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lupdate - update Qt Linguist translation files


lupdate [ options ] project-file
lupdate [ options ] source-files -ts ts-files


This page documents the Qt Linguist Update tool for the Qt GUI toolkit. Lupdate reads a
qmake/tmake project file (.pro file), finds the translatable strings in the specified
source, header and interface files, and updates the translation files (.ts files)
specified in it. The translation files are given to the translator who uses Qt Linguist to
read the files and insert the translations.

The .ts file format is a simple human-readable XML format that can be used with version
control systems if required.


-disable-heuristic {sametext|similartext|number}
Disable the named merge heuristic. Can be specified multiple times.

-extensions <ext>[,<ext>...]
Process files with the given extensions only. The extension list must be separated
with commas, not with whitespace. Default:

-help Display the usage and exit.

-locations {absolute|relative|none}
Specify/override how source code references are saved in ts files. Default is

Drop all obsolete strings.

Do not recursively scan the following directories.

Do not sort contexts in .ts files.

Only include plural form messages.

-pro <filename>
Name of a .pro file. Useful for files with .pro file syntax but different file

Recursively scan the following directories.

Don't explain what is being done.

-source-language <language>[_<region>]
Specify/override the language of the source strings. Defaults to POSIX if not
specified and the file does not name it yet.

-target-language <language>[_<region>]
Specify/override the language of the translation. The target language is guessed
from the file name if this option is not specified and the file contents name no
language yet. -version Display the version of lupdate and exit.


Here is an example .pro file that can be given to lupdate:

HEADERS = funnydialog.h \
SOURCES = funnydialog.cpp \
main.cpp \
FORMS = fancybox.ui
TRANSLATIONS = gnomovision_dk.ts \
gnomovision_fi.ts \
gnomovision_no.ts \

When running lupdate on this project file, the translatable strings in all the files
listed in the HEADERS, SOURCES and FORMS entries will be put in the translation files
listed in the TRANSLATIONS entry. Previous translations will be reused as far as possible,
and translated strings that have vanished from the source files are marked obsolete.

lupdate can also be invoked with a list of C++ source files, .ui files and .ts files:

lupdate *.cpp *.h *.ui -ts gnomovision_dk.ts

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