upstream/mercurial-mirror Files · rust/rhg/src/commands/root.rs

rust: replace most "operation" structs with functions...

rust: replace most "operation" structs with functions The hg-core crate has a partially-formed concept of "operation", represented as structs with constructors and a `run` method. Each struct’s contructor takes different parameters, and each `run` has a different return type. Constructors typically don’t do much more than store parameters for `run` to access them. There was a comment about adding an `Operation` trait when the language supports expressing something so general, but it’s hard to imagine how operations with such different APIs could be used in a generic context. This commit starts removing the concept of "operation", since those are pretty much just functions. Differential Revision: https://phab.mercurial-scm.org/D9595

Simon Sapin - - Load All Authors

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             root.rs
        
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                | application/rls-services+xml
            
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             / rust / rhg / src / commands / root.rs
          
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      use crate::commands::Command;

      use crate::error::CommandError;

      use crate::ui::Ui;

      use format_bytes::format_bytes;

      use hg::operations::find_root;

      use hg::utils::files::get_bytes_from_path;

      pub const HELP_TEXT: &str = "

      Print the root directory of the current repository.

      Returns 0 on success.

      ";

      pub struct RootCommand {}

      impl RootCommand {

          pub fn new() -> Self {

              RootCommand {}

          }

      }

      impl Command for RootCommand {

          fn run(&self, ui: &Ui) -> Result<(), CommandError> {

              let path_buf = find_root()?;

              let bytes = get_bytes_from_path(path_buf);

              ui.write_stdout(&format_bytes!(b"{}\n", bytes.as_slice()))?;

              Ok(())

          }

      }

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				use crate::commands::Command;
				use crate::error::CommandError;
				use crate::ui::Ui;
				use format_bytes::format_bytes;
				use hg::operations::find_root;
				use hg::utils::files::get_bytes_from_path;

				pub const HELP_TEXT: &str = "
				Print the root directory of the current repository.

				Returns 0 on success.
				";

				pub struct RootCommand {}

				impl RootCommand {
				pub fn new() -> Self {
				RootCommand {}
				}
				}

				impl Command for RootCommand {
				fn run(&self, ui: &Ui) -> Result<(), CommandError> {
				let path_buf = find_root()?;

				let bytes = get_bytes_from_path(path_buf);

				ui.write_stdout(&format_bytes!(b"{}\n", bytes.as_slice()))?;

				Ok(())
				}
				}