fix: handle zsh's escaped history

Author: bczhc

src/history.rs

@@ -6,7 +6,7 @@ use std::{
     str::FromStr,
 };
 
-#[derive(Debug, Clone, strum::Display, strum::EnumString)]
+#[derive(Debug, Clone, strum::Display, strum::EnumString, Eq, PartialEq)]
 pub enum HistoryProvider {
     #[strum(serialize = "zsh")]
     Zsh,
@@ -68,6 +68,31 @@ impl History {
             buff_reader: BufReader::new(provider.history_stream()?),
         })
     }
+
+    /// Remove metadata from Zsh's escaped history for non-ASCII.
+    ///
+    /// Reference code: https://www.zsh.org/mla/users/2011/msg00154.html
+    ///
+    /// Note: this will mutate `line` in-place.
+    fn zsh_unmetafy(line: &mut [u8]) -> usize {
+        const ZSH_META: u8 = 0x83;
+
+        let Some(mut p) = line.iter().position(|&x| x == ZSH_META) else {
+            return line.len();
+        };
+        let mut t = p;
+        while p < line.len() {
+            line[t] = line[p];
+            p += 1;
+
+            if line[t] == ZSH_META {
+                line[t] = line[p] ^ 32;
+                p += 1;
+            }
+            t += 1;
+        }
+        t
+    }
 }
 
 impl Iterator for History {
@@ -83,6 +108,9 @@ impl Iterator for History {
                     if buf.is_empty() {
                         return if block.is_empty() { None } else { Some(block) };
                     }
+                    if self.provider == HistoryProvider::Zsh {
+                        Self::zsh_unmetafy(&mut buf);
+                    }
                     let str = String::from_utf8_lossy(&buf).trim_end().to_owned();
                     block += &str;
                     if str.is_empty() {