feat(cli): added base cli options

Cargo.toml

@@ -19,3 +19,5 @@ codegen-units = 1
 opt-level = "z"
 
 [dependencies]
+clap = { version = "4.5.1", features = ["cargo", "string"] }
+indoc = "2.0.4"

src/cli.rs

@@ -0,0 +1,55 @@
+use std::path::PathBuf;
+
+use clap::{arg, command, value_parser, Command};
+use indoc::indoc;
+
+use crate::utils::threads;
+
+pub fn cli() -> Command {
+    command!()
+        .arg_required_else_help(true)
+        .arg(
+            arg!([FILES] ... "Input file(s) to process")
+                .long_help(indoc! {"Input file(s) to process
+
+                If the file path contains spaces, enclose the path with double quotation marks on both sides."})
+                .value_parser(value_parser!(PathBuf))
+                .global(true)
+                .last(true),
+        )
+        .arg(
+            arg!(-d --directory <DIR> "The directory to write output file(s) to")
+                .long_help(indoc! {"The directory to write output file(s) to
+
+                Output files will be written without preserving the folder structure unless the --recursive flag is used."})
+                .value_parser(value_parser!(PathBuf)),
+        )
+        .arg(
+            arg!(-r --recursive "Preserves the folder structure when writing output file(s)")
+                .long_help(indoc! {"Preserves the folder structure when writing output file(s).
+
+                This option should be used in conjunction with the --directory option."})
+                .requires("directory"),
+        )
+        .arg(
+            arg!(-s --suffix [SUFFIX] "Adds the '@suffix' to the names of output file(s)")
+                .long_help(indoc! {"Adds the '@suffix' to the names of output file(s)
+
+                When '2x' is provided as the value, the resulting files will be renamed with the '@2x' suffix.
+                For example, a file named 'file.jpeg' will become '[email protected]'.
+
+                If no suffix is provided, the default updated suffix '@updated' will be added to the resulting files."})
+                .default_missing_value("updated"),
+        )
+        .arg(
+            arg!(-b --backup "Adds the '@backup' to the names of input file(s)")
+        )
+        .arg(
+            arg!(-t --threads <NUM> "The number of threads for concurrent processing")
+                .long_help(indoc! {"The number of threads for concurrent processing
+
+                Usage of multiple threads can speed up the execution of tasks, especially on multi-core processors.
+                By default, the number of available threads is utilized"})
+                .value_parser(value_parser!(u8).range(1..=threads::num_threads() as i64)),
+        )
+}

src/main.rs

@@ -1 +1,8 @@
-fn main() {}
+use cli::cli;
+
+mod cli;
+mod utils;
+
+fn main() {
+    let matches = cli().get_matches();
+}

src/utils/mod.rs

@@ -0,0 +1 @@
+pub mod threads;

src/utils/threads.rs

@@ -0,0 +1,7 @@
+use std::{num::NonZeroUsize, thread};
+
+pub fn num_threads() -> usize {
+    thread::available_parallelism()
+        .unwrap_or(NonZeroUsize::new(4).unwrap())
+        .get()
+}