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Add zero-indexed lint.

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Phil Hagelberg 2025-08-01 10:10:15 -07:00 committed by XeroOl
parent a366e5996d
commit de784e91ad
1 changed files with 17 additions and 0 deletions
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src/fennel-ls/lint.fnl
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@ -770,6 +770,23 @@ You can read more about how to add lints in docs/linting.md"
(each [k (pairs seen)] (each [k (pairs seen)]
(set (. seen k) nil))))))))}) (set (. seen k) nil))))))))})
(fn zero-indexed [server file [callee tbl key &as ast]]
(if (and (sym? callee ".") (= 0 key) (not (sym? tbl :arg)))
{:range (message.ast->range server file ast)
:message "indexing a table with 0; did you forget that Lua is 1-indexed?"
:severity message.severity.WARN}))
(add-lint :zero-indexed
{:what-it-does "Checks for accidentally treating tables as zero-indexed."
:why-care? "For new Fennel learners, this is a common mistake."
:example
"```fnl
(print (. inputs 0))
```"
:since "0.2.2-dev"
:type :special-call
:impl zero-indexed})
(add-lint :invalid-flsproject-settings (add-lint :invalid-flsproject-settings
{:what-it-does {:what-it-does
"Checks if the flsproject file's settings are valid." "Checks if the flsproject file's settings are valid."