Finished refactoring out fs and rope

crates/util/Cargo.toml

@@ -7,21 +7,20 @@ edition = "2021"
 doctest = false
 
 [features]
-test-support = ["rand", "serde_json", "tempdir", "git2"]
+test-support = ["serde_json", "tempdir", "git2"]
 
 [dependencies]
 anyhow = "1.0.38"
 futures = "0.3"
 log = { version = "0.4.16", features = ["kv_unstable_serde"] }
 lazy_static = "1.4.0"
-rand = { version = "0.8", optional = true }
+rand = { workspace = true }
 tempdir = { version = "0.3.7", optional = true }
 serde_json = { version = "1.0", features = ["preserve_order"], optional = true }
 git2 = { version = "0.15", default-features = false, optional = true }
 
 
 [dev-dependencies]
-rand = { version = "0.8" }
 tempdir = { version = "0.3.7" }
 serde_json = { version = "1.0", features = ["preserve_order"] }
 git2 = { version = "0.15", default-features = false }

crates/util/src/lib.rs

@@ -2,6 +2,7 @@
 pub mod test;
 
 use futures::Future;
+use rand::{seq::SliceRandom, Rng};
 use std::{
     cmp::Ordering,
     ops::AddAssign,
@@ -155,6 +156,41 @@ pub fn defer<F: FnOnce()>(f: F) -> impl Drop {
     Defer(Some(f))
 }
 
+pub struct RandomCharIter<T: Rng>(T);
+
+impl<T: Rng> RandomCharIter<T> {
+    pub fn new(rng: T) -> Self {
+        Self(rng)
+    }
+}
+
+impl<T: Rng> Iterator for RandomCharIter<T> {
+    type Item = char;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        if std::env::var("SIMPLE_TEXT").map_or(false, |v| !v.is_empty()) {
+            return if self.0.gen_range(0..100) < 5 {
+                Some('\n')
+            } else {
+                Some(self.0.gen_range(b'a'..b'z' + 1).into())
+            };
+        }
+
+        match self.0.gen_range(0..100) {
+            // whitespace
+            0..=19 => [' ', '\n', '\r', '\t'].choose(&mut self.0).copied(),
+            // two-byte greek letters
+            20..=32 => char::from_u32(self.0.gen_range(('α' as u32)..('ω' as u32 + 1))),
+            // // three-byte characters
+            33..=45 => ['✋', '✅', '❌', '❎', '⭐'].choose(&mut self.0).copied(),
+            // // four-byte characters
+            46..=58 => ['🍐', '🏀', '🍗', '🎉'].choose(&mut self.0).copied(),
+            // ascii letters
+            _ => Some(self.0.gen_range(b'a'..b'z' + 1).into()),
+        }
+    }
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;