Add the directory subcommand.

source/cli/mod.rs

@@ -27,6 +27,13 @@ pub enum MainSubcommand {
     command: ArgumentsSubcommand,
   },
 
+  /// The directory subcommand.
+  Directory {
+    /// The directory subcommands.
+    #[command(subcommand)]
+    command: DirectorySubcommand,
+  },
+
   /// The file subcommand.
   File {
     /// The file subcommands.
@@ -61,7 +68,19 @@ pub enum ArgumentsSubcommand {
   },
 }
 
-/// The file subcommands
+/// The directory subcommands.
+#[derive(Debug, Subcommand)]
+pub enum DirectorySubcommand {
+  /// Check whether a directory exists, if the directory does not exist the exit
+  /// code will be 1.
+  Exists {
+    /// The path to a potential directory.
+    #[arg()]
+    directory: PathBuf,
+  },
+}
+
+/// The file subcommands.
 #[derive(Debug, Subcommand)]
 pub enum FileSubcommand {
   /// Check whether a file exists, if the file does not exist the exit code will

source/cli/run.rs

@@ -3,7 +3,8 @@
 use {
   crate::{
     cli::{
-      ArgumentsSubcommand, Cli, FileSubcommand, MainSubcommand::*, Parser,
+      ArgumentsSubcommand, Cli, DirectorySubcommand, FileSubcommand,
+      MainSubcommand::*, Parser,
     },
     logging::append_line_to_file,
   },
@@ -29,6 +30,16 @@ pub fn run() {
       }
     },
 
+    Directory {
+      command: directory_subcommand,
+    } => match directory_subcommand {
+      DirectorySubcommand::Exists { directory } => {
+        if !(directory.exists() && directory.is_dir()) {
+          std::process::exit(1);
+        }
+      }
+    },
+
     File {
       command: file_subcommand,
     } => match file_subcommand {