added function comments and signature

src/analysis.zig

@@ -2,10 +2,8 @@ const std = @import("std");
 
 /// REALLY BAD CODE, PLEASE DON'T USE THIS!!!!!!! (only for testing)
 pub fn getFunctionByName(tree: *std.zig.ast.Tree, name: []const u8) ?*std.zig.ast.Node.FnProto {
-    
     var decls = tree.root_node.decls.iterator(0);
     while (decls.next()) |decl_ptr| {
-
         var decl = decl_ptr.*;
         switch (decl.id) {
             .FnProto => {
@@ -14,11 +12,9 @@ pub fn getFunctionByName(tree: *std.zig.ast.Tree, name: []const u8) ?*std.zig.as
             },
             else => {}
         }
-
     }
 
     return null;
-
 }
 
 /// Gets a function's doc comments, caller must free memory when a value is returned
@@ -28,7 +24,6 @@ pub fn getFunctionByName(tree: *std.zig.ast.Tree, name: []const u8) ?*std.zig.as
 ///defer if (comments) |comments_pointer| allocator.free(comments_pointer);
 ///```
 pub fn getFunctionDocComments(allocator: *std.mem.Allocator, tree: *std.zig.ast.Tree, func: *std.zig.ast.Node.FnProto) !?[]const u8 {
-
     if (func.doc_comments) |doc_comments| {
         var doc_it = doc_comments.lines.iterator(0);
         var lines = std.ArrayList([]const u8).init(allocator);
@@ -41,5 +36,15 @@ pub fn getFunctionDocComments(allocator: *std.mem.Allocator, tree: *std.zig.ast.
     } else {
         return null;
     }
-
+}
+
+/// Gets a function definition (keywords, name, return value)
+pub fn getFunctionDefinition(tree: *std.zig.ast.Tree, func: *std.zig.ast.Node.FnProto) []const u8 {
+    var start = tree.tokens.at(func.firstToken()).start;
+    var end = 
+        if (func.body_node) |body| tree.tokens.at(body.firstToken()).start
+        else tree.tokens.at(switch (func.return_type) {
+            .Explicit, .InferErrorSet => |node| node.lastToken()
+        }).end;
+    return tree.source[start..end];
 }

src/main.zig

@@ -126,7 +126,7 @@ pub fn publishDiagnostics(document: types.TextDocument) !void {
 
 pub fn completeGlobal(id: i64, document: types.TextDocument) !void {
     const tree = try std.zig.parse(allocator, document.text);
-    defer tree.deinit();
+    // defer tree.deinit();
 
     if (tree.errors.len > 0) return try respondGeneric(id, no_completions_response);
 
@@ -140,10 +140,20 @@ pub fn completeGlobal(id: i64, document: types.TextDocument) !void {
         switch (decl.id) {
             .FnProto => {
                 const func = decl.cast(std.zig.ast.Node.FnProto).?;
+                var doc_comments = try analysis.getFunctionDocComments(allocator, tree, func);
+                defer if (doc_comments) |dc| allocator.free(dc);
+                // var abc = "abc";
+                // try log("{}", .{abc});
                 // if (std.mem.eql(u8, tree.tokenSlice(func.name_token.?), name)) return func;
+                var doc = types.MarkupContent{
+                    .kind = types.MarkupKind.Markdown,
+                    .value = doc_comments orelse ""
+                };
                 try completions.append(types.CompletionItem{
                     .label = tree.tokenSlice(func.name_token.?),
                     .kind = types.CompletionItemKind.Function,
+                    .documentation = doc,
+                    .detail = analysis.getFunctionDefinition(tree, func)
                 });
             },
             .VarDecl => {