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

rust-index: using the `hg::index::Index` in ancestors iterator and lazy set...

rust-index: using the `hg::index::Index` in ancestors iterator and lazy set Since there is no Rust implementation for REVLOGV2/CHANGELOGv2, we declare them to be incompatible with Rust, hence indexes in these formats will use the implementations from Python `mercurial.ancestor`. If this is an unacceptable performance hit for current users of these formats, we can later on add Rust implementations based on the C index for them or implement these formats for the Rust indexes. Among the challenges that we had to meet, we wanted to avoid taking the GIL each time the inner (vcsgraph) iterator has to call the parents function. This would probably still be acceptable in terms of performance with `AncestorsIterator`, but not with `LazyAncestors` nor for the upcoming change in `MissingAncestors`. Hence we enclose the reference to the index in a `PySharedRef`, leading to more rigourous checking of mutations, which does pass now that there no logically immutable methods of `hg::index::Index` that take a mutable reference as input.

Raphaël Gomès - - Load All Authors

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             config.rs
        
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             | 1.0 KiB
            
                | application/rls-services+xml
            
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             / rust / rhg / src / commands / config.rs
          
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      use crate::error::CommandError;

      use clap::Arg;

      use format_bytes::format_bytes;

      use hg::errors::HgError;

      use hg::utils::SliceExt;

      pub const HELP_TEXT: &str = "

      With one argument of the form section.name, print just the value of that config item.

      ";

      pub fn args() -> clap::Command {

          clap::command!("config")

              .arg(

                  Arg::new("name")

                      .help("the section.name to print")

                      .value_name("NAME")

                      .required(true),

              )

              .about(HELP_TEXT)

      }

      pub fn run(invocation: &crate::CliInvocation) -> Result<(), CommandError> {

          let (section, name) = invocation

              .subcommand_args

              .get_one::<String>("name")

              .expect("missing required CLI argument")

              .as_bytes()

              .split_2(b'.')

              .ok_or_else(|| HgError::unsupported("hg config <section>"))?;

          if let Some(value) = invocation.config.get(section, name) {

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

              Ok(())

          } else {

              Err(CommandError::Unsuccessful)

          }

      }

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				use crate::error::CommandError;
				use clap::Arg;
				use format_bytes::format_bytes;
				use hg::errors::HgError;
				use hg::utils::SliceExt;

				pub const HELP_TEXT: &str = "
				With one argument of the form section.name, print just the value of that config item.
				";

				pub fn args() -> clap::Command {
				clap::command!("config")
				.arg(
				Arg::new("name")
				.help("the section.name to print")
				.value_name("NAME")
				.required(true),
				)
				.about(HELP_TEXT)
				}

				pub fn run(invocation: &crate::CliInvocation) -> Result<(), CommandError> {
				let (section, name) = invocation
				.subcommand_args
				.get_one::<String>("name")
				.expect("missing required CLI argument")
				.as_bytes()
				.split_2(b'.')
				.ok_or_else(\|\| HgError::unsupported("hg config <section>"))?;

				if let Some(value) = invocation.config.get(section, name) {
				invocation.ui.write_stdout(&format_bytes!(b"{}\n", value))?;
				Ok(())
				} else {
				Err(CommandError::Unsuccessful)
				}
				}