rhg: `cat` command: print error messages for missing files
And exit with an error code if no file was matched.
This matches the behavior of Python-based hg.
Differential Revision: https://phab.mercurial-scm.org/D10142
//! A distinction is made between operations and commands.
//! An operation is what can be done whereas a command is what is exposed by
//! the cli. A single command can use several operations to achieve its goal.
mod cat;
mod debugdata;
mod dirstate_status;
mod list_tracked_files;
pub use cat::{cat, CatOutput};
pub use debugdata::{debug_data, DebugDataKind};
pub use list_tracked_files::Dirstate;
pub use list_tracked_files::{list_rev_tracked_files, FilesForRev};