#
cargo/ops/tree/format/
mod.rs

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    use std::fmt;

    use anyhow::{bail, Error};

    use self::parse::{Parser, RawChunk};
    use super::{Graph, Node};

    mod parse;

    enum Chunk {
        Raw(String),
        Package,
        License,
        Repository,
        Features,
        LibName,
    }

    pub struct Pattern(Vec<Chunk>);

    impl Pattern {
        pub fn new(format: &str) -> Result<Pattern, Error> {
            let mut chunks = vec![];

            for raw in Parser::new(format) {
                let chunk = match raw {
                    RawChunk::Text(text) => Chunk::Raw(text.to_owned()),
                    RawChunk::Argument("p") => Chunk::Package,
                    RawChunk::Argument("l") => Chunk::License,
                    RawChunk::Argument("r") => Chunk::Repository,
                    RawChunk::Argument("f") => Chunk::Features,
                    RawChunk::Argument("lib") => Chunk::LibName,
                    RawChunk::Argument(a) => {
                        bail!("unsupported pattern `{}`", a);
                    }
                    RawChunk::Error(err) => bail!("{}", err),
                };
                chunks.push(chunk);
            }

            Ok(Pattern(chunks))
        }

        pub fn display<'a>(&'a self, graph: &'a Graph<'a>, node_index: usize) -> Display<'a> {
            Display {
                pattern: self,
                graph,
                node_index,
            }
        }
    }

    pub struct Display<'a> {
        pattern: &'a Pattern,
        graph: &'a Graph<'a>,
        node_index: usize,
    }

    impl<'a> fmt::Display for Display<'a> {
        fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
            let node = self.graph.node(self.node_index);
            match node {
                Node::Package {
                    package_id,
                    features,
                    ..
                } => {
                    let package = self.graph.package_for_id(*package_id);
                    for chunk in &self.pattern.0 {
                        match chunk {
                            Chunk::Raw(s) => fmt.write_str(s)?,
                            Chunk::Package => {
                                let proc_macro_suffix = if package.proc_macro() {
                                    " (proc-macro)"
                                } else {
                                    ""
                                };
                                write!(
                                    fmt,
                                    "{} v{}{}",
                                    package.name(),
                                    package.version(),
                                    proc_macro_suffix
                                )?;

                                let source_id = package.package_id().source_id();
                                if !source_id.is_crates_io() {
                                    write!(fmt, " ({})", source_id)?;
                                }
                            }
                            Chunk::License => {
                                if let Some(license) = &package.manifest().metadata().license {
                                    write!(fmt, "{}", license)?;
                                }
                            }
                            Chunk::Repository => {
                                if let Some(repository) = &package.manifest().metadata().repository {
                                    write!(fmt, "{}", repository)?;
                                }
                            }
                            Chunk::Features => {
                                write!(fmt, "{}", features.join(","))?;
                            }
                            Chunk::LibName => {
                                if let Some(target) = package
                                    .manifest()
                                    .targets()
                                    .iter()
                                    .find(|target| target.is_lib())
                                {
                                    write!(fmt, "{}", target.crate_name())?;
                                }
                            }
                        }
                    }
                }
                Node::Feature { name, node_index } => {
                    let for_node = self.graph.node(*node_index);
                    match for_node {
                        Node::Package { package_id, .. } => {
                            write!(fmt, "{} feature \"{}\"", package_id.name(), name)?;
                            if self.graph.is_cli_feature(self.node_index) {
                                write!(fmt, " (command-line)")?;
                            }
                        }
                        // The node_index in Node::Feature must point to a package
                        // node, see `add_feature`.
                        _ => panic!("unexpected feature node {:?}", for_node),
                    }
                }
            }

            Ok(())
        }
    }