Added check for grype binary and optional installation prompt, per up…

…stream issue popey#3.

grummage

@@ -1,5 +1,6 @@
 #!/usr/bin/env python
 import json
+import os
 import subprocess
 import sys
 import tempfile
@@ -8,6 +9,34 @@ from textual.app import App
 from textual.containers import Container, Horizontal, VerticalScroll
 from textual.widgets import Tree, Footer, Static
 
+def is_grype_installed():
+    """Check if the grype binary is available in the system's PATH."""
+    return any(
+        os.path.isfile(os.path.join(path, "grype"))
+        and os.access(os.path.join(path, "grype"), os.X_OK)
+        for path in os.environ["PATH"].split(os.pathsep)
+    )
+
+def prompt_install_grype():
+    """Prompt the user to install grype if it's not installed."""
+    response = input(
+        "The grype binary is not located in $PATH. Would you like to install it now? [y/N]: "
+    ).strip().lower()
+    return response == "y"
+
+def install_grype():
+    """Run the one-liner command to install grype."""
+    try:
+        # Use shell=True to execute the one-liner properly
+        subprocess.run(
+            "curl -sSfL https://raw.githubusercontent.com/anchore/grype/main/install.sh | sh -s -- -b /usr/local/bin",
+            shell=True,
+            check=True,
+        )
+        print("Grype successfully installed.")
+    except subprocess.CalledProcessError as e:
+        print(f"Failed to install grype: {e}")
+        sys.exit(1)
 
 class Grummage(App):
     BINDINGS = [
@@ -335,4 +364,12 @@ class Grummage(App):
 
 if __name__ == "__main__":
     sbom_file = sys.argv[1] if len(sys.argv) > 1 else sys.exit()
+    if not is_grype_installed():
+        if prompt_install_grype():
+            install_grype()
+        else:
+            print(
+                "The grype binary is not located in $PATH and the option to install was deferred."
+            )
+            sys.exit(0)
     Grummage(sbom_file).run()