cbor-cli 0.7.0

Encode, decode, and inspect CBOR (RFC 8949) from the command line. Convert between CBOR, JSON, YAML, and TOML via serde, with streaming support for CBOR sequences.
Documentation 
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use std::{
  fs::File,
  io::{self, BufReader, Write},
  process,
};

use anyhow::Context;
use cbor_cli::{
  config::{self, Commands},
  export::export_from_reader,
  files::{get_format_by_file_extension, get_missing_files},
  import::import_from_reader,
  inspect::inspect_from_reader,
};

fn files_exist_or_exit(input_paths: &[std::path::PathBuf]) {
  let missing_files = get_missing_files(input_paths);
  if !missing_files.is_empty() {
    for missing_file in missing_files {
      eprintln!("File does not exist: {}", missing_file.display());
    }
    process::exit(1);
  }
}

/// Interpret `\n`, `\t`, `\r`, `\0`, `\\` escape sequences in a delimiter string.
fn unescape_delimiter(s: &str) -> String {
  let mut out = String::with_capacity(s.len());
  let mut chars = s.chars();
  while let Some(c) = chars.next() {
    if c == '\\' {
      match chars.next() {
        Some('n') => out.push('\n'),
        Some('t') => out.push('\t'),
        Some('r') => out.push('\r'),
        Some('0') => out.push('\0'),
        Some(other) => out.push(other),
        None => out.push('\\'),
      }
    } else {
      out.push(c);
    }
  }
  out
}

fn main() -> anyhow::Result<()> {
  let cli = config::get_cli();

  match &cli.command {
    Some(Commands::Inspect { input_paths }) => {
      files_exist_or_exit(input_paths);

      if input_paths.is_empty() {
        let reader = BufReader::new(io::stdin());
        inspect_from_reader(reader, io::stdout())?;
        return Ok(());
      }

      for input_path in input_paths {
        write!(io::stdout(), "{}", input_path.display())?;
        let reader = BufReader::new(File::open(input_path)
          .with_context(|| format!("Failed to open {}", input_path.display()))?);
        inspect_from_reader(reader, io::stdout())
          .with_context(|| format!("Failed to inspect {}", input_path.display()))?;
      }
    }

    Some(Commands::Import { input_paths, format }) => {
      files_exist_or_exit(input_paths);

      if input_paths.is_empty() {
        let input_format = match format {
          Some(format) => format.to_owned(),
          None => {
            eprintln!("Error: No format specified. Use --format to specify the format.");
            process::exit(1);
          }
        };

        let reader = BufReader::new(io::stdin());
        import_from_reader(&input_format, reader, &mut io::stdout())?;
        return Ok(());
      }

      for input_path in input_paths {
        let input_format = match format {
          Some(format) => format.to_owned(),
          None => match get_format_by_file_extension(input_path) {
            Some(format) => format,
            None => {
              eprintln!("Error: Could not determine format from file extension");
              process::exit(1);
            }
          },
        };

        let reader = BufReader::new(File::open(input_path)
          .with_context(|| format!("Failed to open {}", input_path.display()))?);
        import_from_reader(&input_format, reader, &mut io::stdout())
          .with_context(|| format!("Failed to import {}", input_path.display()))?;
      }
    }

    Some(Commands::Export { input_paths, format, pretty }) => {
      files_exist_or_exit(input_paths);

      let delimiter = match &cli.delimiter {
        Some(delimiter) => unescape_delimiter(delimiter),
        None => {
          if format == "yaml" {
            "\n---\n".to_string()
          } else {
            "\n".to_string()
          }
        }
      };

      if cli.verbose > 0 {
        eprintln!("Files to export: {input_paths:?}");
        eprintln!("Exporting to {} format", format);
      }

      if input_paths.is_empty() {
        let reader = BufReader::new(io::stdin());
        export_from_reader(format, &delimiter, *pretty, reader, &mut io::stdout())?;
        return Ok(());
      }

      for (i, input_path) in input_paths.iter().enumerate() {
        if i > 0 {
          io::stdout().write_all(delimiter.as_bytes())?;
        }
        let reader = BufReader::new(File::open(input_path)
          .with_context(|| format!("Failed to open {}", input_path.display()))?);
        export_from_reader(format, &delimiter, *pretty, reader, &mut io::stdout())
          .with_context(|| format!("Failed to export {}", input_path.display()))?;
      }
    }
    None => {}
  }

  Ok(())
}