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use std::path::PathBuf;
use clap::{Parser, Subcommand, ValueEnum};
#[derive(Debug, Clone, Copy, ValueEnum)]
pub enum FormatArg {
Org,
Latex,
Markdown,
Rst,
Plaintext,
}
#[derive(Debug, Clone, Copy, ValueEnum)]
pub enum OutputFormat {
Text,
Json,
Sarif,
}
#[derive(Debug, Parser)]
#[command(name = "snapper", version, about = "Semantic line break formatter")]
pub struct Cli {
#[command(subcommand)]
pub command: Option<Commands>,
/// Input files. Reads stdin if omitted.
#[arg()]
pub files: Vec<PathBuf>,
/// Input format (auto-detected from extension if omitted).
#[arg(short, long)]
pub format: Option<FormatArg>,
/// Assume this filename when reading stdin (for format auto-detection).
#[arg(long)]
pub stdin_filepath: Option<PathBuf>,
/// Output file (stdout if omitted).
#[arg(short, long)]
pub output: Option<PathBuf>,
/// Modify files in place.
#[arg(short, long)]
pub in_place: bool,
/// Maximum line width (0 = unlimited).
#[arg(short = 'w', long, default_value_t = 0)]
pub max_width: usize,
/// Use neural sentence detection (nnsplit LSTM model).
#[arg(long)]
pub neural: bool,
/// Language for neural sentence detection (default: en).
/// Available: en, de, fr, no, sv, zh, tr, ru, uk.
#[arg(long)]
pub lang: Option<String>,
/// Path to custom ONNX model file for neural detection.
#[arg(long)]
pub model_path: Option<PathBuf>,
/// Use pandoc as parser backend (universal format support).
#[arg(long)]
pub use_pandoc: bool,
/// Pandoc AST source when `--use-pandoc` is set:
/// `auto` (prefer in-process FFI, else CLI), `ffi` (`libsnapper_pandoc`),
/// or `cli` (`pandoc` subprocess). Default: `auto`.
/// `ffi` fails explicitly if the library is missing.
#[arg(long, default_value = "auto", value_name = "BACKEND")]
pub pandoc_backend: String,
/// Exit with code 1 if any file would change.
#[arg(long)]
pub check: bool,
/// Show a unified diff of what would change.
#[arg(long)]
pub diff: bool,
/// Path to config file (default: .snapperrc.toml in current or parent dirs).
#[arg(long)]
pub config: Option<PathBuf>,
/// Only format lines in this range (1-indexed, inclusive). Format: START:END.
#[arg(long)]
pub range: Option<String>,
/// Output format for --check mode.
#[arg(long, default_value = "text")]
pub output_format: OutputFormat,
/// Pipe each code block's body through the per-language formatter
/// configured under `[code.<lang>.formatter]` in `.snapperrc.toml`.
/// The formatter runs after the in-block comment reflow. Missing
/// binaries, non-zero exits, and timeouts surface as stderr
/// diagnostics; snapper still exits 0.
#[arg(long, default_value_t = false)]
pub format_code: bool,
}
#[derive(Debug, Subcommand)]
pub enum Commands {
/// Initialize snapper for a project (generate config, pre-commit, gitattributes).
Init {
/// Preview what would be generated without writing files.
#[arg(long)]
dry_run: bool,
},
/// Sentence-level diff between two files.
Sdiff {
/// Original file.
old: PathBuf,
/// Modified file.
new: PathBuf,
/// Input format (auto-detected from extension if omitted).
#[arg(short, long)]
format: Option<FormatArg>,
/// Disable colored output.
#[arg(long)]
no_color: bool,
},
/// Sentence-level diff against a git ref.
GitDiff {
/// Git ref to compare against (default: HEAD).
#[arg(default_value = "HEAD")]
git_ref: String,
/// Files to diff. If omitted, diffs all changed prose files.
#[arg()]
files: Vec<PathBuf>,
/// Input format (auto-detected from extension if omitted).
#[arg(short, long)]
format: Option<FormatArg>,
/// Disable colored output.
#[arg(long)]
no_color: bool,
},
/// Start the LSP server (stdin/stdout).
Lsp,
/// Start the MCP server (stdin/stdout).
Mcp,
/// Watch files and reformat on change.
Watch {
/// Files or glob patterns to watch.
#[arg(required = true)]
patterns: Vec<String>,
/// Input format (auto-detected from extension if omitted).
#[arg(short, long)]
format: Option<FormatArg>,
},
}
/// Parse a range string "START:END" into (start, end) 1-indexed inclusive.
pub fn parse_range(s: &str) -> Option<(usize, usize)> {
let parts: Vec<&str> = s.split(':').collect();
if parts.len() != 2 {
return None;
}
let start = parts[0].parse::<usize>().ok()?;
let end = parts[1].parse::<usize>().ok()?;
if start == 0 || end == 0 || start > end {
return None;
}
Some((start, end))
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn parse_range_valid() {
assert_eq!(parse_range("1:10"), Some((1, 10)));
assert_eq!(parse_range("5:5"), Some((5, 5)));
assert_eq!(parse_range("1:1"), Some((1, 1)));
}
#[test]
fn parse_range_zero_rejected() {
assert_eq!(parse_range("0:5"), None);
assert_eq!(parse_range("5:0"), None);
assert_eq!(parse_range("0:0"), None);
}
#[test]
fn parse_range_reversed_rejected() {
assert_eq!(parse_range("10:5"), None);
}
#[test]
fn parse_range_bad_format() {
assert_eq!(parse_range("abc"), None);
assert_eq!(parse_range("1:2:3"), None);
assert_eq!(parse_range(""), None);
assert_eq!(parse_range("a:b"), None);
assert_eq!(parse_range(":5"), None);
assert_eq!(parse_range("5:"), None);
}
}