From 4ff17d31b3d35ca39944a0f2829e457e6b5dcdda Mon Sep 17 00:00:00 2001
From: Damien Elmes <gpg@ankiweb.net>
Date: Sat, 21 Mar 2020 12:40:20 +1000
Subject: [PATCH] add unicase collation

sqlite's like is hard-coded to use ASCII comparisons, so we can't
take advantage of this yet
---
 rslib/Cargo.toml            | 5 +++--
 rslib/src/storage/sqlite.rs | 8 ++++++++
 2 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/rslib/Cargo.toml b/rslib/Cargo.toml
index 58e5d5c90..627d96efa 100644
--- a/rslib/Cargo.toml
+++ b/rslib/Cargo.toml
@@ -38,12 +38,13 @@ slog-async = "2.4.0"
 slog-envlogger = "2.2.0"
 serde_repr = "0.1.5"
 num_enum = "0.4.2"
+unicase = "2.6.0"
 
 [target.'cfg(target_vendor="apple")'.dependencies]
-rusqlite = { version = "0.21.0", features = ["trace", "functions"] }
+rusqlite = { version = "0.21.0", features = ["trace", "functions", "collation"] }
 
 [target.'cfg(not(target_vendor="apple"))'.dependencies]
-rusqlite = { version = "0.21.0", features = ["trace", "functions", "bundled"] }
+rusqlite = { version = "0.21.0", features = ["trace", "functions", "collation", "bundled"] }
 
 [target.'cfg(linux)'.dependencies]
 reqwest = { version = "0.10.1", features = ["json", "native-tls-vendored"] }
diff --git a/rslib/src/storage/sqlite.rs b/rslib/src/storage/sqlite.rs
index e5502f90c..0d8a3936d 100644
--- a/rslib/src/storage/sqlite.rs
+++ b/rslib/src/storage/sqlite.rs
@@ -14,14 +14,20 @@ use crate::{
 };
 use regex::Regex;
 use rusqlite::{params, Connection, NO_PARAMS};
+use std::cmp::Ordering;
 use std::{
     collections::HashMap,
     path::{Path, PathBuf},
 };
+use unicase::UniCase;
 
 const SCHEMA_MIN_VERSION: u8 = 11;
 const SCHEMA_MAX_VERSION: u8 = 11;
 
+fn unicase_compare(s1: &str, s2: &str) -> Ordering {
+    UniCase::new(s1).cmp(&UniCase::new(s2))
+}
+
 // currently public for dbproxy
 #[derive(Debug)]
 pub struct SqliteStorage {
@@ -53,6 +59,8 @@ fn open_or_create_collection_db(path: &Path) -> Result<Connection> {
     add_field_index_function(&db)?;
     add_regexp_function(&db)?;
 
+    db.create_collation("unicase", unicase_compare)?;
+
     Ok(db)
 }