From a03270f8917a5e5e6fd0c3ffcf3fb4f705e8cffa Mon Sep 17 00:00:00 2001
From: Marvin Scholz <epirat07@gmail.com>
Date: Sun, 28 Oct 2018 01:52:15 +0200
Subject: rcc: Add -d option to output a Makefile-syntax depfile
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The -d option makes rcc output a dependency file with the specified
file name.

The resulting dependency file is useful for make or ninja based build
systems.

[ChangeLog][Tools][rcc] Added -d option to generate a dependency file.

Fixes: QTBUG-45460
Change-Id: I495ade50f8d9865d4c00dce9373b2b6d1a6c8f2f
Reviewed-by: Jörg Bornemann <joerg.bornemann@qt.io>
---
 src/tools/rcc/main.cpp | 58 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 58 insertions(+)

(limited to 'src/tools')

diff --git a/src/tools/rcc/main.cpp b/src/tools/rcc/main.cpp
index 0eb6766b5a..ac87e48e39 100644
--- a/src/tools/rcc/main.cpp
+++ b/src/tools/rcc/main.cpp
@@ -99,6 +99,37 @@ int createProject(const QString &outFileName)
     return 0;
 }
 
+// Escapes a path for use in a Depfile (Makefile syntax)
+QString makefileEscape(const QString &filepath)
+{
+    // Always use forward slashes
+    QString result = QDir::cleanPath(filepath);
+    // Spaces are escaped with a backslash
+    result.replace(QLatin1Char(' '), QLatin1String("\\ "));
+    // Pipes are escaped with a backslash
+    result.replace(QLatin1Char('|'), QLatin1String("\\|"));
+    // Dollars are escaped with a dollar
+    result.replace(QLatin1Char('$'), QLatin1String("$$"));
+
+    return result;
+}
+
+void writeDepFile(QIODevice &iodev, const QStringList &depsList, const QString &targetName)
+{
+    QTextStream out(&iodev);
+    out << qPrintable(makefileEscape(targetName));
+    out << QLatin1Char(':');
+
+    // Write depfile
+    for (int i = 0; i < depsList.size(); ++i) {
+        out << QLatin1Char(' ');
+
+        out << qPrintable(makefileEscape(depsList.at(i)));
+    }
+
+    out << QLatin1Char('\n');
+}
+
 int runRcc(int argc, char *argv[])
 {
     QCoreApplication app(argc, argv);
@@ -176,6 +207,10 @@ int runRcc(int argc, char *argv[])
                                  QStringLiteral("Only output a mapping of resource paths to file system paths defined in the .qrc file, do not generate code."));
     parser.addOption(mapOption);
 
+    QCommandLineOption depFileOption(QStringList{QStringLiteral("d"), QStringLiteral("depfile")},
+                                     QStringLiteral("Write a depfile with the .qrc dependencies to <file>."), QStringLiteral("file"));
+    parser.addOption(depFileOption);
+
     QCommandLineOption projectOption(QStringLiteral("project"), QStringLiteral("Output a resource file containing all files from the current directory."));
     parser.addOption(projectOption);
 
@@ -266,6 +301,7 @@ int runRcc(int argc, char *argv[])
 
     QString outFilename = parser.value(outputOption);
     QString tempFilename = parser.value(tempOption);
+    QString depFilename = parser.value(depFileOption);
 
     if (projectRequested) {
         return createProject(outFilename);
@@ -352,6 +388,28 @@ int runRcc(int argc, char *argv[])
         return 0;
     }
 
+    // Write depfile
+    if (!depFilename.isEmpty()) {
+        QFile depout;
+        depout.setFileName(depFilename);
+
+        if (outFilename.isEmpty() || outFilename == QLatin1String("-")) {
+            const QString msg = QString::fromUtf8("Unable to write depfile when outputting to stdout!\n");
+            errorDevice.write(msg.toUtf8());
+            return 1;
+        }
+
+        if (!depout.open(QIODevice::WriteOnly | QIODevice::Text)) {
+            const QString msg = QString::fromUtf8("Unable to open depfile %1 for writing: %2\n")
+                    .arg(depout.fileName(), depout.errorString());
+            errorDevice.write(msg.toUtf8());
+            return 1;
+        }
+
+        writeDepFile(depout, library.dataFiles(), outFilename);
+        depout.close();
+    }
+
     QFile temp;
     if (!tempFilename.isEmpty()) {
         temp.setFileName(tempFilename);
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