feat(ts): Add support for elixir

README.md

@@ -123,6 +123,7 @@ automatically fetch symbols from treesitter.
 - c_sharp
 - cpp
 - dart
+- elixir
 - go
 - java
 - javascript

lua/aerial/backends/treesitter/extensions.lua

@@ -61,6 +61,40 @@ local function set_end_range(bufnr, items, last_line)
   end
 end
 
+M.elixir = {
+  kind_map = {
+    callback = "Function",
+    def = "Function",
+    defguard = "Function",
+    defimpl = "Class",
+    defmacro = "Function",
+    defmacrop = "Function",
+    defmodule = "Module",
+    defp = "Function",
+    defprotocol = "Interface",
+    defstruct = "Struct",
+    module_attribute = "Field",
+    spec = "TypeParameter",
+  },
+  postprocess = function(bufnr, item, match)
+    local identifier = (utils.get_at_path(match, "identifier") or {}).node
+    if identifier then
+      local name = get_node_text(identifier, bufnr) or "<parse error>"
+      item.kind = M.elixir.kind_map[name] or item.kind
+      if name == "callback" and item.parent then
+        item.parent.kind = "Interface"
+      elseif name == "defstruct" and item.parent then
+        item.parent.kind = "Struct"
+        return false
+      elseif name == "defimpl" then
+        local protocol = (utils.get_at_path(match, "protocol") or {}).node
+        local protocol_name = get_node_text(protocol, bufnr) or "<parse error>"
+        item.name = string.format("%s > %s", item.name, protocol_name)
+      end
+    end
+  end,
+}
+
 M.markdown = {
   get_parent = function(stack, match, node)
     local level_node = (utils.get_at_path(match, "level") or {}).node

lua/aerial/backends/treesitter/init.lua

@@ -100,7 +100,9 @@ M.fetch_symbols_sync = function(bufnr)
       col = col,
       end_col = end_col,
     }
-    ext.postprocess(bufnr, item, match)
+    if ext.postprocess(bufnr, item, match) == false then
+      goto continue
+    end
     if item.parent then
       if not item.parent.children then
         item.parent.children = {}

lua/aerial/backends/treesitter/language_kind_map.lua

@@ -28,6 +28,9 @@ return {
     method_signature = "Method",
     enum_declaration = "Enum",
   },
+  elixir = {
+    call = "Function",
+  },
   go = {
     function_declaration = "Function",
     method_declaration = "Method",

queries/elixir/aerial.scm

@@ -0,0 +1,38 @@
+(call
+  target: (identifier) @identifier (#any-of? @identifier "defmodule" "defprotocol")
+  (arguments) @name) @type
+
+(call
+  target: (identifier) @identifier (#eq? @identifier "defimpl")
+  (arguments
+    (alias) @protocol
+    (keywords (pair
+                key: (keyword) @kw (#match? @kw "^for:")
+                value: (alias) @name))
+    )) @type
+
+(call
+  target: (identifier) @identifier (#any-of? @identifier "def" "defp" "defguard" "defmacro" "defmacrop")
+  (arguments [
+              (call target: (identifier) @name)
+              (binary_operator left: (call target: (identifier) @name))
+   ])) @type
+
+(unary_operator
+  operand: (call
+              target: (identifier) @identifier (#any-of? @identifier "callback" "spec")
+  (arguments [
+              (call target: (identifier) @name)
+              (binary_operator left: (call target: (identifier) @name))
+  ])) @type) @start
+
+(unary_operator
+  operand: (call
+    target: (identifier) @identifier (#eq? @identifier "module_attribute")
+    (arguments) @name
+    ) @type
+  ) @start
+
+(do_block
+  (call
+    target: (identifier) @identifier (#eq? @identifier "defstruct")) @type) @start

tests/treesitter/elixir_spec.lua

@@ -0,0 +1,169 @@
+local util = require("tests.test_util")
+
+describe("treesitter elixir", function()
+  it("parses all symbols correctly", function()
+    util.test_file_symbols("treesitter", "./tests/treesitter/elixir_test.exs", {
+      {
+        kind = "Module",
+        name = "Example.Module",
+        level = 0,
+        lnum = 1,
+        col = 0,
+        end_lnum = 19,
+        end_col = 3,
+        children = {
+          {
+            kind = "Field",
+            name = ":value",
+            level = 1,
+            lnum = 2,
+            col = 2,
+            end_lnum = 2,
+            end_col = 26,
+          },
+          {
+            kind = "Function",
+            name = "public_function",
+            level = 1,
+            lnum = 4,
+            col = 2,
+            end_lnum = 5,
+            end_col = 5,
+          },
+          {
+            kind = "Function",
+            name = "private_function",
+            level = 1,
+            lnum = 7,
+            col = 2,
+            end_lnum = 8,
+            end_col = 5,
+          },
+          {
+            kind = "Function",
+            name = "public_guard",
+            level = 1,
+            lnum = 10,
+            col = 2,
+            end_lnum = 10,
+            end_col = 42,
+          },
+          {
+            kind = "Function",
+            name = "private_guard",
+            level = 1,
+            lnum = 12,
+            col = 2,
+            end_lnum = 12,
+            end_col = 43,
+          },
+          {
+            kind = "Function",
+            name = "public_macro",
+            level = 1,
+            lnum = 14,
+            col = 2,
+            end_lnum = 15,
+            end_col = 5,
+          },
+          {
+            kind = "Function",
+            name = "private_macro",
+            level = 1,
+            lnum = 17,
+            col = 2,
+            end_lnum = 18,
+            end_col = 5,
+          },
+        },
+      },
+      {
+        kind = "Interface",
+        name = "Example.Behaviour",
+        level = 0,
+        lnum = 21,
+        col = 0,
+        end_lnum = 23,
+        end_col = 3,
+        children = {
+          {
+            kind = "Function",
+            name = "example_function",
+            level = 1,
+            lnum = 22,
+            col = 2,
+            end_lnum = 22,
+            end_col = 46,
+          },
+        },
+      },
+      {
+        kind = "Struct",
+        name = "Example.Struct",
+        level = 0,
+        lnum = 25,
+        col = 0,
+        end_lnum = 27,
+        end_col = 3,
+      },
+      {
+        kind = "Interface",
+        name = "Example.Protocol",
+        level = 0,
+        lnum = 29,
+        col = 0,
+        end_lnum = 32,
+        end_col = 3,
+        children = {
+          {
+            kind = "TypeParameter",
+            name = "public_function_head",
+            level = 1,
+            lnum = 30,
+            col = 2,
+            end_lnum = 30,
+            end_col = 50,
+          },
+          {
+            kind = "Function",
+            name = "public_function_head",
+            level = 1,
+            lnum = 31,
+            col = 2,
+            end_lnum = 31,
+            end_col = 39,
+          },
+        },
+      },
+      {
+        kind = "Class",
+        name = "Map > Example.Protocol",
+        level = 0,
+        lnum = 34,
+        col = 0,
+        end_lnum = 39,
+        end_col = 3,
+        children = {
+          {
+            kind = "TypeParameter",
+            name = "public_function_head",
+            level = 1,
+            lnum = 35,
+            col = 2,
+            end_lnum = 35,
+            end_col = 56,
+          },
+          {
+            kind = "Function",
+            name = "public_function_head",
+            level = 1,
+            lnum = 36,
+            col = 2,
+            end_lnum = 38,
+            end_col = 5,
+          },
+        },
+      },
+    })
+  end)
+end)

tests/treesitter/elixir_test.exs

@@ -0,0 +1,39 @@
+defmodule Example.Module do
+  @module_attribute :value
+
+  def public_function() do
+  end
+
+  defp private_function() do
+  end
+
+  defguard public_guard(x) when is_atom(x)
+
+  defguard private_guard(x) when is_atom(x)
+
+  defmacro public_macro() do
+  end
+
+  defmacrop private_macro() do
+  end
+end
+
+defmodule Example.Behaviour do
+  @callback example_function(atom()) :: atom()
+end
+
+defmodule Example.Struct do
+  defstruct name: nil, age: nil
+end
+
+defprotocol Example.Protocol do
+  @spec public_function_head(t, atom()) :: boolean
+  def public_function_head(target, opt)
+end
+
+defimpl Example.Protocol, for: Map do
+  @spec public_function_head(Map.t(), atom()) :: boolean
+  def public_function_head(target, opt) do
+    true
+  end
+end