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c5046235b5
New word-wrap function will be implemented in two passes. The first pass splits byte slice to lines, and the second pass inserts "\n" based on that while interleaving push/pop_label() calls and text fragments. Since the second pass combines multiple data sources, byte indices are more convenient than slices there.
47 lines
1.6 KiB
Rust
47 lines
1.6 KiB
Rust
// Copyright 2022-2023 The Jujutsu Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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use std::io;
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use crate::formatter::{FormatRecorder, Formatter};
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pub fn complete_newline(s: impl Into<String>) -> String {
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let mut s = s.into();
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if !s.is_empty() && !s.ends_with('\n') {
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s.push('\n');
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}
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s
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}
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/// Indents each line by the given prefix preserving labels.
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pub fn write_indented(
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formatter: &mut dyn Formatter,
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recorded_content: &FormatRecorder,
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mut write_prefix: impl FnMut(&mut dyn Formatter) -> io::Result<()>,
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) -> io::Result<()> {
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let data = recorded_content.data();
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let mut new_line = true;
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recorded_content.replay_with(formatter, |formatter, range| {
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for line in data[range].split_inclusive(|&c| c == b'\n') {
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if new_line && line != b"\n" {
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// Prefix inherits the current labels. This is implementation detail
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// and may be fixed later.
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write_prefix(formatter)?;
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}
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formatter.write_all(line)?;
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new_line = line.ends_with(b"\n");
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}
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Ok(())
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})
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}
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