fix: handle package version panic (#57)

src/modules/go.rs

@@ -1,5 +1,4 @@
 use ansi_term::Color;
-use std::path::PathBuf;
 use std::process::Command;
 
 use super::{Context, Module};
@@ -53,7 +52,7 @@ fn get_go_version() -> Option<String> {
 }
 
 fn format_go_version(go_stdout: String) -> Option<String> {
-    let mut version = go_stdout
+    let version = go_stdout
         // split into ["", "1.12.4 linux/amd64"]
         .splitn(2, "go version go")
         // return "1.12.4 linux/amd64"

src/modules/package.rs

@@ -49,51 +49,42 @@ fn read_file(file_name: &str) -> io::Result<String> {
     Ok(data)
 }
 
-fn extract_cargo_version(file_contents: String) -> Option<String> {
+fn extract_cargo_version(file_contents: &str) -> Option<String> {
     let cargo_toml = file_contents.parse::<toml::Value>().ok()?;
+    let raw_version = cargo_toml.get("package")?.get("version")?.as_str()?;
 
-    match cargo_toml["package"]["version"].as_str() {
-        Some(raw_version) => {
-            let version = format_version(raw_version.to_string());
-            Some(version)
-        }
-        None => None,
-    }
+    let formatted_version = format_version(raw_version);
+    Some(formatted_version)
 }
 
-fn extract_package_version(file_contents: String) -> Option<String> {
-    let json: Option<serde_json::Value> = serde_json::from_str(&file_contents).ok()?;
+fn extract_package_version(file_contents: &str) -> Option<String> {
+    let package_json: serde_json::Value = serde_json::from_str(&file_contents).ok()?;
+    let raw_version = package_json.get("version")?.as_str()?;
+    if raw_version == "null" {
+        return None;
+    };
 
-    match json {
-        Some(json) => {
-            let raw_version = json["version"].to_string();
-            if raw_version == "null" {
-                None
-            } else {
-                Some(format_version(raw_version))
-            }
-        }
-        None => None,
-    }
+    let formatted_version = format_version(raw_version);
+    Some(formatted_version)
 }
 
 fn get_package_version(context: &Context) -> Option<String> {
     let has_cargo_toml = context.dir_files.iter().any(is_cargo_toml);
     if has_cargo_toml {
         let file_contents = read_file("Cargo.toml").ok()?;
-        return extract_cargo_version(file_contents);
+        return extract_cargo_version(&file_contents);
     }
 
     let has_package_json = context.dir_files.iter().any(is_package_json);
     if has_package_json {
         let file_contents = read_file("package.json").ok()?;
-        return extract_package_version(file_contents);
+        return extract_package_version(&file_contents);
     }
 
     None
 }
 
-fn format_version(version: String) -> String {
+fn format_version(version: &str) -> String {
     format!("v{}", version.replace('"', "").trim())
 }
 
@@ -103,7 +94,51 @@ mod tests {
 
     #[test]
     fn test_format_version() {
-        let input = String::from("0.1.0");
-        assert_eq!(format_version(input), "v0.1.0");
+        assert_eq!(format_version("0.1.0"), "v0.1.0");
+    }
+
+    #[test]
+    fn test_extract_cargo_version() {
+        let cargo_with_version = "[package]
+            name = \"starship\"
+            version = \"0.1.0\"";
+
+        let expected_version = Some("v0.1.0".to_string());
+        assert_eq!(extract_cargo_version(&cargo_with_version), expected_version);
+
+        let cargo_without_version = "[package]
+            name = \"starship\"";
+
+        let expected_version = None;
+        assert_eq!(
+            extract_cargo_version(&cargo_without_version),
+            expected_version
+        );
+    }
+
+    #[test]
+    fn test_extract_package_version() {
+        let package_with_version = serde_json::json!({
+            "name": "spacefish",
+            "version": "0.1.0"
+        })
+        .to_string();
+
+        let expected_version = Some("v0.1.0".to_string());
+        assert_eq!(
+            extract_package_version(&package_with_version),
+            expected_version
+        );
+
+        let package_without_version = serde_json::json!({
+            "name": "spacefish"
+        })
+        .to_string();
+
+        let expected_version = None;
+        assert_eq!(
+            extract_package_version(&package_without_version),
+            expected_version
+        );
     }
 }