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feat(fennel): add fennel support #498

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1 change: 1 addition & 0 deletions README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -149,6 +149,7 @@ In addition, you will need to have either Treesitter or a working LSP client. Yo
- editorconfig
- elixir
- enforce
- fennel
- fish
- go
- groovy
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19 changes: 19 additions & 0 deletions lua/aerial/backends/treesitter/extensions.lua
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Expand Up @@ -404,6 +404,25 @@ M.zig = {
end,
}

M.fennel = {
postprocess = function(bufnr, item, match)
local node = node_from_match(match, "symbol")
local full_form = get_node_text(node, bufnr)

if item.kind == "Function" then
local name = string.match(full_form, "[λ fn lambda macro] (%S+) %[")
item.name = name ~= nil and name or "<Anonymous>"
elseif item.kind == "Class" or item.kind == "Struct" then
local kind = (item.kind == "Class") and "local" or "var"
local query = kind .. " (%S+)"
local name = string.match(full_form, query) or "<parse error>"
item.name = name
else
item.name = "<parse error>"
end
end,
Comment on lines +407 to +423
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@stevearc stevearc Dec 14, 2025

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Instead of using these extensions to extract the name, could you just adjust the treesitter queries? The @name capture group can be used to select the node that contains the name.

}

for _, lang in pairs(M) do
setmetatable(lang, { __index = default_methods })
end
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14 changes: 14 additions & 0 deletions queries/fennel/aerial.scm
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Original file line number Diff line number Diff line change
@@ -0,0 +1,14 @@
(lambda_form
(#set! "kind" "Function")) @symbol @root

(fn_form
(#set! "kind" "Function")) @symbol @root

(macro_form
(#set! "kind" "Function")) @symbol @root

(local_form
(#set! "kind" "Class")) @symbol @root

(var_form
(#set! "kind" "Struct")) @symbol @root
Comment on lines +10 to +14
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@stevearc stevearc Dec 14, 2025

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Do Struct and Class make sense for these? I would assume that this more naturally maps to the Variable type

87 changes: 87 additions & 0 deletions tests/symbols/fennel_test.json
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@@ -0,0 +1,87 @@
[
{
"col": 0,
"end_col": 15,
"end_lnum": 2,
"kind": "Function",
"level": 0,
"lnum": 1,
"name": "foo"
},
{
"col": 0,
"end_col": 15,
"end_lnum": 5,
"kind": "Function",
"level": 0,
"lnum": 4,
"name": "_m__"
},
{
"col": 0,
"end_col": 15,
"end_lnum": 10,
"kind": "Function",
"level": 0,
"lnum": 7,
"name": "bar",
"children": [
{
"col": 2,
"end_col": 16,
"end_lnum": 8,
"kind": "Struct",
"level": 1,
"lnum": 8,
"name": "test"
},
{
"col": 2,
"end_col": 24,
"end_lnum": 9,
"kind": "Function",
"level": 1,
"lnum": 9,
"name": "foo->bar?!"
}
]
},
{
"col": 0,
"end_col": 15,
"end_lnum": 13,
"kind": "Function",
"level": 0,
"lnum": 12,
"name": "_G.baz"
},
{
"col": 0,
"end_col": 34,
"end_lnum": 15,
"kind": "Class",
"level": 0,
"lnum": 15,
"name": "!Aa3?+-*/<=>$%^_",
"children": [
{
"col": 24,
"end_col": 33,
"end_lnum": 15,
"kind": "Function",
"level": 1,
"lnum": 15,
"name": "<Anonymous>"
}
]
},
{
"col": 0,
"end_col": 30,
"end_lnum": 16,
"kind": "Function",
"level": 0,
"lnum": 16,
"name": "!Aa3?+-*/<=>$%^_"
}
]
16 changes: 16 additions & 0 deletions tests/treesitter/fennel_test.fnl
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@@ -0,0 +1,16 @@
(fn foo []
(print :foo))

(macro _m__ []
`(+ 1 2 3 4))

(λ bar []
(var test nil)
(fn foo->bar?! [] nil)
(print :bar))

(lambda _G.baz []
(print :baz))

(local !Aa3?+-*/<=>$%^_ (fn [] 1))
(lambda !Aa3?+-*/<=>$%^_ [] 2)
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