[wip] implement handling "missing share"

- rework `CacheFile` API
- fix `AppState::{next_chunk, is_done}`

src/appstate.rs

@@ -9,7 +9,7 @@ use indicatif::{ProgressBar, ProgressStyle};
 use log::{debug, warn};
 
 use crate::{
-    cachefile::{CacheFile, FileState},
+    cachefile::CacheFile,
     cli::Cli,
     file::{self, Chunk, FileTrait},
     sharry::{self, Client},
@@ -89,7 +89,7 @@ impl AppState {
         })
     }
 
-    fn end_progressbar(&self, f: impl FnOnce(&ProgressBar)) {
+    fn drop_progressbar(&self, f: impl FnOnce(&ProgressBar)) {
         let mut slot = self.progress.borrow_mut();
         if let Some(bar) = slot.as_ref() {
             f(bar);
@@ -97,8 +97,8 @@ impl AppState {
         }
     }
 
-    fn next_chunk<'t>(&mut self, buffer: &'t mut [u8]) -> io::Result<Option<Chunk<'t>>> {
-        let Some(mut uploading) = self.inner.pop_file(&self.http) else {
+    fn next_chunk<'t>(&mut self, buffer: &'t mut [u8]) -> sharry::Result<Option<Chunk<'t>>> {
+        let Some(mut uploading) = self.inner.pop_uploading(&self.http)? else {
             self.inner
                 .share_notify(&self.http)
                 .unwrap_or_else(|e| warn!("Failed to notify the share: {e}"));
@@ -109,38 +109,32 @@ impl AppState {
 
         self.get_or_create_progressbar(&uploading);
 
-        let chunk_res = uploading.read(buffer);
-        self.inner.push_file(uploading);
+        let chunk = {
+            let result = uploading.read(buffer);
+            self.inner.push_uploading(uploading);
 
-        let chunk = chunk_res?;
+            result?
+        };
         debug!("{chunk:?}");
 
         Ok(Some(chunk))
     }
 
     fn is_done(&mut self) -> bool {
-        let Some(uploading) = self.inner.pop_file(&self.http) else {
-            return true;
-        };
-
-        match uploading.check_eof() {
-            Ok(uploading) => {
-                let bar = self.get_or_create_progressbar(&uploading);
+        if let Some(path) = self.inner.check_eof() {
+            debug!("Finished {:?}!", path.display());
+            self.drop_progressbar(ProgressBar::finish);
+        } else if let Some(uploading) = self.inner.peek_uploading() {
+            let bar = self.get_or_create_progressbar(uploading);
             bar.set_position(uploading.get_offset());
             // BUG in `indicatif` crate?
             // `set_position` does not force an immediate redraw, so we also call `inc_length` here
             bar.inc_length(0);
-                drop(bar);
 
-                self.inner.push_file(uploading);
-            }
-            Err(path) => {
-                debug!("Finished {:?}!", path.display());
-                self.end_progressbar(|pb| pb.finish());
-            }
+            return false;
         }
 
-        self.inner.is_empty()
+        self.inner.queue_empty()
     }
 
     pub fn upload_chunk(&mut self, buffer: &mut [u8]) -> sharry::Result<bool> {
@@ -183,7 +177,7 @@ impl AppState {
         let checked = uploading.abort();
         self.inner.requeue_file(checked);
 
-        self.end_progressbar(|pb| pb.abandon());
+        self.drop_progressbar(|pb| pb.abandon());
 
         Some(self)
     }

src/cachefile.rs

@@ -78,23 +78,41 @@ impl CacheFile {
         result
     }
 
-    pub fn start_upload(&mut self, client: &impl Client) -> sharry::Result<bool> {
-        if self.uploading.is_some() {
-            return Ok(true);
+    pub fn queue_empty(&self) -> bool {
+        self.files.is_empty()
     }
 
-        if let Some(chk) = self.files.pop_front() {
-            self.uploading =
-                Some(chk.start_upload(client, &self.uri, &self.alias_id, &self.share_id)?);
-
-            Ok(true)
+    pub fn pop_uploading(
+        &mut self,
+        client: &impl Client,
+    ) -> sharry::Result<Option<file::Uploading>> {
+        if let Some(upl) = self.uploading.take() {
+            Ok(Some(upl))
+        } else if let Some(chk) = self.files.pop_front() {
+            let upl = chk.start_upload(client, &self.uri, &self.alias_id, &self.share_id)?;
+            Ok(Some(upl))
         } else {
-            Ok(false)
+            Ok(None)
         }
     }
 
-    pub fn uploading(&mut self) -> &mut Option<file::Uploading> {
-        &mut self.uploading
+    pub fn push_uploading(&mut self, uploading: file::Uploading) {
+        self.uploading.replace(uploading);
+    }
+
+    pub fn peek_uploading(&self) -> Option<&file::Uploading> {
+        self.uploading.as_ref()
+    }
+
+    pub fn check_eof(&mut self) -> Option<PathBuf> {
+        if let Some(upl) = self.uploading.take() {
+            match upl.check_eof() {
+                Ok(upl) => self.push_uploading(upl),
+                Err(p) => return Some(p),
+            }
+        }
+
+        None
     }
 
     pub fn abort_upload(&mut self) {