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Themes

First you'll need to place selected themes in your themes directory (i.e ~/.config/helix/themes), the directory might have to be created beforehand.

To use a custom theme add theme = <name> to your config.toml or override it during runtime using :theme <name>.

The default theme.toml can be found here, and user submitted themes here.

Creating a theme

First create a file with the name of your theme as file name (i.e mytheme.toml) and place it in your themes directory (i.e ~/.config/helix/themes).

Each line in the theme file is specified as below:

key = { fg = "#ffffff", bg = "#000000", modifiers = ["bold", "italic"] }

where key represents what you want to style, fg specifies the foreground color, bg the background color, and modifiers is a list of style modifiers. bg and modifiers can be omitted to defer to the defaults.

To specify only the foreground color:

key = "#ffffff"

if the key contains a dot '.', it must be quoted to prevent it being parsed as a dotted key.

"key.key" = "#ffffff"

Color palettes

It's recommended define a palette of named colors, and refer to them from the configuration values in your theme. To do this, add a table called palette to your theme file:

ui.background = "white"
ui.text = "black"

[palette]
white = "#ffffff"
black = "#000000"

Remember that the [palette] table includes all keys after its header, so you should define the palette after normal theme options.

The default palette uses the terminal's default 16 colors, and the colors names are listed below. The [palette] section in the config file takes precedence over it and is merged into the default palette.

Color Name
`black`
`red`
`green`
`yellow`
`blue`
`magenta`
`cyan`
`gray`
`light-red`
`light-green`
`light-yellow`
`light-blue`
`light-magenta`
`light-cyan`
`light-gray`
`white`

Modifiers

The following values may be used as modifiers.

Less common modifiers might not be supported by your terminal emulator.

Modifier
`bold`
`dim`
`italic`
`underlined`
`slow_blink`
`rapid_blink`
`reversed`
`hidden`
`crossed_out`

Scopes

The following is a list of scopes available to use for styling.

Syntax highlighting

These keys match tree-sitter scopes.

For a given highlight produced, styling will be determined based on the longest matching theme key. For example, the highlight function.builtin.static would match the key function.builtin rather than function.

We use a similar set of scopes as SublimeText. See also TextMate scopes.

type - Types
- builtin - Primitive types provided by the language (int, usize)
constant (TODO: constant.other.placeholder for %v)
- builtin Special constants provided by the language (true, false, nil etc)
  - boolean
- character
  - escape
- numeric (numbers)
  - integer
  - float
string (TODO: string.quoted.{single, double}, string.raw/.unquoted)?
- regexp - Regular expressions
- special
  - path
  - url
  - symbol - Erlang/Elixir atoms, Ruby symbols, Clojure keywords
comment - Code comments
- line - Single line comments (//)
- block - Block comments (e.g. (/* */)
  - documentation - Documentation comments (e.g. /// in Rust)
variable - Variables
- builtin - Reserved language variables (self, this, super, etc)
- parameter - Function parameters
- other
  - member - Fields of composite data types (e.g. structs, unions)
- function (TODO: ?)
label
punctuation
- delimiter - Commas, colons
- bracket - Parentheses, angle brackets, etc.
keyword
- control
  - conditional - if, else
  - repeat - for, while, loop
  - import - import, export
  - return
- operator - or, in
- directive - Preprocessor directives (#if in C)
- function - fn, func
operator - ||, +=, >
function
- builtin
- method
- macro
- special (preprocesor in C)
tag - Tags (e.g. <body> in HTML)
namespace

Interface

These scopes are used for theming the editor interface.

Key	Notes
`ui.background`
`ui.cursor`
`ui.cursor.insert`
`ui.cursor.select`
`ui.cursor.match`	Matching bracket etc.
`ui.cursor.primary`	Cursor with primary selection
`ui.linenr`
`ui.linenr.selected`
`ui.statusline`	Statusline
`ui.statusline.inactive`	Statusline (unfocused document)
`ui.popup`
`ui.window`
`ui.help`
`ui.text`
`ui.text.focus`
`ui.info`
`ui.info.text`
`ui.menu`
`ui.menu.selected`
`ui.selection`	For selections in the editing area
`ui.selection.primary`
`warning`	Diagnostics warning (gutter)
`error`	Diagnostics error (gutter)
`info`	Diagnostics info (gutter)
`hint`	Diagnostics hint (gutter)
`diagnostic`	For text in editing area

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