From 08aa198b009def18d3f43e19375381a0a9ba5b07 Mon Sep 17 00:00:00 2001
From: Overlord <overlordontwitch@gmail.com>
Date: Mon, 2 Mar 2026 20:37:31 +0100
Subject: [PATCH] Add path validation utility and integrate with CLI

---
 Cargo.toml       |  5 +----
 src/cli/flags.rs | 13 +++++++++----
 src/lib.rs       |  1 +
 src/main.rs      |  4 ++--
 src/util/fs.rs   |  6 ++++++
 src/util/mod.rs  |  1 +
 6 files changed, 20 insertions(+), 10 deletions(-)
 create mode 100644 src/util/fs.rs
 create mode 100644 src/util/mod.rs

diff --git a/Cargo.toml b/Cargo.toml
index 79ee7eb..6c1d6d3 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,9 +1,6 @@
 [package]
 name = "pmp"
-description = """\
-    PHP Macro Pre-processor (PMP) \
-    A php lexer, parser and macro pre-processor written in Rust. \
-"""
+description = "PHP Macro Pre-processor (PMP) written in Rust."
 
 version = "0.1.0-alpha"
 edition = "2024"
diff --git a/src/cli/flags.rs b/src/cli/flags.rs
index 97760ee..e763160 100644
--- a/src/cli/flags.rs
+++ b/src/cli/flags.rs
@@ -1,13 +1,18 @@
-use clap::Parser;
 use std::{
     ffi::OsStr,
     path::PathBuf
 };
+use clap::{
+    Parser,
+    ValueHint::FilePath,
+};
+
+use crate::util::fs;
 
 #[derive(Parser, Debug)]
 #[command(name = "pmp", about, version)]
 pub struct Args {
-    #[arg(long)]
+    #[arg(long, value_hint = FilePath, value_parser = fs::path_exists)]
     php: Option<PathBuf>,
 
     #[arg(long, short = 'd', hide = true)]
@@ -15,8 +20,8 @@ pub struct Args {
     #[arg(long, short = 'v')]
     verbose: bool,
 
-    #[arg(default_value_os = OsStr::new("."))]
-    files: Vec<PathBuf>,
+    #[arg(default_value_os = OsStr::new("."), value_hint = FilePath, value_parser = fs::path_exists)]
+    directory: Option<PathBuf>,
     #[arg(last = true)]
     passthrough: Vec<String>,
 }
diff --git a/src/lib.rs b/src/lib.rs
index 4f77372..714f64a 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1 +1,2 @@
 pub mod cli;
+pub mod util;
diff --git a/src/main.rs b/src/main.rs
index 30fa7e3..fcbf818 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,8 +1,8 @@
 use pmp::{ cli::Args };
 
-fn main() 
+fn main()
 {
     let args = Args::parse();
 
-    println!("{:?}", args);
+    println!("{:#?}", args);
 }
diff --git a/src/util/fs.rs b/src/util/fs.rs
new file mode 100644
index 0000000..2611755
--- /dev/null
+++ b/src/util/fs.rs
@@ -0,0 +1,6 @@
+use std::path::PathBuf;
+
+pub fn path_exists(s: &str) -> Result<PathBuf, String> {
+    let p = PathBuf::from(s);
+    p.exists().then_some(p).ok_or("path does not exist".to_string())
+}
diff --git a/src/util/mod.rs b/src/util/mod.rs
new file mode 100644
index 0000000..d521fbd
--- /dev/null
+++ b/src/util/mod.rs
@@ -0,0 +1 @@
+pub mod fs;