mirror: stop per-file lines resetting the progress gauge to 0%

parse_rclone_stats still accepted rclone's `Transferring:` entries
(`*  a.bin: 25% / 60 MiB, 0 B/s, -`) because they contain " / " and "%".
rclone writes them right after the byte-weighted line on every tick, and
since the last per-file entry is glued to the *next* tick's byte line,
the parsed order per second is: good byte line -> per-file 0% -> (one
second later) glued byte line. The gauge therefore displayed 0% almost
continuously and only ever looked right at the end.

Require a real stats body to start with the transferred byte amount.
Per-file lines now only feed the "current file" display (they already
did, as a fallback) and can no longer touch pct/done/total.

Verified with the real engine + rclone (bwlimit): mirror state now goes
0 -> 25 -> 50 -> 75 -> 100 with proper byte counts. The replay test now
asserts the exact parse sequence [10%, 40%] so a regression fails when a
per-file or file-count line sneaks in as 0%.

Bump to 0.3.1.

Cargo.lock

@@ -253,7 +253,7 @@ dependencies = [
 
 [[package]]
 name = "dap-tui"
-version = "0.3.0"
+version = "0.3.1"
 dependencies = [
  "anyhow",
  "chrono",

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "dap-tui"
-version = "0.3.0"
+version = "0.3.1"
 edition = "2021"
 description = "Device sync for portable players — TUI edition (ratatui)"
 license = "MIT"

src/engine.rs

@@ -944,6 +944,9 @@ mod tests {
         assert!(seen[1].contains("second stats line"));
     }
 
+
+
+
     #[cfg(unix)]
     fn process_is_alive(pid: i32) -> bool {
         match std::fs::read_to_string(format!("/proc/{pid}/stat")) {

src/progress.rs

@@ -193,6 +193,14 @@ pub fn parse_rclone_stats(line: &str) -> Option<RcloneStats> {
         return None;
     }
 
+    // A real byte-stats body starts with the transferred amount. This rejects
+    // per-file `Transferring` entries such as
+    // `*  a.bin: 25% / 60 MiB, 0 B/s, -`, which rclone emits right after the
+    // byte line on every tick. They used to parse as 0% and reset the gauge.
+    if !body.starts_with(|c: char| c.is_ascii_digit()) {
+        return None;
+    }
+
     let mut parts = body.split(',');
     let sizes = parts.next()?.trim();
     let (done, total) = sizes.split_once('/')?;
@@ -348,6 +356,20 @@ mod tests {
         assert!(parse_rclone_current(" * ").is_none());
     }
 
+    #[test]
+    fn rejects_rclone_per_file_lines() {
+        // Emitted every tick right after the byte line; must never reset the
+        // gauge to 0%.
+        assert!(parse_rclone_stats(
+            " *                                         a.bin: 25% / 60 MiB, 0 B/s, -"
+        )
+        .is_none());
+        assert!(parse_rclone_stats("*  big.bin:  5% / 40 MiB, 2.059 MiB/s, 18s").is_none());
+        // The glued variant still has to yield the trailing stats block.
+        let glued = "*  a.bin: 25% / 60 MiB, 0 B/s, -Transferred:   \t   60.086 MiB / 120 MiB, 50%, 30.041 MiB/s, ETA 1s";
+        assert_eq!(parse_rclone_stats(glued).unwrap().pct, 50);
+    }
+
     #[test]
     fn survives_real_rclone_progress_blocks() {
         // Captured from `rclone sync --progress --stats 1s` with a pipe: the
@@ -366,14 +388,16 @@ Transferring:
 Checks:                 0 / 0, -, Listed 7
 Transferred:            2 / 6, 33%
 ";
-        let mut last: Option<RcloneStats> = None;
+        // Only the two byte lines may parse; every per-file or count line must
+        // be rejected, so the gauge can never snap back to 0 between ticks.
+        let mut pcts = Vec::new();
         for line in sample.lines() {
             if let Some(p) = parse_rclone_stats(line) {
-                last = Some(p);
+                pcts.push(p.pct);
             }
         }
-        let last = last.expect("byte stats must parse");
+        assert_eq!(pcts, vec![10, 40]);
-        assert_eq!(last.pct, 40);
+        let last = parse_rclone_stats(sample.lines().nth(7).unwrap()).unwrap();
         assert_eq!(last.done, "32.082 MiB");
         assert_eq!(last.total, "80 MiB");
     }