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ImapDb.Database: Register new ICU-based tokeniser for FTS

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The SQLite tokeniser does not deal with scripts that do not use spaces
for word breaking (CJK, Thai, etc), thus searching in those languages
does not work well.

This adds a custom SQLite tokeniser based on ICU that breaks words for
all languages supported by that library, and uses NFKC_Casefold
normalisation to handle normalisation, case folding, and dropping of
ignorable characters.

Fixes #121
This commit is contained in:
Michael Gratton 2020-11-13 08:41:08 +11:00 • committed by Michael James Gratton
parent 90711f234e
commit 7e38198287
7 changed files with 325 additions and 13 deletions
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9
BUILDING.md
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@ -93,8 +93,9 @@ sudo dnf install meson vala desktop-file-utils enchant2-devel \
gnome-online-accounts-devel gspell-devel gsound-devel \
gtk3-devel iso-codes-devel itstool json-glib-devel \
libappstream-glib-devel libgee-devel libhandy1-devel \
libpeas-devel libsecret-devel libstemmer-devel libunwind-devel \
libxml2-devel libytnef-devel sqlite-devel webkitgtk4-devel
libpeas-devel libsecret-devel libicu-devel libstemmer-devel \
libunwind-devel libxml2-devel libytnef-devel sqlite-devel \
webkitgtk4-devel
```
Installing dependencies on Ubuntu/Debian
@ -108,8 +109,8 @@ sudo apt-get install meson build-essential valac \
libappstream-glib-dev libenchant-2-dev libfolks-dev \
libgcr-3-dev libgee-0.8-dev libglib2.0-dev libgmime-3.0-dev \
libgoa-1.0-dev libgspell-1-dev libgsound-dev libgtk-3-dev \
libjson-glib-dev libhandy-1-dev libpeas-dev libsecret-1-dev \
libsqlite3-dev libstemmer-dev libunwind-dev \
libjson-glib-dev libhandy-1-dev libicu-dev libpeas-dev \
libsecret-1-dev libsqlite3-dev libstemmer-dev libunwind-dev \
libwebkit2gtk-4.0-dev libxml2-dev libytnef0-dev
```