e - a text editor

e will be a text editor written in C. It'll follow a transparent client-server to allow concurrent editing of the same file(s). tree-sitter will be used for syntax highlighting and basic code analysis.

e isn't ready for use (or even testing) yet.

ToDo

• rope data structure
• range/cursor handling
• command framework (do/undo)
• socket protocol (json/bjson?)
• daemon lifecycle
• tree-sitter integration
• command line frontend
• vt100 frontend

Concepts

• e-editor
  • 0-n documents representing opened files
    • 0-n documents editors
      • undo/redo stack
      • 0-n cursors
        • cursor position
        • edit actions

protocol

newline delimited json protocol with optional trailing payload or inline payload

Inline Payload

{ "action": "insert", "payload": "Hello World!" }

Trailing Payload

A trailing payload is indicated by the payload field being a number.

{ "action": "insert", "payload": 12 }
Hello World!

Alternative command mode

For convenience there is an alternative syntax for commands, that is easier to type in a terminal. This mode is never sent by e but can be used to make interaction with the daemon easier.

command arg1 arg2 arg3

The above is equivalent to:

{ "action": "command", "payload": ["arg1", "arg2", "arg3"], "payload_str": "arg1 arg2 arg3" }

you can also embed json in the payload:

command arg1 arg2 {"foo": "bar"}

is equivalent to:

{ "action": "command", "payload": ["arg1", "arg2", {"foo": "bar"}], "payload_str": "arg1 arg2 {\"foo\": \"bar\"}" }