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.. role:: bash(code)
:language: bash
.. role:: js(code)
:language: javascript
.. role:: python(code)
:language: python
===========================
Fluent to Fluent Migrations
===========================
It’s possible to migrate existing Fluent messages using :python:`COPY_PATTERN`
in a migration recipe. Unlike migrations from legacy content, it’s not possible
to interpolate the text, only to copy existing content without changes.
Consider for example a patch modifying an existing message to move the original
value to a :js:`alt` attribute.
Original message:
.. code-block:: fluent
about-logins-icon = Warning icon
.title = Breached website
New message:
.. code-block:: fluent
about-logins-breach-icon =
.alt = Warning icon
.title = Breached website
This type of changes requires a new message identifier, which in turn causes
existing translations to be lost. It’s possible to migrate the existing
translated content with:
.. code-block:: python
from fluent.migrate import COPY_PATTERN
ctx.add_transforms(
"browser/browser/aboutLogins.ftl",
"browser/browser/aboutLogins.ftl",
transforms_from(
"""
about-logins-breach-icon =
.alt = {COPY_PATTERN(from_path, "about-logins-icon")}
.title = {COPY_PATTERN(from_path, "about-logins-icon.title")}
""",from_path="browser/browser/aboutLogins.ftl"),
)
In this specific case, the destination and source files are the same. The dot
notation is used to access attributes: :js:`about-logins-icon.title` matches
the :js:`title` attribute of the message with identifier
:js:`about-logins-icon`, while :js:`about-logins-icon` alone matches the value
of the message.
.. warning::
Using the message identifier in :python:`COPY_PATTERN` will not migrate the
message as a whole, with all its attributes, only its value.
|
