lush/issues/02-backtick-lexing-parsing.md

02 — Complete backtick command lexing and parsing

Status: done Blocked by: #01 Blocks: #03

Backtick lexing is partially implemented:

• llex.c: TK_COMMAND token lexed via read_string() on backtick
• llex.h: TK_COMMAND enum added
• lparser.c: TK_COMMAND handled in simpleexp() (as string) and suffixedexp() (as func args)

Remaining work

• Verify the lexer handles edge cases (escaped backticks, newlines, nested quotes)
• Parser must emit code that produces a result table ({code, stdout, stderr}) at runtime, not just a string literal
• May need a new opcode (e.g. OP_COMMAND) or compile as a call to a built-in execution function
• Add string interpolation inside backticks if decided in #01

Files touched

• llex.c / llex.h
• lparser.c
• Possibly lopcodes.h / lopcodes.c if adding a new opcode