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Apply snippets as transactions
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parent
3f90dafa3c
commit
b9b1ec2208
1
Cargo.lock
generated
1
Cargo.lock
generated
@ -1139,6 +1139,7 @@ dependencies = [
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"futures-util",
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"helix-core",
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"helix-loader",
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"helix-parsec",
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"log",
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"lsp-types",
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"serde",
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@ -1,3 +1,5 @@
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use std::borrow::Cow;
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use anyhow::{anyhow, Result};
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use crate::{util::lsp_pos_to_pos, OffsetEncoding};
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@ -54,6 +56,112 @@ pub fn parse(s: &str) -> Result<Snippet<'_>> {
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parser::parse(s).map_err(|rest| anyhow!("Failed to parse snippet. Remaining input: {}", rest))
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}
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pub fn into_transaction<'a>(
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snippet: Snippet<'a>,
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doc: &helix_core::Rope,
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selection: &helix_core::Selection,
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edit: &lsp_types::TextEdit,
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line_ending: &str,
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offset_encoding: OffsetEncoding,
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) -> helix_core::Transaction {
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use helix_core::{smallvec, Range, Selection, Transaction};
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use SnippetElement::*;
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let text = doc.slice(..);
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let primary_cursor = selection.primary().cursor(text);
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let start_offset = match lsp_pos_to_pos(doc, edit.range.start, offset_encoding) {
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Some(start) => start as i128 - primary_cursor as i128,
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None => return Transaction::new(doc),
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};
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let end_offset = match lsp_pos_to_pos(doc, edit.range.end, offset_encoding) {
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Some(end) => end as i128 - primary_cursor as i128,
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None => return Transaction::new(doc),
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};
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let newline_with_offset = format!(
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"{line_ending}{blank:width$}",
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width = edit.range.start.character as usize,
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blank = ""
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);
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let mut insert = String::new();
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let mut offset = (primary_cursor as i128 + start_offset) as usize;
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let mut tabstops: Vec<Range> = Vec::new();
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for element in snippet.elements {
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match element {
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Text(text) => {
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// small optimization to avoid calling replace when it's unnecessary
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let text = if text.contains('\n') {
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Cow::Owned(text.replace('\n', &newline_with_offset))
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} else {
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Cow::Borrowed(text)
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};
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offset += text.chars().count();
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insert.push_str(&text);
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}
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Variable {
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name: _name,
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regex: None,
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r#default,
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} => {
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// TODO: variables. For now, fall back to the default, which defaults to "".
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let text = r#default.unwrap_or_default();
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offset += text.chars().count();
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insert.push_str(text);
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}
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Tabstop { .. } => {
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// TODO: tabstop indexing: 0 is final cursor position. 1,2,.. are positions.
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// TODO: merge tabstops with the same index
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tabstops.push(Range::point(offset));
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}
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Placeholder {
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tabstop: _tabstop,
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value,
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} => match value.as_ref() {
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// https://doc.rust-lang.org/beta/unstable-book/language-features/box-patterns.html
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// would make this a bit nicer
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Text(text) => {
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let len_chars = text.chars().count();
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tabstops.push(Range::new(offset, offset + len_chars + 1));
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offset += len_chars;
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insert.push_str(text);
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}
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other => {
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log::error!(
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"Discarding snippet: generating a transaction for placeholder contents {:?} is unimplemented.",
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other
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);
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return Transaction::new(doc);
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}
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},
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other => {
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log::error!(
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"Discarding snippet: generating a transaction for {:?} is unimplemented.",
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other
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);
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return Transaction::new(doc);
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}
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}
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}
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let transaction = Transaction::change_by_selection(doc, selection, |range| {
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let cursor = range.cursor(text);
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(
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(cursor as i128 + start_offset) as usize,
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(cursor as i128 + end_offset) as usize,
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Some(insert.clone().into()),
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)
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});
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if let Some(first) = tabstops.first() {
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transaction.with_selection(Selection::new(smallvec![*first], 0))
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} else {
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transaction
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}
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}
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mod parser {
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use helix_parsec::*;
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@ -119,7 +119,9 @@ fn item_to_transaction(
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start_offset: usize,
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trigger_offset: usize,
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) -> Transaction {
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let transaction = if let Some(edit) = &item.text_edit {
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use helix_lsp::snippet;
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if let Some(edit) = &item.text_edit {
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let edit = match edit {
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lsp::CompletionTextEdit::Edit(edit) => edit.clone(),
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lsp::CompletionTextEdit::InsertAndReplace(item) => {
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@ -128,12 +130,38 @@ fn item_to_transaction(
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}
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};
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util::generate_transaction_from_completion_edit(
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doc.text(),
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doc.selection(view_id),
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edit,
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offset_encoding, // TODO: should probably transcode in Client
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)
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if matches!(item.kind, Some(lsp::CompletionItemKind::SNIPPET))
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|| matches!(
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item.insert_text_format,
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Some(lsp::InsertTextFormat::SNIPPET)
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)
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{
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match snippet::parse(&edit.new_text) {
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Ok(snippet) => snippet::into_transaction(
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snippet,
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doc.text(),
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doc.selection(view_id),
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&edit,
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doc.line_ending.as_str(),
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offset_encoding,
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),
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Err(err) => {
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log::error!(
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"Failed to parse snippet: {:?}, remaining output: {}",
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&edit.new_text,
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err
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);
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Transaction::new(doc.text())
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}
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}
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} else {
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util::generate_transaction_from_completion_edit(
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doc.text(),
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doc.selection(view_id),
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edit,
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offset_encoding, // TODO: should probably transcode in Client
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)
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}
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} else {
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let text = item.insert_text.as_ref().unwrap_or(&item.label);
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// Some LSPs just give you an insertText with no offset ¯\_(ツ)_/¯
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@ -157,9 +185,7 @@ fn item_to_transaction(
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(cursor, cursor, Some(text.into()))
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})
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};
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transaction
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}
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}
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fn completion_changes(transaction: &Transaction, trigger_offset: usize) -> Vec<Change> {
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