diff options
author | Kirawi | 2021-07-02 14:54:50 +0000 |
---|---|---|
committer | GitHub | 2021-07-02 14:54:50 +0000 |
commit | c5b2973739901f8cd4bc26f3cfc8232249eb7968 (patch) | |
tree | 962117ed177c594a3192e8f651724db75ead7587 /helix-view/src/document.rs | |
parent | e177b27baf85611892b024453005808fed49707f (diff) |
`:reload` (#374)
* reloading functionality
* fn with_newline_eof()
* fmt
* wip
* wip
* wip
* wip
* moved to core, added simd feature for encoding_rs
* wip
* rm
* .gitignore
* wip
* local wip
* wip
* wip
* no features
* wip
* nit
* remove simd
* doc
* clippy
* clippy
* address comments
* add indentation & line ending change
Diffstat (limited to 'helix-view/src/document.rs')
-rw-r--r-- | helix-view/src/document.rs | 61 |
1 files changed, 53 insertions, 8 deletions
diff --git a/helix-view/src/document.rs b/helix-view/src/document.rs index 0f1f3a8f..f85ded11 100644 --- a/helix-view/src/document.rs +++ b/helix-view/src/document.rs @@ -307,6 +307,19 @@ pub async fn to_writer<'a, W: tokio::io::AsyncWriteExt + Unpin + ?Sized>( Ok(()) } +/// Inserts the final line ending into `rope` if it's missing. [Why?](https://stackoverflow.com/questions/729692/why-should-text-files-end-with-a-newline) +pub fn with_line_ending(rope: &mut Rope) -> LineEnding { + // search for line endings + let line_ending = auto_detect_line_ending(rope).unwrap_or(DEFAULT_LINE_ENDING); + + // add missing newline at the end of file + if rope.len_bytes() == 0 || !char_is_line_ending(rope.char(rope.len_chars() - 1)) { + rope.insert(rope.len_chars(), line_ending.as_str()); + } + + line_ending +} + /// Like std::mem::replace() except it allows the replacement value to be mapped from the /// original value. fn take_with<T, F>(mut_ref: &mut T, closure: F) @@ -449,14 +462,7 @@ impl Document { let mut file = std::fs::File::open(&path).context(format!("unable to open {:?}", path))?; let (mut rope, encoding) = from_reader(&mut file, encoding)?; - - // search for line endings - let line_ending = auto_detect_line_ending(&rope).unwrap_or(DEFAULT_LINE_ENDING); - - // add missing newline at the end of file - if rope.len_bytes() == 0 || !char_is_line_ending(rope.char(rope.len_chars() - 1)) { - rope.insert(rope.len_chars(), line_ending.as_str()); - } + let line_ending = with_line_ending(&mut rope); let mut doc = Self::from(rope, Some(encoding)); @@ -586,6 +592,45 @@ impl Document { } } + /// Reload the document from its path. + pub fn reload(&mut self, view_id: ViewId) -> Result<(), Error> { + let encoding = &self.encoding; + let path = self.path().filter(|path| path.exists()); + + // If there is no path or the path no longer exists. + if path.is_none() { + return Err(anyhow!("can't find file to reload from")); + } + + let mut file = std::fs::File::open(path.unwrap())?; + let (mut rope, ..) = from_reader(&mut file, Some(encoding))?; + let line_ending = with_line_ending(&mut rope); + + let transaction = helix_core::diff::compare_ropes(self.text(), &rope); + self.apply(&transaction, view_id); + self.append_changes_to_history(view_id); + + // Detect indentation style and set line ending. + self.detect_indent_style(); + self.line_ending = line_ending; + + Ok(()) + } + + /// Sets the [`Document`]'s encoding with the encoding correspondent to `label`. + pub fn set_encoding(&mut self, label: &str) -> Result<(), Error> { + match encoding_rs::Encoding::for_label(label.as_bytes()) { + Some(encoding) => self.encoding = encoding, + None => return Err(anyhow::anyhow!("unknown encoding")), + } + Ok(()) + } + + /// Returns the [`Document`]'s current encoding. + pub fn encoding(&self) -> &'static encoding_rs::Encoding { + self.encoding + } + fn detect_indent_style(&mut self) { // Build a histogram of the indentation *increases* between // subsequent lines, ignoring lines that are all whitespace. |