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|
use std::{
error::Error,
io::{Read, Write},
process::{Command, Stdio},
sync::Arc,
};
use dot::Id;
use ide_db::{
base_db::{CrateGraph, CrateId, Dependency, SourceDatabase},
RootDatabase,
};
// Feature: View Crate Graph
//
// Renders the currently loaded crate graph as an SVG graphic. Requires the `dot` tool to be
// installed.
//
// |===
// | Editor | Action Name
//
// | VS Code | **Rust Analyzer: View Crate Graph**
// |===
pub(crate) fn view_crate_graph(db: &RootDatabase) -> Result<String, String> {
let mut dot = Vec::new();
let graph = DotCrateGraph(db.crate_graph());
dot::render(&graph, &mut dot).unwrap();
render_svg(&dot).map_err(|e| e.to_string())
}
fn render_svg(dot: &[u8]) -> Result<String, Box<dyn Error>> {
// We shell out to `dot` to render to SVG, as there does not seem to be a pure-Rust renderer.
let child = Command::new("dot")
.arg("-Tsvg")
.stdin(Stdio::piped())
.stdout(Stdio::piped())
.spawn()
.map_err(|err| format!("failed to spawn `dot -Tsvg`: {}", err))?;
child.stdin.unwrap().write_all(&dot)?;
let mut svg = String::new();
child.stdout.unwrap().read_to_string(&mut svg)?;
Ok(svg)
}
struct DotCrateGraph(Arc<CrateGraph>);
type Edge<'a> = (CrateId, &'a Dependency);
impl<'a> dot::GraphWalk<'a, CrateId, Edge<'a>> for DotCrateGraph {
fn nodes(&'a self) -> dot::Nodes<'a, CrateId> {
self.0.iter().collect()
}
fn edges(&'a self) -> dot::Edges<'a, Edge<'a>> {
self.0
.iter()
.flat_map(|krate| self.0[krate].dependencies.iter().map(move |dep| (krate, dep)))
.collect()
}
fn source(&'a self, edge: &Edge<'a>) -> CrateId {
edge.0
}
fn target(&'a self, edge: &Edge<'a>) -> CrateId {
edge.1.crate_id
}
}
impl<'a> dot::Labeller<'a, CrateId, Edge<'a>> for DotCrateGraph {
fn graph_id(&'a self) -> Id<'a> {
Id::new("rust_analyzer_crate_graph").unwrap()
}
fn node_id(&'a self, n: &CrateId) -> Id<'a> {
let name = self.0[*n].display_name.as_ref().map_or("_missing_name_", |name| &*name);
Id::new(format!("{}_{}", name, n.0)).unwrap()
}
}
|
