Helix

• FAQ, keymap, repo. Keyboard prefixes: A- Alt+, C- Control+.
• Show whitespace: :set whitespace.render all
• Tutorial is available as hx --tutor or :tutor.
• Open an arbitrary file: :o
• Modes:
  • C-w window (C-w next window)
  • ] right bracket goto next (]d diagnostic; ]f function)
  • g goto (gd definition; gs first non-blank in line; gn next buffer)
  • i insert (C-c close popup; C-k delete to end of line)
  • m match (mim select inside matching pair; mi" select inside double quotes; ms" surround selection with double quotes); maf select function definition; mat select type (class) definition.
  • space (k documentation; f file picker (C-n next; C-p previous; C-v open vertical; C-s open horizontal))
  • v visual select
  • z view (zt align to window top)
• [n]x select lines; Undo by switching to visual select and moving.
• Tree-sitter: A-p (previous), A-o (extend), A-i (reduce) and A-n (next) allow you to move the selection according to its location in the syntax tree.
• A insert at end of line; I insert at first non-whitespace in line.
• A-; Goto other end of selection
• Deduplicate: %; :pipe sort; :pipe uniq (wrap selected text: :pipe fmt -w 80)
• Create cursor on next line: C
• Make selection the search string: *
• Collapse selection onto a single cursor ;
• Swap case: ~; Lowercase: `
• w start of next word; e end of current word; b beginning of current word (WEB for WORD movement)
• Jumplist/history: C-i in/forwards; C-o out/backwards; C-s add
• C-c toggle comment
• Q toggle recording; q play recording
• Replace all:
  1. % select all
  2. s select matches, followed by old string/regex and <CR>
  3. c replace all with cursors, followed by new string
  4. <ESC>, deactivate and deselect cursors
  5. , collapse multiple cursors down to one.
• :insert-output to run shell command and insert its output.

Configuration

In ~/.config/helix/:

config.toml

theme = "ahernp"

[editor]
line-number = "relative"
mouse = false
bufferline = "always"
color-modes = true

[editor.cursor-shape]
insert = "bar"

[editor.soft-wrap]
enable = true

[editor.statusline]
left = ["mode", "spinner", "version-control", "file-name", "file-modification-indicator"]

languages.toml

[[language]]
name = "python"
roots = [".git"]
auto-format = true
formatter = {command = 'black', args = ["--quiet", "-"]}

[language-server.pylsp]
config = {pylsp={plugins={pycodestyle={enabled=false},flake8={enabled=true,maxLineLength=120},pyflakes={enabled=false}}}}

[[language]]
name = "html"
auto-format = false
indent = { tab-width = 4, unit = "  " }

[[language]]
name = "css"
auto-format = false
indent = { tab-width = 4, unit = "  " }

[[language]]
name = "javascript"
auto-format = true

themes/ahernp.toml

inherits = "penumbra+"

"ui.statusline.insert" = { fg = "white", bg = "#FF0000" } 

Language servers

Check: hx --health [python|javascript|html|css]

• Python (pylsp): pip install python-lsp-server flake8
• Javascript: sudo npm install -g typescript typescript-language-server
• CSS, HTML and JSON: sudo npm i -g vscode-langservers-extracted