More specific error for unrecognized subcommands

Dependencies

• [2] EZ7VRNRL Fixing the error message for external commands
• [3] RJMQSZER External commands
• [4] SNZ3OAMC use native external subcommand support instead of hand-rolled one
• [*] SXEYMYF7 Fixing the bad changes in history (unfortunately, by rebooting).

Change contents

• replacement in pijul/src/main.rs at line 200
  [3.1004]→[2.0:205](∅→∅)
  − writeln!(

  − std::io::stderr(),

  − "Error while running {:?}: {}",

  − cmd,

  − std::process::Command::new(&cmd).args(args).exec()

  − )

  − .unwrap_or(());

  − std::process::exit(1)
  [3.1004]

  [3.1063]
  + let err = std::process::Command::new(&cmd).args(args).exec();

  + report_external_command_error(&command[0], err);
• replacement in pijul/src/main.rs at line 213
  [2.340]→[2.340:469](∅→∅)
  − writeln!(std::io::stderr(), "Error while running {:?}: {}", cmd, e).unwrap_or(());

  − std::process::exit(1)
  [2.340]

  [2.469]
  + report_external_command_error(&command[0], e);
• edit in pijul/src/main.rs at line 220
  [6.88358]

  [6.88358]
  + fn report_external_command_error(cmd: &OsString, err: std::io::Error) -> ! {

  + if err.kind() == std::io::ErrorKind::NotFound {

  + writeln!(std::io::stderr(), "No such subcommand: {:?}", cmd).unwrap_or(());

  + } else {

  + writeln!(std::io::stderr(), "Error while running {:?}: {}", cmd, err).unwrap_or(());

  + }

  + std::process::exit(1)

  + }

  +