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# Helix
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| Crate | Description |
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| helix-core | Core editing primitives, functional. |
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| helix-syntax | Tree-sitter grammars |
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| helix-view | UI abstractions for use in backends, imperative shell. |
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| helix-term | Terminal UI |
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- server-client architecture via gRPC, UI separate from core
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- multi cursor based editing and slicing
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- WASM based plugins (builtin LSP & fuzzy file finder)
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- piece table-based tree structure for changes
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Structure similar to codemirror:
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text (ropes)
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- column utils, stuff like tab aware (row, col) -> char pos translation
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- word/grapheme/code point utils and iterators
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state
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- transactions
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- changes
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- annotations (time changed etc)
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- state effects
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- additional editor state as facets
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- snapshots as an async view into current state
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- selections { anchor (nonmoving), head (moving) from/to } -> SelectionSet with a primary
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- cursor is just a single range selection
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- markers
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track a position inside text that synchronizes with edits
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{ doc, selection, update(), splice, changes(), facets, tabSize, identUnit, lineSeparator, changeFilter/transactionFilter to modify stuff before }
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view (actual UI)
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- renders via termwiz
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- viewport(Lines) -> what's actually visible
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- extend the view via Decorations (inline styling) or Components (UI)
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- mark / wieget / line / replace decoration
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commands (transform state)
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- movement
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- selection extension
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- deletion
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- indentation
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keymap (maps keys to commands)
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history (undo tree via immutable ropes)
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- undoes transactions
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- invert changes (generates a revert)
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(collab mode)
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gutter (line numbers, diagnostic marker, etc) -> ties into UI components
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rangeset/span -> mappable over changes (can be a marker primitive?)
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syntax (treesitter)
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- indentation strategies
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fold
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selections (select mode/multiselect)
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matchbrackets
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closebrackets
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special-chars (shows dots etc for specials)
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panel (for UI: file pickers, search dialogs, etc)
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tooltip (for UI)
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search (regex? pcre)
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lint (async linters)
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lsp
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highlight (?)
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stream-syntax
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autocomplete
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comment (gc, etc for auto commenting)
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snippets
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terminal mode?
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plugins can contain more commands/ui abstractions to use elsewhere
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languageData as presets for each language (syntax, indent, comment, etc)
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TODO: determine rust vs script portions
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vim stuff:
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motions/operators/text objects
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full visual mode
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macros
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jump lists
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marks
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yank/paste
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conceal for markdown markers, etc
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---
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codemirror uses offsets exclusively with Line being computed when necessary
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(with start/end extents)
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lines are temporarily cached in a lineCache
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