Revamp bulid.zig discovery (#688)

* walk down tree instead of up for build.zig discovery

* account for windows URIs in tests

tests/lsp_features/inlay_hints.zig

@@ -1,5 +1,6 @@
 const std = @import("std");
 const zls = @import("zls");
+const builtin = @import("builtin");
 
 const helper = @import("../helper.zig");
 const Context = @import("../context.zig").Context;
@@ -73,7 +74,12 @@ fn testInlayHints(source: []const u8) !void {
     var ctx = try Context.init();
     defer ctx.deinit();
 
-    try ctx.requestDidOpen("file:///test.zig", phr.new_source);
+    const test_uri: []const u8 = switch (builtin.os.tag) {
+        .windows => "file:///C:\\test.zig",
+        else => "file:///test.zig",
+    };
+
+    try ctx.requestDidOpen(test_uri, phr.new_source);
 
     const range = types.Range{
         .start = types.Position{ .line = 0, .character = 0 },
@@ -88,7 +94,7 @@ fn testInlayHints(source: []const u8) !void {
 
     const request = requests.InlayHint{
         .params = .{
-            .textDocument = .{ .uri = "file:///test.zig" },
+            .textDocument = .{ .uri = test_uri },
             .range = range,
         },
     };
@@ -117,7 +123,7 @@ fn testInlayHints(source: []const u8) !void {
 
         for (hints) |hint| {
             if (position.line != hint.position.line or position.character != hint.position.character) continue;
-            
+
             const actual_label = hint.label[0 .. hint.label.len - 1]; // exclude :
 
             if (!std.mem.eql(u8, expected_label, actual_label)) {

tests/lsp_features/references.zig

@@ -1,5 +1,6 @@
 const std = @import("std");
 const zls = @import("zls");
+const builtin = @import("builtin");
 
 const helper = @import("../helper.zig");
 const Context = @import("../context.zig").Context;
@@ -85,7 +86,10 @@ test "references - label" {
 }
 
 fn testReferences(source: []const u8) !void {
-    const file_uri = "file:///test.zig";
+    const file_uri: []const u8 = switch (builtin.os.tag) {
+        .windows => "file:///C:\\test.zig",
+        else => "file:///test.zig",
+    };
     const new_name = "placeholder";
 
     var phr = try helper.collectReplacePlaceholders(allocator, source, new_name);

tests/lsp_features/semantic_tokens.zig

@@ -1,5 +1,6 @@
 const std = @import("std");
 const zls = @import("zls");
+const builtin = @import("builtin");
 
 const Context = @import("../context.zig").Context;
 
@@ -20,6 +21,11 @@ test "semantic tokens" {
     // TODO more tests
 }
 
+const file_uri = switch (builtin.os.tag) {
+    .windows => "file:///C:/test.zig",
+    else => "file:///test.zig",
+};
+
 fn testSemanticTokens(source: []const u8, expected: []const u32) !void {
     var ctx = try Context.init();
     defer ctx.deinit();
@@ -27,7 +33,7 @@ fn testSemanticTokens(source: []const u8, expected: []const u32) !void {
     const open_document = requests.OpenDocument{
         .params = .{
             .textDocument = .{
-                .uri = "file:///test.zig",
+                .uri = file_uri,
                 // .languageId = "zig",
                 // .version = 420,
                 .text = source,
@@ -47,7 +53,9 @@ fn testSemanticTokens(source: []const u8, expected: []const u32) !void {
     const expected_bytes = try std.json.stringifyAlloc(allocator, Response{ .data = expected }, .{});
     defer allocator.free(expected_bytes);
 
-    try ctx.request("textDocument/semanticTokens/full",
-        \\{"textDocument":{"uri":"file:///test.zig"}}
-    , expected_bytes);
+    try ctx.request(
+        "textDocument/semanticTokens/full",
+        "{\"textDocument\":{\"uri\":\"" ++ file_uri ++ "\"}}",
+        expected_bytes,
+    );
 }