add Utils::QtcProcess

this is a wrapper around QProcess with these features:
- setEnvironment() takes a Utils::Environment instead of a QStringList
- instead of taking a stringlist with arguments, take a single shell
  command string which is fully compatible with the system's native
  shell (the bourne shell on unix and cmd.exe on windows) - with support
  for environment variable expansion, and subject to the shell's
  splitting and quoting rules. if the command is too complex (e.g.,
  contains redirections), it is transparently executed through a real
  shell.
- additionally, the class contains a set of helper functions for
  manipulating (constructing, splitting, etc.) shell command lines.
  in particular, it contains a shell-safe macro expander and the nested
  class ArgIterator which can be used for inspecting and manipulating a
  shell command line without going through the stringlist indirection
  (which is potentially lossy).

some of this is based on KDE code (KShell and KMacroExpander) which i
have written myself.

src/libs/utils/qtcprocess.h

+/**************************************************************************
+**
+** This file is part of Qt Creator
+**
+** Copyright (c) 2010 Nokia Corporation and/or its subsidiary(-ies).
+**
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** Commercial Usage
+**
+** Licensees holding valid Qt Commercial licenses may use this file in
+** accordance with the Qt Commercial License Agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and Nokia.
+**
+** GNU Lesser General Public License Usage
+**
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at http://qt.nokia.com/contact.
+**
+**************************************************************************/
+
+#ifndef QTCPROCESS_H
+#define QTCPROCESS_H
+
+#include <QProcess>
+
+#include "utils_global.h"
+
+#include "environment.h"
+
+namespace Utils {
+class AbstractMacroExpander;
+
+/*!
+  This class provides functionality for dealing with shell-quoted process arguments.
+*/
+class QTCREATOR_UTILS_EXPORT QtcProcess : public QProcess
+{
+    Q_OBJECT
+
+public:
+    QtcProcess(QObject *parent = 0) : QProcess(parent), m_haveEnv(false) {}
+    void setEnvironment(const Environment &env)
+        { m_environment = env; m_haveEnv = true; }
+    void setCommand(const QString &command, const QString &arguments)
+        { m_command = command; m_arguments = arguments; }
+    void start();
+
+    enum SplitError {
+        SplitOk = 0, //! All went just fine
+        BadQuoting, //! Command contains quoting errors
+        FoundMeta //! Command contains complex shell constructs
+    };
+
+    //! Quote a single argument for usage in a unix shell command
+    static QString quoteArgUnix(const QString &arg);
+    //! Quote a single argument and append it to a unix shell command
+    static void addArgUnix(QString *args, const QString &arg);
+    //! Join an argument list into a unix shell command
+    static QString joinArgsUnix(const QStringList &args);
+#ifdef Q_OS_WIN
+    //! Quote a single argument for usage in a shell command
+    static QString quoteArg(const QString &arg);
+    //! Quote a single argument and append it to a shell command
+    static void addArg(QString *args, const QString &arg);
+    //! Join an argument list into a shell command
+    static QString joinArgs(const QStringList &args);
+    //! Prepare argument of a shell command for feeding into QProcess
+    static QString prepareArgs(const QString &cmd, SplitError *err,
+                               const Environment *env = 0, const QString *pwd = 0);
+    //! Prepare a shell command for feeding into QProcess
+    static void prepareCommand(const QString &command, const QString &arguments,
+                               QString *outCmd, QString *outArgs,
+                               const Environment *env = 0, const QString *pwd = 0);
+#else
+    static QString quoteArg(const QString &arg) { return quoteArgUnix(arg); }
+    static void addArg(QString *args, const QString &arg) { addArgUnix(args, arg); }
+    static QString joinArgs(const QStringList &args) { return joinArgsUnix(args); }
+    static QStringList prepareArgs(const QString &cmd, SplitError *err,
+                                   const Environment *env = 0, const QString *pwd = 0)
+        { return splitArgs(cmd, true, err, env, pwd); }
+    static bool prepareCommand(const QString &command, const QString &arguments,
+                               QString *outCmd, QStringList *outArgs,
+                               const Environment *env = 0, const QString *pwd = 0);
+#endif
+    //! Quote and append each argument to a shell command
+    static void addArgs(QString *args, const QStringList &inArgs);
+    //! Append already quoted arguments to a shell command
+    static void addArgs(QString *args, const QString &inArgs);
+    //! Split a shell command into separate arguments. ArgIterator is usually a better choice.
+    static QStringList splitArgs(const QString &cmd, bool abortOnMeta = false, SplitError *err = 0,
+                                 const Environment *env = 0, const QString *pwd = 0);
+    //! Safely replace the expandos in a shell command
+    static bool expandMacros(QString *cmd, AbstractMacroExpander *mx);
+    static QString expandMacros(const QString &str, AbstractMacroExpander *mx);
+
+    /*! Iterate over arguments from a command line.
+     *  Assumes that the name of the actual command is *not* part of the line.
+     *  Terminates after the first command if the command line is complex.
+     */
+    class QTCREATOR_UTILS_EXPORT ArgIterator {
+    public:
+        ArgIterator(QString *str) : m_str(str), m_pos(0), m_prev(-1) {}
+        //! Get the next argument. Returns false on encountering end of first command.
+        bool next();
+        //! True iff the argument is a plain string, possibly after unquoting.
+        bool isSimple() const { return m_simple; }
+        //! Return the string value of the current argument if it is simple, otherwise empty.
+        QString value() const { return m_value; }
+        //! Delete the last argument fetched via next() from the command line.
+        void deleteArg();
+        //! Insert argument into the command line after the last one fetched via next().
+        //! This may be used before the first call to next() to insert at the front.
+        void appendArg(const QString &str);
+    private:
+        QString *m_str, m_value;
+        int m_pos, m_prev;
+        bool m_simple;
+    };
+
+    class QTCREATOR_UTILS_EXPORT ConstArgIterator {
+    public:
+        ConstArgIterator(const QString &str) : m_str(str), m_ait(&m_str) {}
+        bool next() { return m_ait.next(); }
+        bool isSimple() const { return m_ait.isSimple(); }
+        QString value() const { return m_ait.value(); }
+    private:
+        QString m_str;
+        ArgIterator m_ait;
+    };
+
+private:
+    QString m_command;
+    QString m_arguments;
+    Environment m_environment;
+    bool m_haveEnv;
+};
+
+}
+
+#endif // QTCPROCESS_H

src/libs/utils/utils-lib.pri

@@ -8,6 +8,7 @@ INCLUDEPATH += $$PWD
 QT += network
 
 SOURCES += $$PWD/environment.cpp \
+    $$PWD/qtcprocess.cpp \
     $$PWD/reloadpromptutils.cpp \
     $$PWD/stringutils.cpp \
     $$PWD/filesearch.cpp \
@@ -66,6 +67,7 @@ unix:!macx {
     SOURCES += $$PWD/unixutils.cpp
 }
 HEADERS += $$PWD/environment.h \
+    $$PWD/qtcprocess.h \
     $$PWD/utils_global.h \
     $$PWD/reloadpromptutils.h \
     $$PWD/stringutils.h \

tests/auto/auto.pro

@@ -12,6 +12,7 @@ SUBDIRS += \
 #    icheckbuild \
 #    profilewriter \
     ioutils \
+    qtcprocess \
     utils_stringutils \
     filesearch
 

tests/auto/qtcprocess/qtcprocess.pro

+CONFIG += qtestlib testcase
+TEMPLATE = app
+CONFIG -= app_bundle
+DEFINES += QTCREATOR_UTILS_LIB
+
+UTILS_PATH = ../../../src/libs/utils
+
+INCLUDEPATH += $$UTILS_PATH/..
+DEPENDPATH += $$UTILS_PATH/..
+
+SOURCES += \
+    tst_qtcprocess.cpp \
+    $$UTILS_PATH/qtcprocess.cpp \
+    $$UTILS_PATH/stringutils.cpp \
+    $$UTILS_PATH/environment.cpp
+HEADERS += \
+    $$UTILS_PATH/qtcprocess.h \
+    $$UTILS_PATH/environment.h \
+    $$UTILS_PATH/stringutils.h \
+    $$UTILS_PATH/utils_global.h
+
+TARGET = tst_$$TARGET