fall back to site module if pipenv not in PATH (#71)

Signed-off-by: Joel Dice <joel.dice@fermyon.com>

Author: dicej

src/command.rs

@@ -141,7 +141,7 @@ fn find_site_packages() -> Result<Option<PathBuf>> {
             None
         }
     } else {
-        match process::Command::new("pipenv").arg("--venv").output() {
+        let pipenv_packages = match process::Command::new("pipenv").arg("--venv").output() {
             Ok(output) => {
                 if output.status.success() {
                     let dir = Path::new(str::from_utf8(&output.stdout)?.trim()).join("lib");
@@ -157,24 +157,29 @@ fn find_site_packages() -> Result<Option<PathBuf>> {
                     }
                 } else {
                     // `pipenv` is in `$PATH`, but this app does not appear to be using it
-                    // Get site packages location using the `site` module in python
-                    match process::Command::new("python3")
-                        .args(["-c", "import site; print(site.getsitepackages()[0])"])
-                        .output()
-                    {
-                        Ok(output) => {
-                            let path =
-                                Path::new(str::from_utf8(&output.stdout)?.trim()).to_path_buf();
-                            Some(path)
-                        }
-                        Err(_) => None,
-                    }
+                    None
                 }
             }
             Err(_) => {
                 // `pipenv` is not in `$PATH -- assume this app isn't using it
                 None
             }
+        };
+
+        if pipenv_packages.is_some() {
+            pipenv_packages
+        } else {
+            // Get site packages location using the `site` module in python
+            match process::Command::new("python3")
+                .args(["-c", "import site; print(site.getsitepackages()[0])"])
+                .output()
+            {
+                Ok(output) => {
+                    let path = Path::new(str::from_utf8(&output.stdout)?.trim()).to_path_buf();
+                    Some(path)
+                }
+                Err(_) => None,
+            }
         }
     })
 }