patchloom 0.9.0

Structured file editing library and CLI for AI agents: parser-backed JSON/YAML/TOML edits, AST-aware code operations, multi-file batching, markdown operations, and MCP server
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//! File read operation (with optional line range) for the library API.

use std::path::Path;

use anyhow::Context;

/// Read a file's content, optionally restricted to a line range.
///
/// Line numbers are 1-based inclusive. This is a read-only operation.
pub fn read(
    path: &Path,
    start_line: Option<usize>,
    end_line: Option<usize>,
) -> anyhow::Result<String> {
    let content = std::fs::read_to_string(path)
        .with_context(|| format!("failed to read {}", path.display()))?;

    match (start_line, end_line) {
        (None, None) => Ok(content),
        (start, end) => {
            let start = start.unwrap_or(1).saturating_sub(1); // convert to 0-based
            let lines: Vec<&str> = content.lines().collect();
            let end = end.unwrap_or(lines.len()).min(lines.len());
            if start >= lines.len() {
                return Ok(String::new());
            }
            let selected: Vec<&str> = lines[start..end].to_vec();
            let mut result = selected.join("\n");
            if !result.is_empty() {
                result.push('\n');
            }
            Ok(result)
        }
    }
}