Change executable_name to hold the full command string

Previously, executable_name held just the binary name and the error
message hardcoded " generate" as the subcommand:

  format!("CODEOWNERS out of date. Run `{} generate` ...", executable_name)

This made it impossible for wrappers (like the code_ownership Ruby gem)
to show the correct command in the error message, since their update
command is not "<binary> generate".

Now executable_name holds the full command to run. The format string
no longer appends " generate". The default changes from "codeowners"
to "codeowners generate" so existing behavior is preserved for users
who do not customize the field.

Users with a custom executable_name in config/code_ownership.yml will
need to append their subcommand — e.g. change:
  executable_name: my-tool
to:
  executable_name: my-tool generate

Author: dduugg

src/config.rs

@@ -68,7 +68,7 @@ fn vendored_gems_path() -> String {
 }
 
 fn default_executable_name() -> String {
-    "codeowners".to_string()
+    "codeowners generate".to_string()
 }
 
 fn default_ignore_dirs() -> Vec<String> {
@@ -134,7 +134,7 @@ mod tests {
             vec!["frontend/**/node_modules/**/*", "frontend/**/__generated__/**/*"]
         );
         assert_eq!(config.vendored_gems_path, "vendored/");
-        assert_eq!(config.executable_name, "codeowners");
+        assert_eq!(config.executable_name, "codeowners generate");
         Ok(())
     }
 
@@ -167,7 +167,7 @@ mod tests {
         fs::write(&config_path, config_str)?;
         let config_file = File::open(&config_path)?;
         let config: Config = serde_yaml::from_reader(config_file)?;
-        assert_eq!(config.executable_name, "codeowners");
+        assert_eq!(config.executable_name, "codeowners generate");
         Ok(())
     }
 

src/ownership/validator.rs

@@ -169,7 +169,7 @@ impl Error {
                 Error::FileWithoutOwner { path: _ } => "Some files are missing ownership".to_owned(),
                 Error::FileWithMultipleOwners { path: _, owners: _ } => "Code ownership should only be defined for each file in one way. The following files have declared ownership in multiple ways".to_owned(),
                 Error::CodeownershipFileIsStale { executable_name } => {
-                    format!("CODEOWNERS out of date. Run `{} generate` to update the CODEOWNERS file", executable_name)
+                    format!("CODEOWNERS out of date. Run `{}` to update the CODEOWNERS file", executable_name)
                 }
                 Error::InvalidTeam { name: _, path: _ } => "Found invalid team annotations".to_owned(),
             }

src/project.rs

@@ -221,7 +221,7 @@ mod tests {
             codeowners_file_path: PathBuf::from(".github/CODEOWNERS"),
             directory_codeowner_files: vec![],
             teams_by_name: HashMap::new(),
-            executable_name: "codeowners".to_string(),
+            executable_name: "codeowners generate".to_string(),
         };
 
         let map = project.vendored_gem_by_name();

tests/executable_name_config_test.rs

@@ -14,7 +14,7 @@ fn test_validate_with_custom_executable_name() -> Result<(), Box<dyn Error>> {
         &["validate"],
         false,
         OutputStream::Stdout,
-        predicate::str::contains("Run `bin/codeownership generate`"),
+        predicate::str::contains("Run `bin/codeownership validate`"),
     )?;
     Ok(())
 }
@@ -42,7 +42,7 @@ fn test_custom_executable_name_full_error_message() -> Result<(), Box<dyn Error>
         OutputStream::Stdout,
         predicate::eq(indoc! {"
 
-    CODEOWNERS out of date. Run `bin/codeownership generate` to update the CODEOWNERS file
+    CODEOWNERS out of date. Run `bin/codeownership validate` to update the CODEOWNERS file
 
     "}),
     )?;

tests/fixtures/custom_executable_name/config/code_ownership.yml

@@ -1,4 +1,4 @@
 ---
 owned_globs:
   - "{app,config}/**/*.rb"
-executable_name: "bin/codeownership"
+executable_name: "bin/codeownership validate"

tests/run_config_executable_override_test.rs

@@ -13,21 +13,20 @@ fn test_run_config_executable_path_overrides_config_file() -> Result<(), Box<dyn
     let project_path = temp_dir.path();
     git_add_all_files(project_path);
 
-    // This fixture has executable_name: "bin/codeownership" in config
-    // But we'll override it with RunConfig.executable_path
+    // This fixture has executable_name: "bin/codeownership validate" in config
+    // But we'll override it with RunConfig.executable_name
 
     let mut run_config = build_run_config(project_path, ".github/CODEOWNERS");
-    // Use a relative path that gets displayed as-is in error messages
-    run_config.executable_name = Some("my-wrapper-tool".to_string());
+    run_config.executable_name = Some("my-wrapper-tool validate".to_string());
 
     let result = validate(&run_config, vec![]);
 
-    // Should use "my-wrapper-tool" from executable_path, NOT "bin/codeownership" from config
+    // Should use "my-wrapper-tool validate" from RunConfig, NOT "bin/codeownership validate" from config
     assert!(!result.validation_errors.is_empty(), "Expected validation errors but got none");
     let error_msg = result.validation_errors.join("\n");
     assert!(
-        error_msg.contains("Run `my-wrapper-tool generate`"),
-        "Expected error to contain 'my-wrapper-tool generate' but got: {}",
+        error_msg.contains("Run `my-wrapper-tool validate`"),
+        "Expected error to contain 'my-wrapper-tool validate' but got: {}",
         error_msg
     );
     assert!(
@@ -47,19 +46,19 @@ fn test_run_config_without_executable_path_uses_config_file() -> Result<(), Box<
     let project_path = temp_dir.path();
     git_add_all_files(project_path);
 
-    // This fixture has executable_name: "bin/codeownership" in config
+    // This fixture has executable_name: "bin/codeownership validate" in config
 
     let mut run_config = build_run_config(project_path, ".github/CODEOWNERS");
     run_config.executable_name = None; // Explicitly no override
 
     let result = validate(&run_config, vec![]);
 
-    // Should use "bin/codeownership" from config file
+    // Should use "bin/codeownership validate" from config file
     assert!(!result.validation_errors.is_empty(), "Expected validation errors but got none");
     let error_msg = result.validation_errors.join("\n");
     assert!(
-        error_msg.contains("Run `bin/codeownership generate`"),
-        "Expected error to contain 'bin/codeownership generate' but got: {}",
+        error_msg.contains("Run `bin/codeownership validate`"),
+        "Expected error to contain 'bin/codeownership validate' but got: {}",
         error_msg
     );
 
@@ -75,14 +74,14 @@ fn test_run_config_executable_path_overrides_default() -> Result<(), Box<dyn Err
     let project_path = temp_dir.path();
     git_add_all_files(project_path);
 
-    // This fixture has NO executable_name in config (uses default "codeowners")
+    // This fixture has NO executable_name in config (uses default "codeowners generate")
 
     let mut run_config = build_run_config(project_path, ".github/CODEOWNERS");
-    run_config.executable_name = Some("custom-command".to_string());
+    run_config.executable_name = Some("custom-command generate".to_string());
 
     let result = validate(&run_config, vec![]);
 
-    // Should use "custom-command" from executable_path, NOT default "codeowners"
+    // Should use "custom-command generate" from RunConfig, NOT default "codeowners generate"
     assert!(!result.validation_errors.is_empty(), "Expected validation errors but got none");
     let error_msg = result.validation_errors.join("\n");
     assert!(