Use a temporary file for writes (#9236)

Co-authored-by: Pascal Kuthe <pascalkuthe@pm.me>

helix-term/tests/test/commands/write.rs

@@ -95,7 +95,7 @@ async fn test_buffer_close_concurrent() -> anyhow::Result<()> {
     .await?;
 
     helpers::assert_file_has_content(
-        file.as_file_mut(),
+        &mut file,
         &LineFeedHandling::Native.apply(&RANGE.end().to_string()),
     )?;
 
@@ -117,9 +117,7 @@ async fn test_write() -> anyhow::Result<()> {
     )
     .await?;
 
-    file.as_file_mut().flush()?;
-    file.as_file_mut().sync_all()?;
-
+    reload_file(&mut file).unwrap();
     let mut file_content = String::new();
     file.as_file_mut().read_to_string(&mut file_content)?;
 
@@ -148,12 +146,9 @@ async fn test_overwrite_protection() -> anyhow::Result<()> {
 
     test_key_sequence(&mut app, Some(":x<ret>"), None, false).await?;
 
-    file.as_file_mut().flush()?;
-    file.as_file_mut().sync_all()?;
-
-    file.rewind()?;
+    reload_file(&mut file).unwrap();
     let mut file_content = String::new();
-    file.as_file_mut().read_to_string(&mut file_content)?;
+    file.read_to_string(&mut file_content)?;
 
     assert_eq!("extremely important content", file_content);
 
@@ -175,11 +170,10 @@ async fn test_write_quit() -> anyhow::Result<()> {
     )
     .await?;
 
-    file.as_file_mut().flush()?;
-    file.as_file_mut().sync_all()?;
+    reload_file(&mut file).unwrap();
 
     let mut file_content = String::new();
-    file.as_file_mut().read_to_string(&mut file_content)?;
+    file.read_to_string(&mut file_content)?;
 
     assert_eq!(
         LineFeedHandling::Native.apply("the gostak distims the doshes"),
@@ -205,11 +199,9 @@ async fn test_write_concurrent() -> anyhow::Result<()> {
 
     test_key_sequence(&mut app, Some(&command), None, false).await?;
 
-    file.as_file_mut().flush()?;
-    file.as_file_mut().sync_all()?;
-
+    reload_file(&mut file).unwrap();
     let mut file_content = String::new();
-    file.as_file_mut().read_to_string(&mut file_content)?;
+    file.read_to_string(&mut file_content)?;
     assert_eq!(
         LineFeedHandling::Native.apply(&RANGE.end().to_string()),
         file_content
@@ -279,7 +271,7 @@ async fn test_write_scratch_to_new_path() -> anyhow::Result<()> {
     )
     .await?;
 
-    helpers::assert_file_has_content(file.as_file_mut(), &LineFeedHandling::Native.apply("hello"))?;
+    helpers::assert_file_has_content(&mut file, &LineFeedHandling::Native.apply("hello"))?;
 
     Ok(())
 }
@@ -324,7 +316,7 @@ async fn test_write_auto_format_fails_still_writes() -> anyhow::Result<()> {
     test_key_sequences(&mut app, vec![(Some(":w<ret>"), None)], false).await?;
 
     // file still saves
-    helpers::assert_file_has_content(file.as_file_mut(), "let foo = 0;\n")?;
+    helpers::assert_file_has_content(&mut file, "let foo = 0;\n")?;
 
     Ok(())
 }
@@ -363,12 +355,12 @@ async fn test_write_new_path() -> anyhow::Result<()> {
     .await?;
 
     helpers::assert_file_has_content(
-        file1.as_file_mut(),
+        &mut file1,
         &LineFeedHandling::Native.apply("i can eat glass, it will not hurt me\n"),
     )?;
 
     helpers::assert_file_has_content(
-        file2.as_file_mut(),
+        &mut file2,
         &LineFeedHandling::Native.apply("i can eat glass, it will not hurt me\n"),
     )?;
 
@@ -439,7 +431,7 @@ async fn test_write_insert_final_newline_added_if_missing() -> anyhow::Result<()
     test_key_sequence(&mut app, Some(":w<ret>"), None, false).await?;
 
     helpers::assert_file_has_content(
-        file.as_file_mut(),
+        &mut file,
         &LineFeedHandling::Native.apply("have you tried chamomile tea?\n"),
     )?;
 
@@ -457,7 +449,7 @@ async fn test_write_insert_final_newline_unchanged_if_not_missing() -> anyhow::R
     test_key_sequence(&mut app, Some(":w<ret>"), None, false).await?;
 
     helpers::assert_file_has_content(
-        file.as_file_mut(),
+        &mut file,
         &LineFeedHandling::Native.apply("ten minutes, please\n"),
     )?;
 
@@ -481,10 +473,8 @@ async fn test_write_insert_final_newline_unchanged_if_missing_and_false() -> any
 
     test_key_sequence(&mut app, Some(":w<ret>"), None, false).await?;
 
-    helpers::assert_file_has_content(
-        file.as_file_mut(),
-        "the quiet rain continued through the night",
-    )?;
+    reload_file(&mut file).unwrap();
+    helpers::assert_file_has_content(&mut file, "the quiet rain continued through the night")?;
 
     Ok(())
 }
@@ -510,12 +500,12 @@ async fn test_write_all_insert_final_newline_add_if_missing_and_modified() -> an
     .await?;
 
     helpers::assert_file_has_content(
-        file1.as_file_mut(),
+        &mut file1,
         &LineFeedHandling::Native.apply("we don't serve time travelers here\n"),
     )?;
 
     helpers::assert_file_has_content(
-        file2.as_file_mut(),
+        &mut file2,
         &LineFeedHandling::Native.apply("a time traveler walks into a bar\n"),
     )?;
 
@@ -534,7 +524,7 @@ async fn test_write_all_insert_final_newline_do_not_add_if_unmodified() -> anyho
 
     test_key_sequence(&mut app, Some(":wa<ret>"), None, false).await?;
 
-    helpers::assert_file_has_content(file.as_file_mut(), "i lost on Jeopardy!")?;
+    helpers::assert_file_has_content(&mut file, "i lost on Jeopardy!")?;
 
     Ok(())
 }
@@ -560,7 +550,7 @@ async fn edit_file_with_content(file_content: &[u8]) -> anyhow::Result<()> {
     )
     .await?;
 
-    file.rewind()?;
+    reload_file(&mut file).unwrap();
     let mut new_file_content: Vec<u8> = Vec::new();
     file.read_to_end(&mut new_file_content)?;
 

helix-term/tests/test/helpers.rs

@@ -1,5 +1,4 @@
 use std::{
-    fs::File,
     io::{Read, Write},
     mem::replace,
     path::PathBuf,
@@ -390,9 +389,8 @@ pub async fn run_event_loop_until_idle(app: &mut Application) {
     app.event_loop_until_idle(&mut rx_stream).await;
 }
 
-pub fn assert_file_has_content(file: &mut File, content: &str) -> anyhow::Result<()> {
-    file.flush()?;
-    file.sync_all()?;
+pub fn assert_file_has_content(file: &mut NamedTempFile, content: &str) -> anyhow::Result<()> {
+    reload_file(file)?;
 
     let mut file_content = String::new();
     file.read_to_string(&mut file_content)?;
@@ -406,3 +404,13 @@ pub fn assert_status_not_error(editor: &Editor) {
         assert_ne!(&Severity::Error, sev);
     }
 }
+
+pub fn reload_file(file: &mut NamedTempFile) -> anyhow::Result<()> {
+    let path = file.path();
+    let f = std::fs::OpenOptions::new()
+        .write(true)
+        .read(true)
+        .open(&path)?;
+    *file.as_file_mut() = f;
+    Ok(())
+}

helix-term/tests/test/splits.rs

@@ -62,18 +62,9 @@ async fn test_split_write_quit_all() -> anyhow::Result<()> {
     )
     .await?;
 
-    helpers::assert_file_has_content(
-        file1.as_file_mut(),
-        &LineFeedHandling::Native.apply("hello1"),
-    )?;
-    helpers::assert_file_has_content(
-        file2.as_file_mut(),
-        &LineFeedHandling::Native.apply("hello2"),
-    )?;
-    helpers::assert_file_has_content(
-        file3.as_file_mut(),
-        &LineFeedHandling::Native.apply("hello3"),
-    )?;
+    helpers::assert_file_has_content(&mut file1, &LineFeedHandling::Native.apply("hello1"))?;
+    helpers::assert_file_has_content(&mut file2, &LineFeedHandling::Native.apply("hello2"))?;
+    helpers::assert_file_has_content(&mut file3, &LineFeedHandling::Native.apply("hello3"))?;
 
     Ok(())
 }
@@ -131,10 +122,7 @@ async fn test_split_write_quit_same_file() -> anyhow::Result<()> {
     )
     .await?;
 
-    helpers::assert_file_has_content(
-        file.as_file_mut(),
-        &LineFeedHandling::Native.apply("hello\ngoodbye"),
-    )?;
+    helpers::assert_file_has_content(&mut file, &LineFeedHandling::Native.apply("hello\ngoodbye"))?;
 
     Ok(())
 }