ZIm/crates/ai/src/refactoring_assistant.rs
2023-08-24 15:46:18 +02:00

252 lines
11 KiB
Rust

use collections::HashMap;
use editor::{Editor, ToOffset, ToPoint};
use futures::{channel::mpsc, SinkExt, StreamExt};
use gpui::{AppContext, Task, ViewHandle};
use language::{Point, Rope};
use std::{cmp, env, fmt::Write};
use util::TryFutureExt;
use crate::{
stream_completion,
streaming_diff::{Hunk, StreamingDiff},
OpenAIRequest, RequestMessage, Role,
};
pub struct RefactoringAssistant {
pending_edits_by_editor: HashMap<usize, Task<Option<()>>>,
}
impl RefactoringAssistant {
fn new() -> Self {
Self {
pending_edits_by_editor: Default::default(),
}
}
pub fn update<F, T>(cx: &mut AppContext, f: F) -> T
where
F: FnOnce(&mut Self, &mut AppContext) -> T,
{
if !cx.has_global::<Self>() {
cx.set_global(Self::new());
}
cx.update_global(f)
}
pub fn refactor(
&mut self,
editor: &ViewHandle<Editor>,
user_prompt: &str,
cx: &mut AppContext,
) {
let api_key = if let Ok(api_key) = env::var("OPENAI_API_KEY") {
api_key
} else {
// TODO: ensure the API key is present by going through the assistant panel's flow.
return;
};
let snapshot = editor.read(cx).buffer().read(cx).snapshot(cx);
let selection = editor.read(cx).selections.newest_anchor().clone();
let selected_text = snapshot
.text_for_range(selection.start..selection.end)
.collect::<Rope>();
let mut normalized_selected_text = selected_text.clone();
let mut base_indentation: Option<language::IndentSize> = None;
let selection_start = selection.start.to_point(&snapshot);
let selection_end = selection.end.to_point(&snapshot);
if selection_start.row < selection_end.row {
for row in selection_start.row..=selection_end.row {
if snapshot.is_line_blank(row) {
continue;
}
let line_indentation = snapshot.indent_size_for_line(row);
if let Some(base_indentation) = base_indentation.as_mut() {
if line_indentation.len < base_indentation.len {
*base_indentation = line_indentation;
}
} else {
base_indentation = Some(line_indentation);
}
}
}
if let Some(base_indentation) = base_indentation {
for row in selection_start.row..=selection_end.row {
let selection_row = row - selection_start.row;
let line_start =
normalized_selected_text.point_to_offset(Point::new(selection_row, 0));
let indentation_len = if row == selection_start.row {
base_indentation.len.saturating_sub(selection_start.column)
} else {
let line_len = normalized_selected_text.line_len(selection_row);
cmp::min(line_len, base_indentation.len)
};
let indentation_end = cmp::min(
line_start + indentation_len as usize,
normalized_selected_text.len(),
);
normalized_selected_text.replace(line_start..indentation_end, "");
}
}
let language_name = snapshot
.language_at(selection.start)
.map(|language| language.name());
let language_name = language_name.as_deref().unwrap_or("");
let mut prompt = String::new();
writeln!(prompt, "Given the following {language_name} snippet:").unwrap();
writeln!(prompt, "{normalized_selected_text}").unwrap();
writeln!(prompt, "{user_prompt}.").unwrap();
writeln!(prompt, "Never make remarks, reply only with the new code.").unwrap();
let request = OpenAIRequest {
model: "gpt-4".into(),
messages: vec![RequestMessage {
role: Role::User,
content: prompt,
}],
stream: true,
};
let response = stream_completion(api_key, cx.background().clone(), request);
let editor = editor.downgrade();
self.pending_edits_by_editor.insert(
editor.id(),
cx.spawn(|mut cx| {
async move {
let _clear_highlights = util::defer({
let mut cx = cx.clone();
let editor = editor.clone();
move || {
let _ = editor.update(&mut cx, |editor, cx| {
editor.clear_text_highlights::<Self>(cx);
});
}
});
let mut edit_start = selection.start.to_offset(&snapshot);
let (mut hunks_tx, mut hunks_rx) = mpsc::channel(1);
let diff = cx.background().spawn(async move {
let mut messages = response.await?.ready_chunks(4);
let mut diff = StreamingDiff::new(selected_text.to_string());
let indentation_len;
let indentation_text;
if let Some(base_indentation) = base_indentation {
indentation_len = base_indentation.len;
indentation_text = match base_indentation.kind {
language::IndentKind::Space => " ",
language::IndentKind::Tab => "\t",
};
} else {
indentation_len = 0;
indentation_text = "";
};
let mut new_text =
indentation_text.repeat(
indentation_len.saturating_sub(selection_start.column) as usize,
);
while let Some(messages) = messages.next().await {
for message in messages {
let mut message = message?;
if let Some(choice) = message.choices.pop() {
if let Some(text) = choice.delta.content {
let mut lines = text.split('\n');
if let Some(first_line) = lines.next() {
new_text.push_str(&first_line);
}
for line in lines {
new_text.push('\n');
new_text.push_str(
&indentation_text.repeat(indentation_len as usize),
);
new_text.push_str(line);
}
}
}
}
let hunks = diff.push_new(&new_text);
hunks_tx.send(hunks).await?;
new_text.clear();
}
hunks_tx.send(diff.finish()).await?;
anyhow::Ok(())
});
let mut first_transaction = None;
while let Some(hunks) = hunks_rx.next().await {
editor.update(&mut cx, |editor, cx| {
let mut highlights = Vec::new();
editor.buffer().update(cx, |buffer, cx| {
// Avoid grouping assistant edits with user edits.
buffer.finalize_last_transaction(cx);
buffer.start_transaction(cx);
buffer.edit(
hunks.into_iter().filter_map(|hunk| match hunk {
Hunk::Insert { text } => {
let edit_start = snapshot.anchor_after(edit_start);
Some((edit_start..edit_start, text))
}
Hunk::Remove { len } => {
let edit_end = edit_start + len;
let edit_range = snapshot.anchor_after(edit_start)
..snapshot.anchor_before(edit_end);
edit_start = edit_end;
Some((edit_range, String::new()))
}
Hunk::Keep { len } => {
let edit_end = edit_start + len;
let edit_range = snapshot.anchor_after(edit_start)
..snapshot.anchor_before(edit_end);
edit_start += len;
highlights.push(edit_range);
None
}
}),
None,
cx,
);
if let Some(transaction) = buffer.end_transaction(cx) {
if let Some(first_transaction) = first_transaction {
// Group all assistant edits into the first transaction.
buffer.merge_transactions(
transaction,
first_transaction,
cx,
);
} else {
first_transaction = Some(transaction);
buffer.finalize_last_transaction(cx);
}
}
});
editor.highlight_text::<Self>(
highlights,
gpui::fonts::HighlightStyle {
fade_out: Some(0.6),
..Default::default()
},
cx,
);
})?;
}
diff.await?;
anyhow::Ok(())
}
.log_err()
}),
);
}
}