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https://git.lyx.org/repos/lyx.git
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1fde43b690
This is rather incomplete, and will hopefully be extended in the future. Currently, its main purpose is to document file format updates and tests.
757 lines
16 KiB
Plaintext
757 lines
16 KiB
Plaintext
#LyX 2.1 created this file. For more info see http://www.lyx.org/
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\lyxformat 462
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\begin_document
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\begin_header
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\pdf_title "LyX's Development manual"
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\pdf_author "LyX Team"
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\pdf_subject "LyX's development documentation"
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\index Index
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\shortcut idx
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\end_index
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\secnumdepth 3
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\tocdepth 3
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\paragraph_separation indent
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\quotes_language english
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\html_be_strict true
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\end_header
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\begin_body
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\begin_layout Title
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Developing LyX
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\end_layout
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\begin_layout Subtitle
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Version 2.1.x
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\end_layout
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\begin_layout Author
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by the LyX Team
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\begin_inset Foot
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status collapsed
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\begin_layout Plain Layout
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\noindent
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If you have comments or error corrections, please send them to the LyX Documenta
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tion mailing list,
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\begin_inset Flex Code
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status collapsed
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\begin_layout Plain Layout
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\noindent
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<lyx-docs@lists.lyx.org>
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\end_layout
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\end_inset
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.
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\end_layout
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\end_inset
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\end_layout
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\begin_layout Standard
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\begin_inset CommandInset toc
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LatexCommand tableofcontents
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\end_inset
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\end_layout
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\begin_layout Chapter
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Introduction
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\end_layout
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\begin_layout Standard
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This manual documents some aspects of LyX development.
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It is currently rather incomplete, but will hopefully be extended in the
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future.
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Meanwhile, additional information can be found in the
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\begin_inset Flex Code
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status collapsed
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\begin_layout Plain Layout
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development
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\end_layout
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\end_inset
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subfolder of the LyX source code distribution.
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This document is not translated, since the development language of LyX
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is english.
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If you want to use LyX you don't need to read this manual.
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However, if you want to learn more about how LyX is developed, or even
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want to participate in LyX development, you may find some interesting informati
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on.
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\end_layout
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\begin_layout Chapter
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File formats
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\end_layout
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\begin_layout Standard
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LyX uses several custom file formats for configuration files and documents.
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This chapter contains some background concerning these file formats.
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Several file formats are also described in detail in the regular user documenta
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tion.
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\end_layout
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\begin_layout Section
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File Format Numbers
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\end_layout
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\begin_layout Section
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When is an update of the .lyx file format number needed?
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\end_layout
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\begin_layout Standard
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When you ware working on a new feature you may ask yourself whether it needs
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an update of the .lyx file format number.
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Whether an update is needed or not is not always obvious.
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Below you can find a list of reasons for file format updates with explanations:
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\end_layout
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\begin_layout Description
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New
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\begin_inset space ~
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\end_inset
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document
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\begin_inset space ~
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\end_inset
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setting Whenever you introduce a new setting that is stored in the document
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header, a file format update is needed.
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This is also true if you add a new valid value to an existing setting,
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e.g.
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a new language that is stored in
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\begin_inset Flex Code
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status collapsed
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\begin_layout Plain Layout
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\backslash
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language
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\end_layout
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\end_inset
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.
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\end_layout
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\begin_layout Description
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Removed
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\begin_inset space ~
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\end_inset
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document
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\begin_inset space ~
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\end_inset
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setting If a certain setting becomes obsolete and gets removed, a file format
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update is needed.
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\end_layout
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\begin_layout Description
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New
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\begin_inset space ~
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\end_inset
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inset Of course a new inset requires a file format update.
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\end_layout
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\begin_layout Description
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New
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\begin_inset space ~
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\end_inset
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style in any layout file or module shipped with LyX, or new shipped layout
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file or module.
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These requirements are currently under discussion and might change in the
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future.
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\end_layout
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\begin_layout Description
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Automatically
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\begin_inset space ~
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\end_inset
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loaded
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\begin_inset space ~
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\end_inset
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math
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\begin_inset space ~
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\end_inset
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package Any new math package that is automatically loaded needs a file format
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update.
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The reason for this is that there is no true ERT inset for math formulas:
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Each command is parsed, and if a user happens to defne a local command
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with the same name as a command that triggers an automatic load of a package,
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he needs to be able to switch off the automatic loading of that package.
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This switch is stored by the
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\begin_inset Flex Code
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status collapsed
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\begin_layout Plain Layout
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use_package
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\end_layout
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\end_inset
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header setting.
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\end_layout
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\begin_layout Standard
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If you are still unsure, please ask on the development list.
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\end_layout
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\begin_layout Section
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How to update the file format number of .lyx files
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\end_layout
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\begin_layout Standard
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Once you came to the conclusion that a file format update is needed you
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should use the following procedure to perform the update:
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\end_layout
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\begin_layout Enumerate
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Implement and test the new feature, including the reading and writing of
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.lyx files.
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Note that any file produced at this stage does not use a valid format,
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so do not use this version of LyX for working on any important documents.
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\end_layout
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\begin_layout Enumerate
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Describe the new format in
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\begin_inset Flex Code
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status collapsed
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\begin_layout Plain Layout
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development/FORMAT
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\end_layout
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\end_inset
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.
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\end_layout
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\begin_layout Enumerate
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Update the LyX file format number in
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\begin_inset Flex Code
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status collapsed
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\begin_layout Plain Layout
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src/version.h
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\end_layout
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\end_inset
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.
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\end_layout
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\begin_layout Enumerate
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Add an entry to both format lists (for conversion and reversion) in
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\begin_inset Flex Code
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status collapsed
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\begin_layout Plain Layout
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lib/lyx2lyx_lyx2lyx_2_1.py
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\end_layout
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\end_inset
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.
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Add a conversion routine if needed (e.g.
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a new header setting always needs a conversion that adds the new setting,
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a new document language does not need one).
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Add a reversion routine if needed.
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While the conversion routine is required to produce a document that is
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equivalent to the old version, the requirements of the reversion are not
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that strict.
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If possible, try to produce a proper reversion, using ERT if needed, but
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for some features this might be too complicated.
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In this case, the minimum requirement of the reversion routine is that
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it produces a valid document which can be read by an older LyX.
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If absolutely needed, even data loss is allowed for the reversion.
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\end_layout
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\begin_layout Enumerate
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Since tex2lyx has several implicit file format dependencies caused by sharing
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code with LyX, updating the file format of .lyx files produced by tex2lyx
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at the same time as updating the main .lyx file format is strongly recommended.
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Therefore, a compiler warning will be issued if the LyX and tex2lyx .lyx
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file format numbers differ.
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In many cases the tex2lyx update requires only the first and last item
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of the list below:
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\end_layout
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\begin_deeper
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\begin_layout Enumerate
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Update the tex2lyx file format number in
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\begin_inset Flex Code
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status collapsed
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\begin_layout Plain Layout
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src/version.h
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\end_layout
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\end_inset
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.
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\end_layout
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\begin_layout Enumerate
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If the lyx2lyx conversion from the old to the new format is empty, or if
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tex2lyx does not yet output the changed feature, you do not need any further
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tex2lyx changes.
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Otherwise, search for the changed feature in tex2lyx, and adjust the output
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according to the lyx2lyx changes.
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\end_layout
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\begin_layout Enumerate
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Update the tex2lyx test references as described in
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\begin_inset CommandInset ref
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LatexCommand formatted
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reference "sec:Updating-test-references"
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\end_inset
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.
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\end_layout
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\end_deeper
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\begin_layout Enumerate
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If you did not implement full tex2lyx support of the new feature, add a
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line to
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\begin_inset Flex Code
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status collapsed
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\begin_layout Plain Layout
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src/tex2lyx/TODO.txt
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\end_layout
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\end_inset
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describing the missing bits.
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Note that it is perfectly fine if you do not add full tex2lyx support for
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a new feature: The updating recommendation above is only issued for the
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syntax of the produced .lyx file.
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It is no problem if some features supported by LyX are still output as
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ERT by tex2lyx, since the problems in the past that resulted in the update
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recommendation were related to mixed version syntax, not ERT.
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\end_layout
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\begin_layout Chapter
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Tests
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\end_layout
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\begin_layout Standard
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Automated tests are an important tool to detect bugs and regressions in
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software development.
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Some projects like gcc even require each bug fix to be accompanied by a
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test case for the automatic test suite, that would detect this bug.
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Testing interactive features automatically is of course very hard, but
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core functionality like document import and export can be tested quite
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easily, and some tests of this kind exist.
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\end_layout
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\begin_layout Section
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LyX tests
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\end_layout
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\begin_layout Standard
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Some tests are located in the
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\begin_inset Flex Code
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status collapsed
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\begin_layout Plain Layout
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development/autotests
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\end_layout
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\end_inset
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subfolder of the LyX source code distribution.
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\end_layout
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\begin_layout Subsection
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Running the tests
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\end_layout
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\begin_layout Standard
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The LyX tests can be run by the commands
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\begin_inset Flex Code
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status collapsed
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\begin_layout Plain Layout
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make test
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\end_layout
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\end_inset
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(cmake) in the
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\begin_inset Flex Code
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status collapsed
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\begin_layout Plain Layout
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autotests
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\end_layout
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\end_inset
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subfolder of the build directory.
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\begin_inset Note Note
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status open
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\begin_layout Plain Layout
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FIXME: Is this possible with autotools?
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\end_layout
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\end_inset
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\end_layout
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\begin_layout Section
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tex2lyx tests
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\end_layout
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\begin_layout Standard
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The tex2lyx tests are located in the
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\begin_inset Flex Code
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status collapsed
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\begin_layout Plain Layout
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src/tex2lyx/test
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\end_layout
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\end_inset
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subfolder of the LyX source code distribution.
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The actual testing is performed by the simple python script
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\begin_inset Flex Code
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status collapsed
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\begin_layout Plain Layout
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src/tex2lyx/test/runtests.py
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\end_layout
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\end_inset
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.
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Each test consists of two files:
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\begin_inset Flex Code
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status collapsed
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\begin_layout Plain Layout
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<test name>.tex
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\end_layout
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\end_inset
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contains the LaTeX code that should be tested.
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\begin_inset Flex Code
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status collapsed
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\begin_layout Plain Layout
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<test name>.lyx.lyx
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\end_layout
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\end_inset
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contains the expected output of tex2lyx.
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When a test is run, the actual produced output is compared with the stored
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reference output.
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The test passes if both are identical.
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The test machinery is also able to generate a file
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\begin_inset Flex Code
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status collapsed
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\begin_layout Plain Layout
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<test name>.lyx.tex
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\end_layout
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\end_inset
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by exporting the produced .lyx file with LyX again.
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This may be useful for roundtrip comparisons.
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\end_layout
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\begin_layout Subsection
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Running the tests
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\end_layout
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\begin_layout Standard
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The tex2lyx tests can be run by the commands
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\begin_inset Flex Code
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status collapsed
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|
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\begin_layout Plain Layout
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make test
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\end_layout
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\end_inset
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(cmake) or
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\begin_inset Flex Code
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status collapsed
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\begin_layout Plain Layout
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make check
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\end_layout
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\end_inset
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(autotools) in the
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\begin_inset Flex Code
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status collapsed
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|
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\begin_layout Plain Layout
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src/tex2lyx
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\end_layout
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\end_inset
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subfolder of the build directory.
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If a test fails, the differences between the expected and actual results
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are output in unified diff format.
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\end_layout
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|
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\begin_layout Subsection
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|
Updating test references
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|
\begin_inset CommandInset label
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LatexCommand label
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name "sec:Updating-test-references"
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\end_inset
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|
|
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\end_layout
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|
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\begin_layout Standard
|
|
In some cases a changed tex2lyx output is not a test failure, but wanted,
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e.g.
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if a tex2lyx bug was fixed, or a new feature was added.
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In these cases the stored references need to be updated.
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|
To do so, call
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\begin_inset Flex Code
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|
status collapsed
|
|
|
|
\begin_layout Plain Layout
|
|
make updatetests
|
|
\end_layout
|
|
|
|
\end_inset
|
|
|
|
(autotools)
|
|
\begin_inset Note Note
|
|
status open
|
|
|
|
\begin_layout Plain Layout
|
|
FIXME: Add cmake command
|
|
\end_layout
|
|
|
|
\end_inset
|
|
|
|
in the
|
|
\begin_inset Flex Code
|
|
status collapsed
|
|
|
|
\begin_layout Plain Layout
|
|
src/tex2lyx
|
|
\end_layout
|
|
|
|
\end_inset
|
|
|
|
subfolder of the build directory.
|
|
For convenience, this command does also produce re-exported roundtrip .lyx.tex
|
|
files.
|
|
Please examine the changed output carefully before committing the changed
|
|
files to the repository: Since the test machinery does not do a roundtrip
|
|
test .tex
|
|
\begin_inset Formula $\Rightarrow$
|
|
\end_inset
|
|
|
|
.lyx
|
|
\begin_inset Formula $\Rightarrow$
|
|
\end_inset
|
|
|
|
.tex, and does not compare the produced dvi or pdf output, it assumes that
|
|
the stored .lyx reference produces correct output if processed by LyX.
|
|
There is only one chance to detect wrong output: before committing a new
|
|
reference.
|
|
Once it is committed, it is quite difficult to verify whether it is correct.
|
|
\end_layout
|
|
|
|
\begin_layout Subsection
|
|
Adding a new test
|
|
\end_layout
|
|
|
|
\begin_layout Standard
|
|
In many cases tests for new features may be added to one of the existing
|
|
test files, but sometimes this is not possible or not wanted.
|
|
Then a new test file needs to be added:
|
|
\end_layout
|
|
|
|
\begin_layout Enumerate
|
|
Create the new file
|
|
\begin_inset Flex Code
|
|
status collapsed
|
|
|
|
\begin_layout Plain Layout
|
|
src/tex2lyx/test/<test name>.tex
|
|
\end_layout
|
|
|
|
\end_inset
|
|
|
|
and run tex2lyx in roundtrip mode to produce the file
|
|
\begin_inset Flex Code
|
|
status collapsed
|
|
|
|
\begin_layout Plain Layout
|
|
src/tex2lyx/test/<test name>.lyx.lyx
|
|
\end_layout
|
|
|
|
\end_inset
|
|
|
|
.
|
|
This file will be the new reference.
|
|
\end_layout
|
|
|
|
\begin_layout Enumerate
|
|
Once you confirmed that the tex2lyx output is correct, add the new files
|
|
to the corresponding lists in
|
|
\begin_inset Flex Code
|
|
status collapsed
|
|
|
|
\begin_layout Plain Layout
|
|
src/tex2lyx/test/runtests.py
|
|
\end_layout
|
|
|
|
\end_inset
|
|
|
|
,
|
|
\begin_inset Flex Code
|
|
status collapsed
|
|
|
|
\begin_layout Plain Layout
|
|
src/tex2lyx/Makefile.am
|
|
\end_layout
|
|
|
|
\end_inset
|
|
|
|
and
|
|
\begin_inset Flex Code
|
|
status collapsed
|
|
|
|
\begin_layout Plain Layout
|
|
src/tex2lyx/test/CMakeLists.txt
|
|
\end_layout
|
|
|
|
\end_inset
|
|
|
|
.
|
|
\end_layout
|
|
|
|
\begin_layout Enumerate
|
|
Commit the changes to the repository, or send a patch to the development
|
|
list and ask for committing if you do not have commit rights.
|
|
\end_layout
|
|
|
|
\end_body
|
|
\end_document
|