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/****************************************************************************
**
** Copyright (C) 2018 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the Qt Creator documentation.
**
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU Free Documentation License Usage
** Alternatively, this file may be used under the terms of the GNU Free
** Documentation License version 1.3 as published by the Free Software
** Foundation and appearing in the file included in the packaging of
** this file. Please review the following information to ensure
** the GNU Free Documentation License version 1.3 requirements
** will be met: https://www.gnu.org/licenses/fdl-1.3.html.
**
****************************************************************************/
// **********************************************************************
// NOTE: the sections are not ordered by their logical order to avoid
// reshuffling the file each time the index order changes (i.e., often).
// Run the fixnavi.pl script to adjust the links to the index order.
// **********************************************************************
/*!
\contentspage index.html
\previouspage creator-language-servers.html
\page creator-mime-types.html
\nextpage creator-modeling.html
\title Editing MIME Types
\QC uses the \l{https://www.iana.org/assignments/media-types/media-types.xhtml}
{MIME type} of the file to determine which mode and editor to use for
opening the file. For example, \QC opens C++ source and header files in
the C++ editor, and Qt widget based UI files (.ui) in \QD.
For some MIME types, you can change the editor that is used to open the
files of that type by default.
To identify the MIME type of a file, \QC uses matching by pattern and
matching by contents. First, \QC looks at the filename to check whether it
matches the patterns specified for any MIME type. If no match is found, it
checks the contents of the file for magic headers specified for the file.
The magic headers can contain the following types of values: string, host,
big-endian, little-endian, and byte. \QC interprets the values according to
the
\l{http://standards.freedesktop.org/shared-mime-info-spec/shared-mime-info-spec-latest.html}
{Shared MIME-info Database specification}.
\QC searches for the value within a specified range in the files and takes
the priority of the magic header into account. If you specify wide search
ranges, openging files in \QC might take a long time. Therefore, you are
advised to use the recommended values for the range and priority of the
magic header.
If your files do not match the predefined MIME types, you can edit the
MIME types to add filename extensions and magic headers. You cannot add
new MIME types, however.
To edit MIME types:
\list 1
\li Select \uicontrol Tools > \uicontrol Options >
\uicontrol Environment > \uicontrol {MIME Types}.
\image qtcreator-mime-types.png "MIME Types"
\li In \uicontrol {MIME Type}, select a MIME type.
\li In \uicontrol Patterns, add the filename extension for the type of files
that you want to identify as having this MIME type.
\li Click \uicontrol Add to add \uicontrol {Magic Headers}.
\image qtcreator-mime-types-magic-header.png "Magic Header"
\li In the \uicontrol Value field, specify a text string or bytes that
appear in the files.
\li In the \uicontrol Type field, select the type of the value.
\li In the \uicontrol Mask field, specify the number to combine the
value in the file with using the AND operator before comparing it to
the specified value. You can specify any numbers as masks for
numerical types, whereas masks for strings must be in base 16, and
start with 0x.
\note You are recommended not to change the range and priority,
because it might cause problems when opening files in \QC.
\li In \uicontrol Handler, double-click the editor name to display a
context-menu where you can select another editor to open the file
in by default. The menu is available only if alternative suitable
editors are available.
\li Click \uicontrol OK.
\endlist
Even if an alternative editor is not listed for a MIME type, you can still
change the editor that is used to open the files of a particular type.
Remove the filename extension from the current MIME type and add it to a
MIME type that is handled by the editor you want to use. For example, to
edit Linux kernel device tree source (.dts) files with the text editor,
delete the pattern \c {*.dts} from the MIME type \c {audio/vnd.dts} (where
it represents the digital surround audio file format), and add it to the
\c {text/plain} MIME type. You can use the \uicontrol Filter field to find
the MIME type that currently contains a filename extension.
To revert the changes you have made to the MIME type definitions,
select \uicontrol {Reset MIME Types}. To revert the changes you have
made to the default editors, select \uicontrol {Reset Handlers}.
\note If you now select \uicontrol OK or \uicontrol Apply, you permanently lose all
your own patterns and magic headers. The changes are reverted the next
time you start \QC.
*/
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