CMake: Add _qmllint_json target

Adds an additional _qmllint_json target for use in CI settings and a
all_qmllint_json target to run all of them.

Since the output of ninja sub-commands can not be directly processed by
piping it into a script, the output of the qmllint command is instead
written to ${target}_qmllint.json.

[ChangeLog][qmllint][Important Behavior Changes] The --json option now has
a mandatory file argument and writes its output there. You may also pass
"-" to write it to stdout.

Fixes: QTBUG-95157
Change-Id: I3806c4113235d3aa06d3b3310e1cc7b0171b3eca
Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>

1 files changed, 13 insertions, 3 deletions

diff --git a/tools/qmllint/main.cpp b/tools/qmllint/main.cpp
index 8fd4d9d2a1..45252245f5 100644
--- a/tools/qmllint/main.cpp
+++ b/tools/qmllint/main.cpp
@@ -89,7 +89,8 @@ All warnings can be set to three levels:
     parser.addOption(silentOption);
 
     QCommandLineOption jsonOption(QStringList() << "json",
-                                  QLatin1String("Output linting errors as JSON"));
+                                  QLatin1String("Write output as JSON to file"),
+                                  QLatin1String("file"), QString());
     parser.addOption(jsonOption);
 
     QCommandLineOption writeDefaultsOption(
@@ -395,8 +396,17 @@ All warnings can be set to three levels:
         result[u"revision"_qs] = JSON_LOGGING_FORMAT_REVISION;
         result[u"files"_qs] = jsonFiles;
 
-        QTextStream(stdout) << QString::fromUtf8(
-                QJsonDocument(result).toJson(QJsonDocument::Compact));
+        QString fileName = parser.value(jsonOption);
+
+        const QByteArray json = QJsonDocument(result).toJson(QJsonDocument::Compact);
+
+        if (fileName == u"-") {
+            QTextStream(stdout) << QString::fromUtf8(json);
+        } else {
+            QFile file(fileName);
+            file.open(QFile::WriteOnly);
+            file.write(json);
+        }
     }
 
     return success ? 0 : -1;