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Simplify implementation of add_indent_level.

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Increase hybrid indent heuristic attempt limit to 4.
Clarify the fallback logic in indent heuristic docs.
This commit is contained in:
Daniel Ebert 2023-10-15 11:43:28 +02:00 committed by Blaž Hrastnik
parent 3e79a35656
commit 723a132bdf
2 changed files with 20 additions and 23 deletions
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2
book/src/configuration.md
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@ -65,7 +65,7 @@ Its settings will be merged with the configuration directory `config.toml` and t
| `workspace-lsp-roots` | Directories relative to the workspace root that are treated as LSP roots. Should only be set in `.helix/config.toml` | `[]` |
| `default-line-ending` | The line ending to use for new documents. Can be `native`, `lf`, `crlf`, `ff`, `cr` or `nel`. `native` uses the platform's native line ending (`crlf` on Windows, otherwise `lf`). | `native` |
| `insert-final-newline` | Whether to automatically insert a trailing line-ending on write if missing | `true` |
| `indent-heuristic` | How the indentation for a newly inserted line is computed: `simple` just copies the indentation level from the previous line, `tree-sitter` computes the indentation based on the syntax tree and `hybrid` combines both approaches | `hybrid`
| `indent-heuristic` | How the indentation for a newly inserted line is computed: `simple` just copies the indentation level from the previous line, `tree-sitter` computes the indentation based on the syntax tree and `hybrid` combines both approaches. If the chosen heuristic is not available, a different one will be used as a fallback (the fallback order being `hybrid` -> `tree-sitter` -> `simple`). | `hybrid`
### `[editor.statusline]` Section

41
helix-core/src/indent.rs
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@ -8,7 +8,7 @@ use crate::{
graphemes::{grapheme_width, tab_width_at},
syntax::{IndentationHeuristic, LanguageConfiguration, RopeProvider, Syntax},
tree_sitter::Node,
Rope, RopeGraphemes, RopeSlice,
Position, Rope, RopeGraphemes, RopeSlice,
};
/// Enum representing indentation style.
@ -225,27 +225,24 @@ fn add_indent_level(
// Since the width of a tab depends on its offset, we cannot simply iterate over
// the chars of `base_indent` in reverse until we have the desired indent reduction,
// instead we iterate over them twice in forward direction.
let mut base_indent_width: usize = 0;
for c in base_indent.chars() {
base_indent_width += match c {
'\t' => tab_width_at(base_indent_width, tab_width as u16),
// This is only true since `base_indent` consists only of tabs and spaces
_ => 1,
};
}
let base_indent_rope = RopeSlice::from(base_indent.as_str());
#[allow(deprecated)]
let base_indent_width =
crate::visual_coords_at_pos(base_indent_rope, base_indent_rope.len_chars(), tab_width)
.col;
let target_indent_width = base_indent_width
.saturating_sub((-added_indent_level) as usize * indent_style.indent_width(tab_width));
let mut reduced_indent_width = 0;
for (i, c) in base_indent.char_indices() {
if reduced_indent_width >= target_indent_width {
base_indent.truncate(i);
return base_indent;
}
reduced_indent_width += match c {
'\t' => tab_width_at(base_indent_width, tab_width as u16),
_ => 1,
};
}
#[allow(deprecated)]
let char_end_idx = crate::pos_at_visual_coords(
base_indent_rope,
Position {
row: 0,
col: target_indent_width,
},
tab_width,
);
let byte_end_idx = base_indent_rope.char_to_byte(char_end_idx);
base_indent.truncate(byte_end_idx);
base_indent
}
}
@ -959,7 +956,7 @@ pub fn indent_for_newline(
line_before_end_pos,
true,
) {
if let IndentationHeuristic::Hybrid = indent_heuristic {
if *indent_heuristic == IndentationHeuristic::Hybrid {
// We want to compute the indentation not only based on the
// syntax tree but also on the actual indentation of a previous
// line. This makes indentation computation more resilient to
@ -969,7 +966,7 @@ pub fn indent_for_newline(
// make sense, e.g. if it has a different alignment than the new line.
// In order to prevent edge cases with long running times, we only try
// a constant number of (non-empty) lines.
const MAX_ATTEMPTS: usize = 2;
const MAX_ATTEMPTS: usize = 4;
let mut num_attempts = 0;
for line_idx in (0..=line_before).rev() {
let line = text.line(line_idx);