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helix-plus/book/src/themes.md

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Themes

To use a theme add theme = "<name>" to your config.toml at the very top of the file before the first section or select it during runtime using :theme <name>.

Creating a theme

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). The directory might have to be created beforehand.

The names "default" and "base16_default" are reserved for the builtin themes and cannot be overridden by user defined themes.

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

Each line in the theme file is specified as below:

key = { fg = "#ffffff", bg = "#000000", underline = { color = "#ff0000", style = "curl"}, modifiers = ["bold", "italic"] }

where key represents what you want to style, fg specifies the foreground color, bg the background color, underline the underline style/color, and modifiers is a list of style modifiers. bg, underline 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

Note: The underlined modifier is deprecated and only available for backwards compatibility. Its behavior is equivalent to setting underline.style="line".

Underline Style

One of the following values may be used as a value for underline.style.

Some styles might not be supported by your terminal emulator.

Modifier
line
curl
dashed
dot
double_line

Inheritance

Extend upon other themes by setting the inherits property to an existing theme.

inherits = "boo_berry"

# Override the theming for "keyword"s:
"keyword" = { fg = "gold" }

# Override colors in the palette:
[palette]
berry = "#2A2A4D"

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.

  • attribute - Class attributes, html tag attributes

  • type - Types

    • builtin - Primitive types provided by the language (int, usize)
  • constructor

  • 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)
  • label

  • punctuation

    • delimiter - Commas, colons
    • bracket - Parentheses, angle brackets, etc.
    • special - String interpolation brackets.
  • keyword

    • control
      • conditional - if, else
      • repeat - for, while, loop
      • import - import, export
      • return
      • exception
    • operator - or, in
    • directive - Preprocessor directives (#if in C)
    • function - fn, func
    • storage - Keywords describing how things are stored
      • type - The type of something, class, function, var, let, etc.
      • modifier - Storage modifiers like static, mut, const, ref, etc.
  • operator - ||, +=, >

  • function

    • builtin
    • method
    • macro
    • special (preprocessor in C)
  • tag - Tags (e.g. <body> in HTML)

  • namespace

  • markup

    • heading
      • marker
      • 1, 2, 3, 4, 5, 6 - heading text for h1 through h6
    • list
      • unnumbered
      • numbered
    • bold
    • italic
    • link
      • url - urls pointed to by links
      • label - non-url link references
      • text - url and image descriptions in links
    • quote
    • raw
      • inline
      • block
  • diff - version control changes

    • plus - additions
    • minus - deletions
    • delta - modifications
      • moved - renamed or moved files/changes

Interface

These scopes are used for theming the editor interface.

  • markup
    • normal
      • completion - for completion doc popup ui
      • hover - for hover popup ui
    • heading
      • completion - for completion doc popup ui
      • hover - for hover popup ui
    • raw
      • inline
        • completion - for completion doc popup ui
        • hover - for hover popup ui
Key Notes
ui.background
ui.background.separator Picker separator below input line
ui.cursor
ui.cursor.insert
ui.cursor.select
ui.cursor.match Matching bracket etc.
ui.cursor.primary Cursor with primary selection
ui.gutter Gutter
ui.gutter.selected Gutter for the line the cursor is on
ui.linenr Line numbers
ui.linenr.selected Line number for the line the cursor is on
ui.statusline Statusline
ui.statusline.inactive Statusline (unfocused document)
ui.statusline.normal Statusline mode during normal mode (only if editor.color-modes is enabled)
ui.statusline.insert Statusline mode during insert mode (only if editor.color-modes is enabled)
ui.statusline.select Statusline mode during select mode (only if editor.color-modes is enabled)
ui.statusline.separator Separator character in statusline
ui.popup Documentation popups (e.g Space + k)
ui.popup.info Prompt for multiple key options
ui.window Border lines separating splits
ui.help Description box for commands
ui.text Command prompts, popup text, etc.
ui.text.focus
ui.text.info The key: command text in ui.popup.info boxes
ui.virtual.ruler Ruler columns (see the editor.rulers config)
ui.virtual.whitespace Visible whitespace characters
ui.virtual.indent-guide Vertical indent width guides
ui.menu Code and command completion menus
ui.menu.selected Selected autocomplete item
ui.menu.scroll fg sets thumb color, bg sets track color of scrollbar
ui.selection For selections in the editing area
ui.selection.primary
ui.cursorline.primary The line of the primary cursor (if cursorline is enabled)
ui.cursorline.secondary The lines of any other cursors (if cursorline is enabled)
ui.cursorcolumn.primary The column of the primary cursor (if cursorcolumn is enabled)
ui.cursorcolumn.secondary The columns of any other cursors (if cursorcolumn is enabled)
warning Diagnostics warning (gutter)
error Diagnostics error (gutter)
info Diagnostics info (gutter)
hint Diagnostics hint (gutter)
diagnostic Diagnostics fallback style (editing area)
diagnostic.hint Diagnostics hint (editing area)
diagnostic.info Diagnostics info (editing area)
diagnostic.warning Diagnostics warning (editing area)
diagnostic.error Diagnostics error (editing area)

You can check compliance to spec with

cargo xtask themelint onedark  # replace onedark with <name>