Writing a shell in Go

What It Covers

Chi Shao explains building Elvish shell in Go over eleven years, covering language design decisions, cross-platform compatibility, built-in programming features, and Go's advantages for systems programming.

Key Questions Answered

• •Language Selection: Go provided modern syntax, complete system call bindings, and garbage collection in 2013 when alternatives were C/C++, Java, or Python - eliminating need for custom memory management.
• •Standard Library Leverage: Half of Elvish's modules directly wrap Go's standard library using reflection - strings, regex, HTTP, math, and OS packages become shell commands with minimal code.
• •Cross-Platform Strategy: Go's os/exec package handles program launching portably across Unix and Windows, requiring platform-specific code only for keyboard input parsing and system-dependent metadata fields.
• •Programming Language Features: Elvish implements nested lists, maps, lambdas, and functional programming paradigms that traditional shells lack - anything representable in JSON works in Elvish scripting.
• •Built-in UI Components: Control-N launches file manager with three-pane view, Control-R shows filterable command history list instead of single-match search - enhancing interactive shell experience significantly.