes from hex_codes.
When method 2 is used 256_color_codes are genarated with that .
Adding theme is really easy in lua. Here is and example of a gruvbox theme.
```lua
local gruvbox = { }
local colors = {
-- color format { hex_color, 256_color_code}
black = {"#282828", 235},
white = {'#ebdbb2', 223},
red = {'#fb4934', 203},
green = {'#b8bb26', 143},
blue = {'#83a598', 108},
yellow = {'#fe8019', 209},
-- color format 'hex_color'
gray = '#a89984',
darkgray = '#3c3836',
lightgray = '#504945',
inactivegray = '#7c6f64',
}
gruvbox.normal = {
-- gui parameter is optional and behaves the same way as in vim's highlight command
a = { bg = colors.gray, fg = colors.black, gui = "bold", },
b = { bg = colors.lightgray, fg = colors.white, },
c = { bg = colors.darkgray, fg = colors.gray }
}
gruvbox.insert = {
a = { bg = colors.blue, fg = colors.black, gui = "bold", },
b = { bg = colors.lightgray, fg = colors.white, },
c = { bg = colors.lightgray, fg = colors.white }
}
gruvbox.visual = {
a = { bg = colors.yellow, fg = colors.black, gui = "bold", },
b = { bg = colors.lightgray, fg = colors.white, },
c = { bg = colors.inactivegray, fg = colors.black },
}
gruvbox.replace = {
a = { bg = colors.red, fg = colors.black, gui = "bold", },
b = { bg = colors.lightgray, fg = colors.white, },
c = { bg = colors.black, fg = colors.white },
}
gruvbox.command = {
a = { bg = colors.green, fg = colors.black, gui = "bold", },
b = { bg = colors.lightgray, fg = colors.white, },
c = { bg = colors.inactivegray, fg = colors.black },
}
-- you can assign one colorscheme to another, if a colorscheme is
-- undefined it falls back to normal
gruvbox.terminal = gruvbox.normal
gruvbox.inactive = {
a = { bg = colors.darkgray, fg = colors.gray, gui = "bold", },
b = { bg = colors.darkgray, fg = colors.gray, },
c = { bg = colors.darkgray, fg = colors.gray },
}
lualine.theme = gruvbox
```
</details>
### Adding an extension
* add your extension with screenshots attached to [EXTENSIONS.md](./EXTENSIONS.md) while maintaining alphabetical order