automatically find coverage file

Cargo.lock

@@ -1526,6 +1526,7 @@ dependencies = [
  "tokio-stream",
  "toml",
  "url",
+ "walkdir",
 ]
 
 [[package]]
@@ -2572,9 +2573,9 @@ checksum = "49874b5167b65d7193b8aba1567f5c7d93d001cafc34600cee003eda787e483f"
 
 [[package]]
 name = "walkdir"
-version = "2.4.0"
+version = "2.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d71d857dc86794ca4c280d616f7da00d2dbfd8cd788846559a6813e6aa4b54ee"
+checksum = "29790946404f91d9c5d06f9874efddea1dc06c5efe94541a7d6863108e3a5e4b"
 dependencies = [
  "same-file",
  "winapi-util",

helix-view/Cargo.toml

@@ -51,6 +51,7 @@ log = "~0.4"
 
 parking_lot = "0.12.2"
 quick-xml = { version = "0.31.0", features = ["serialize"] }
+walkdir = "2.5.0"
 
 
 [target.'cfg(windows)'.dependencies]

helix-view/src/coverage.rs

@@ -4,6 +4,7 @@ use std::collections::HashMap;
 use std::fs::File;
 use std::io::BufReader;
 use std::time::SystemTime;
+use walkdir;
 
 #[derive(Debug)]
 pub struct Coverage {
@@ -81,9 +82,9 @@ struct Line {
 /// function will return None if the coverage file is not found, invalid, does
 /// not contain the document, or if it is out of date compared to the document.
 pub fn get_coverage(document_path: &std::path::PathBuf) -> Option<FileCoverage> {
-    let coverage_path = std::env::var("HELIX_COVERAGE_FILE").ok()?;
-    log::debug!("coverage file is {}", coverage_path);
-    let coverage = read_cobertura_coverage(&std::path::PathBuf::from(coverage_path))?;
+    let coverage_path = find_coverage_file()?;
+    log::debug!("coverage file is {:?}", coverage_path);
+    let coverage = read_cobertura_coverage(&coverage_path)?;
     log::debug!("coverage is valid");
 
     log::debug!("document path: {:?}", document_path);
@@ -106,6 +107,21 @@ pub fn get_coverage(document_path: &std::path::PathBuf) -> Option<FileCoverage>
     }
 }
 
+fn find_coverage_file() -> Option<std::path::PathBuf> {
+    if let Some(coverage_path) = std::env::var("HELIX_COVERAGE_FILE").ok() {
+        return Some(std::path::PathBuf::from(coverage_path));
+    }
+    for entry in walkdir::WalkDir::new(".")
+        .into_iter()
+        .filter_map(|e| e.ok())
+    {
+        if entry.file_name() == "coverage.xml" || entry.file_name() == "cobertura.xml" {
+            return Some(entry.path().to_path_buf());
+        }
+    }
+    return None;
+}
+
 fn read_cobertura_coverage(path: &std::path::PathBuf) -> Option<Coverage> {
     let file = File::open(path).ok()?;
     let metadata = file.metadata().ok()?;