9e75175c79
#16 multiline shell commands #17 _ scope (global vs local) #18 path expansion (~) #19 nested commands trigger prompt2 #20 simplify backtick return value #21 prompt redesign #22 implicit interactive commands (drop ! prefix) #23 general cleanup and refactor
16 lines
625 B
Markdown
16 lines
625 B
Markdown
# 17 — `_` is global rather than local
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**Status:** open
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The `_` result variable from interactive commands (`!cmd`) is set as a global via `lua_setglobal(L, "_")`. This has several implications:
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- It can escape its scope and pollute other scopes
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- A function may silently overwrite `_` if it uses shell commands internally, surprising the caller
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- Lua convention uses `_` as a throwaway variable in `for` loops (`for _, v in pairs(t)`)
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## Investigation needed
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- What are the concrete consequences of `_` being global vs local?
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- Can we make it local to the REPL line instead?
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- Should we use a different name entirely?
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