Fix a bug in qdocs handling of excludedirs

The bug was there because the way qdoc tries to exclude the directories
given in the "excludedirs" variable:
It did a simple string comparision on the candidate path (to include)
with every string in the "excludedirs" variable.

However, this did not work for all cases, since the paths are not
canonicalized.
For instance, the problem I faced was that the following qdocconf
fragment: (config file located in doc/qtwidgets.qdocconf)
sourcedirs  += ..
excludedirs += snippets

Since qdoc would recursively parse all subfolders of sourcedirs, it
would at one point visit the snippets folder, but it would have the
relative path "../doc/snippets", which did not match with "snippets",
causing snippets to not be excluded.

In addition, it seems that qdoc tries hard not to use absolute paths
(maybe because of more human-friendly error messages). I therefore
chose to canonicalize the relative paths.

As a side-effect this also give a better output from qdoc, as
../doc/foo.qdoc:42: Missing link
will become
foo.qdoc:42: Missing link

Change-Id: If9c25fa569abd03542bd12675acd44d8f4e0282c
Reviewed-by: Martin Smith <martin.smith@nokia.com>

src/tools/qdoc/config.cpp

@@ -327,6 +327,32 @@ QStringList Config::getStringList(const QString& var) const
     return stringListValueMap[var];
 }
 
+
+/*!
+   \brief Returns the a path list where all paths are canonicalized, then
+          made relative to the config file.
+   \param var The variable containing the list of paths.
+   \see   Location::canonicalRelativePath()
+ */
+QStringList Config::getCanonicalRelativePathList(const QString& var) const
+{
+    if (!locMap[var].isEmpty())
+        (Location&) lastLoc = locMap[var];
+    QStringList t;
+    QMap<QString,QStringList>::const_iterator it = stringListValueMap.constFind(var);
+    if (it != stringListValueMap.constEnd()) {
+        const QStringList& sl = it.value();
+        if (!sl.isEmpty()) {
+            t.reserve(sl.size());
+            for (int i=0; i<sl.size(); ++i) {
+                const QString &canonicalized = location().canonicalRelativePath(sl[i]);
+                t.append(canonicalized);
+            }
+        }
+    }
+    return t;
+}
+
 /*!
   This function should only be called when the configuration
   variable \a var maps to a string list that contains file paths.
@@ -465,13 +491,13 @@ QStringList Config::getAllFiles(const QString &filesVar,
                                 const QSet<QString> &excludedFiles)
 {
     QStringList result = getStringList(filesVar);
-    QStringList dirs = getStringList(dirsVar);
+    QStringList dirs = getCanonicalRelativePathList(dirsVar);
 
     QString nameFilter = getString(filesVar + dot + QLatin1String(CONFIG_FILEEXTENSIONS));
 
     QStringList::ConstIterator d = dirs.constBegin();
     while (d != dirs.constEnd()) {
-        result += getFilesHere(*d, nameFilter, excludedDirs, excludedFiles);
+        result += getFilesHere(*d, nameFilter, location(), excludedDirs, excludedFiles);
         ++d;
     }
     return result;
@@ -487,7 +513,7 @@ QStringList Config::getExampleQdocFiles()
 
     QStringList::ConstIterator d = dirs.constBegin();
     while (d != dirs.constEnd()) {
-        result += getFilesHere(*d, nameFilter, excludedDirs, excludedFiles);
+        result += getFilesHere(*d, nameFilter, location(), excludedDirs, excludedFiles);
         ++d;
     }
     return result;
@@ -948,10 +974,12 @@ void Config::load(Location location, const QString& fileName)
 
 QStringList Config::getFilesHere(const QString& uncleanDir,
                                  const QString& nameFilter,
+                                 const Location &location,
                                  const QSet<QString> &excludedDirs,
                                  const QSet<QString> &excludedFiles)
 {
-    QString dir = QDir::cleanPath(uncleanDir);
+    //
+    QString dir = location.isEmpty() ? QDir::cleanPath(uncleanDir) : location.canonicalRelativePath(uncleanDir);
     QStringList result;
     if (excludedDirs.contains(dir))
         return result;
@@ -981,7 +1009,7 @@ QStringList Config::getFilesHere(const QString& uncleanDir,
     fileNames = dirInfo.entryList();
     fn = fileNames.constBegin();
     while (fn != fileNames.constEnd()) {
-        result += getFilesHere(dirInfo.filePath(*fn), nameFilter, excludedDirs, excludedFiles);
+        result += getFilesHere(dirInfo.filePath(*fn), nameFilter, location, excludedDirs, excludedFiles);
         ++fn;
     }
     return result;

src/tools/qdoc/config.h

@@ -76,6 +76,7 @@ public:
     QString getString(const QString& var) const;
     QSet<QString> getStringSet(const QString& var) const;
     QStringList getStringList(const QString& var) const;
+    QStringList getCanonicalRelativePathList(const QString& var) const;
     QStringList getCleanPathList(const QString& var) const;
     QRegExp getRegExp(const QString& var) const;
     QList<QRegExp> getRegExpList(const QString& var) const;
@@ -88,6 +89,7 @@ public:
     QStringList getExampleQdocFiles();
     static QStringList getFilesHere(const QString& dir,
                                     const QString& nameFilter,
+                                    const Location &location = Location(),
                                     const QSet<QString> &excludedDirs = QSet<QString>(),
                                     const QSet<QString> &excludedFiles = QSet<QString>());
     static QString findFile(const Location& location,

src/tools/qdoc/doc/qdoc-manual.qdoc

@@ -5634,7 +5634,7 @@
     colons (\c{::}).
 
     \code
-        A link to the UI Component's TabWidget is \l {UIComponent::TabWidget}.
+        A link to the UI Component's TabWidget is \l {UIComponent::TabWidget}.
     \endcode
 
     QDoc will generate a page for the module with a listing of the members
@@ -7599,14 +7599,11 @@
     \l {sourcedirs-variable} {sourcedirs} or \l {headerdirs-variable} {headerdirs}
     variables.
 
-    For example in \l qt.qdocconf
+    For example,
 
     \code
-        excludedirs = $QTDIR/extensions/activeqt \
+        sourcedirs =  src/corelib
-                      $QTDIR/extensions/motif \
+        excludedirs = src/corelib/tmp
-                      $QTDIR/tools/designer/src/lib/extension \
-                      $QTDIR/tools/designer/src/lib/sdk \
-                      $QTDIR/tools/designer/src/lib/uilib
     \endcode
 
     When executed, QDoc will exclude the listed directories from

src/tools/qdoc/location.cpp

@@ -43,6 +43,7 @@
 #include "config.h"
 #include "location.h"
 
+#include <qdir.h>
 #include <qregexp.h>
 #include <stdlib.h>
 #include <limits.h>
@@ -225,6 +226,24 @@ QString Location::fileName() const
     return fp.mid(fp.lastIndexOf('/') + 1);
 }
 
+
+/*!
+ * \brief  Returns \a path which is canonicalized and relative to the config file.
+ *
+ *         QDir::relativeFilePath does not canonicalize the paths, so
+ *         if the config file is located at qtbase\src\widgets\doc\qtwidgets.qdocconf
+ *         and it has a reference to any ancestor folder (e.g. ".." or even "../doc")
+ * \param path
+ * \return
+ */
+QString Location::canonicalRelativePath(const QString &path) const
+{
+    QDir configFileDir(QFileInfo(filePath()).dir());
+    QDir dir(path);
+    const QString canon = dir.canonicalPath();
+    return configFileDir.relativeFilePath(canon);
+}
+
 /*! \fn int Location::lineNo() const
   Returns the current line number.
   Must not be called on an empty Location object.

src/tools/qdoc/location.h

@@ -79,6 +79,7 @@ public:
     int depth() const { return stkDepth; }
     const QString& filePath() const { return stkTop->filePath; }
     QString fileName() const;
+    QString canonicalRelativePath(const QString &path) const;
     int lineNo() const { return stkTop->lineNo; }
     int columnNo() const { return stkTop->columnNo; }
     bool etc() const { return etcetera; }

src/tools/qdoc/main.cpp

@@ -334,7 +334,7 @@ static void processQdocconfFile(const QString &fileName)
     QStringList excludedDirsList;
     QStringList excludedFilesList;
 
-    excludedDirsList = config.getCleanPathList(CONFIG_EXCLUDEDIRS);
+    excludedDirsList = config.getCanonicalRelativePathList(CONFIG_EXCLUDEDIRS);
     foreach (const QString &excludeDir, excludedDirsList) {
         QString p = QDir::fromNativeSeparators(excludeDir);
         excludedDirs.insert(p);