[vcpkg] Emit parse errors to match '<file>:<line>:<col>: error: <text>' for better IDE compatibility (#15926)

Co-authored-by: Robert Schumacher <roschuma@microsoft.com>

3 files changed, 4 insertions, 5 deletions

diff --git a/toolsrc/src/vcpkg-test/json.cpp b/toolsrc/src/vcpkg-test/json.cpp
index 6858a5ac8..b03fe2aec 100644
--- a/toolsrc/src/vcpkg-test/json.cpp
+++ b/toolsrc/src/vcpkg-test/json.cpp
@@ -234,7 +234,7 @@ TEST_CASE ("JSON track newlines", "[json]")
     auto res = Json::parse("{\n,", fs::u8path("filename"));
     REQUIRE(!res);
     REQUIRE(res.error()->format() ==
-            R"(Error: filename:2:1: Unexpected character; expected property name
+            R"(filename:2:1: error: Unexpected character; expected property name
    on expression: ,
                   ^
 )");
diff --git a/toolsrc/src/vcpkg/base/json.cpp b/toolsrc/src/vcpkg/base/json.cpp
index d99fa7392..c287eae78 100644
--- a/toolsrc/src/vcpkg/base/json.cpp
+++ b/toolsrc/src/vcpkg/base/json.cpp
@@ -1062,7 +1062,7 @@ namespace vcpkg::Json
     ExpectedT<std::pair<Value, JsonStyle>, std::unique_ptr<Parse::IParseError>> parse(StringView json,
                                                                                       const fs::path& filepath) noexcept
     {
-        return Parser::parse(json, fs::generic_u8string(filepath));
+        return Parser::parse(json, fs::u8string(filepath));
     }
     ExpectedT<std::pair<Value, JsonStyle>, std::unique_ptr<Parse::IParseError>> parse(StringView json,
                                                                                       StringView origin) noexcept
diff --git a/toolsrc/src/vcpkg/base/parse.cpp b/toolsrc/src/vcpkg/base/parse.cpp
index a082c4d9c..fb1b4c3bf 100644
--- a/toolsrc/src/vcpkg/base/parse.cpp
+++ b/toolsrc/src/vcpkg/base/parse.cpp
@@ -34,13 +34,12 @@ namespace vcpkg::Parse
             caret_spacing.push_back(cp == '\t' ? '\t' : ' ');
         }
 
-        return Strings::concat("Error: ",
-                               origin,
+        return Strings::concat(origin,
                                ":",
                                row,
                                ":",
                                column,
-                               ": ",
+                               ": error: ",
                                message,
                                "\n"
                                "   on expression: ", // 18 columns