MimeDatabase: Allow overriding pattern and magic matchers of mime types

Change-Id: I1e2f59c98ab69ccee1eb2eaa8bc6ce918302c6cb
Reviewed-by: David Schulz <david.schulz@theqtcompany.com>

src/libs/utils/mimetypes/mimedatabase.cpp

@@ -718,3 +718,17 @@ QMap<int, QList<MimeMagicRule> > MimeDatabase::magicRulesForMimeType(const MimeT
     QMutexLocker locker(&d->mutex);
     return d->provider()->magicRulesForMimeType(mimeType);
 }
+
+void MimeDatabase::setGlobPatternsForMimeType(const MimeType &mimeType, const QStringList &patterns)
+{
+    auto d = MimeDatabasePrivate::instance();
+    QMutexLocker locker(&d->mutex);
+    return d->provider()->setGlobPatternsForMimeType(mimeType, patterns);
+}
+
+void MimeDatabase::setMagicRulesForMimeType(const MimeType &mimeType, const QMap<int, QList<MimeMagicRule> > &rules)
+{
+    auto d = MimeDatabasePrivate::instance();
+    QMutexLocker locker(&d->mutex);
+    return d->provider()->setMagicRulesForMimeType(mimeType, rules);
+}

src/libs/utils/mimetypes/mimedatabase.h

@@ -89,6 +89,9 @@ public:
     static QStringList allGlobPatterns();
     static MimeType bestMatch(const QString &fileName, const QList<MimeType> &types);
     static QMap<int, QList<Internal::MimeMagicRule> > magicRulesForMimeType(const MimeType &mimeType); // priority -> rules
+    static void setGlobPatternsForMimeType(const MimeType &mimeType, const QStringList &patterns);
+    static void setMagicRulesForMimeType(const MimeType &mimeType,
+                                         const QMap<int, QList<Internal::MimeMagicRule> > &rules); // priority -> rules
 
 private:
     Internal::MimeDatabasePrivate *d;

src/libs/utils/mimetypes/mimeprovider.cpp

@@ -803,6 +803,32 @@ QMap<int, QList<MimeMagicRule> > MimeXMLProvider::magicRulesForMimeType(const Mi
     return result;
 }
 
+void MimeXMLProvider::setGlobPatternsForMimeType(const MimeType &mimeType, const QStringList &patterns)
+{
+    // remove all previous globs
+    m_mimeTypeGlobs.removeMimeType(mimeType.name());
+    // add new patterns as case-insensitive default-weight patterns
+    foreach (const QString &pattern, patterns)
+        addGlobPattern(MimeGlobPattern(pattern, mimeType.name()));
+    mimeType.d->globPatterns = patterns;
+}
+
+void MimeXMLProvider::setMagicRulesForMimeType(const MimeType &mimeType, const QMap<int, QList<MimeMagicRule> > &rules)
+{
+    // remove all previous rules
+    QMutableListIterator<MimeMagicRuleMatcher> matcherIt(m_magicMatchers);
+    while (matcherIt.hasNext()) {
+        if (matcherIt.next().mimetype() == mimeType.name())
+            matcherIt.remove();
+    }
+    // add new rules
+    for (auto it = rules.constBegin(); it != rules.constEnd(); ++it) {
+        MimeMagicRuleMatcher matcher(mimeType.name(), it.key()/*priority*/);
+        matcher.addRules(it.value());
+        addMagicMatcher(matcher);
+    }
+}
+
 void MimeXMLProvider::ensureLoaded()
 {
     if (!m_loaded /*|| shouldCheck()*/) {

src/libs/utils/mimetypes/mimeprovider_p.h

@@ -78,6 +78,8 @@ public:
     virtual QStringList bestMatchByFileName(const QString &fileName, const QList<MimeType> &types) = 0;
     virtual MimeType bestMatchByMagic(const QByteArray &data, const QList<MimeType> &types, int *accuracyPtr) = 0;
     virtual QMap<int, QList<MimeMagicRule> > magicRulesForMimeType(const MimeType &mimeType) = 0;
+    virtual void setGlobPatternsForMimeType(const MimeType &mimeType, const QStringList &patterns) = 0;
+    virtual void setMagicRulesForMimeType(const MimeType &mimeType, const QMap<int, QList<MimeMagicRule> > &rules) = 0;
 
     MimeDatabasePrivate *m_db;
 protected:
@@ -159,6 +161,8 @@ public:
     QStringList bestMatchByFileName(const QString &fileName, const QList<MimeType> &types);
     MimeType bestMatchByMagic(const QByteArray &data, const QList<MimeType> &types, int *accuracyPtr);
     QMap<int, QList<MimeMagicRule> > magicRulesForMimeType(const MimeType &mimeType);
+    void setGlobPatternsForMimeType(const MimeType &mimeType, const QStringList &patterns);
+    void setMagicRulesForMimeType(const MimeType &mimeType, const QMap<int, QList<MimeMagicRule> > &rules);
 
 private:
     void ensureLoaded();