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Major Changes to Mozc Since 2020

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Linux
ime
Mozc
tech

First draft: 2021-10-10

This is a summary of the major changes to Mozc since 2020. I have compiled information from documents, commit logs, and Issues, so there is no new information here. I will add any missing items later.

Please report problems or requests for Mozc to GitHub Issues or Discussions.

Build-related

Migration from Python 2 to Python 3

  • Migration to Python 3 has been completed

Migration from GYP to Bazel

  • Migration of the build tool from GYP to Bazel is in progress
  • (A tool in the same layer as Make)

Linux Build

  • Migration from GYP to Bazel completed
  • GYP is now in maintenance mode
  • New features are supported only in Bazel

macOS Build

  • Migrating to Bazel
  • GYP remains the primary build method
  • Building with Bazel is already possible (experimental)

Windows Build

Android Build

  • Migration from GYP to Bazel
  • Only Bazel is supported
  • Only the conversion engine (C++) is supported
  • Client (Java) code can be referenced from tag:2018-02-26

New Features Supported Only in Bazel

  • Additional dictionaries
  • ZIP code conversion
  • Qt-based candidate window (for IBus)
  • Icon images

Coding Style Updates

  • Conforms to the Google C++ Style Guide
  • Adopted up to C++17
    • However, it must be compatible with MS Visual Studio 2017
    • Lambda functions / Rvalue references / default and delete functions, etc.
  • Adoption of Abseil
    • Status / hash / string_view / string manipulation / time libraries, etc.
  • Targets Python 3.5 or later
    • Do not use f-strings (available from 3.6)
    • Do not use encoding in the subprocess module (available from 3.6)

New Features and Bug Fixes

Additional Dictionaries

ZIP Code Conversion

Qt-based Candidate Window (for IBus)

  • Migration from Gtk2 (Bazel build only)
  • issues/492
  • A problem where CPU consumption reaches 100% in some environments has been reported (under investigation)

Icon Images

  • Generation of tool icons etc. using SVG (Bazel build only)
  • issues/498

Compliance with XDG

  • Migration of the configuration directory from ~/.mozc to ~/.config/mozc
  • issues/474

Customizing Date Formats

Input Mode and Keyboard Layout in IBus

  • Initial input mode can be changed to Hiragana
  • Keyboard layout can be fixed to JIS layout, etc.
  • Managed in ~/config/.mozc/ibus_config.textproto
  • docs/configurations.md#ibus

Simultaneous Input (Timeout Input) Settings

  • Romaji settings such as "k → い", "d → か", "kd simultaneously → れ" are possible
  • issues/512

Removal of Bundled Features

  • Removal of the handwriting input tool and character palette
  • Code can be referenced from tag:2018-02-26

Crash in Anki (IBus)

  • Fixed. Out-of-spec values were being sent from the client.
  • issues/510

First Character Not Input in Chrome

  • In most cases, this is not a problem with Mozc
  • If you are using fcitx, switching to fcitx5 often resolves the issue

Pull Requests

Files and Directories Eligible for Pull Requests

Pull requests can be accepted for the following files and directories (Reference)

For administrative reasons, these are primarily files that are not referenced by GYP.

Conversion Test Data

Additional Dictionaries

GitHubで編集を提案

Discussion