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rust: add `Progress` trait for progress bars...

rust: add `Progress` trait for progress bars This will be used in the next few changes to introduce a progress bar for the `hg update` fastpath.

Raphaël Gomès - - Load All Authors

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             progress.rs
        
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                | application/rls-services+xml
            
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             / rust / hg-core / src / progress.rs
          
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      //! Progress-bar related things

      /// A generic determinate progress bar trait

      pub trait Progress: Send + Sync + 'static {

          /// Set the current position and optionally the total

          fn update(&self, pos: u64, total: Option<u64>);

          /// Increment the current position and optionally the total

          fn increment(&self, step: u64, total: Option<u64>);

          /// Declare that progress is over and the progress bar should be deleted

          fn complete(self);

      }

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				//! Progress-bar related things

				/// A generic determinate progress bar trait
				pub trait Progress: Send + Sync + 'static {
				/// Set the current position and optionally the total
				fn update(&self, pos: u64, total: Option<u64>);
				/// Increment the current position and optionally the total
				fn increment(&self, step: u64, total: Option<u64>);
				/// Declare that progress is over and the progress bar should be deleted
				fn complete(self);
				}