From 0c79c6270d244fc4a3da2c789e0429e07033641c Mon Sep 17 00:00:00 2001
From: raffitz <raf.a.m.c.gon@gmail.com>
Date: Mon, 22 Mar 2021 18:33:31 +0000
Subject: [PATCH] Add file stating

---
 Cargo.lock  | 105 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 Cargo.toml  |   2 +
 src/main.rs |  28 ++++++++++++++
 3 files changed, 135 insertions(+)

diff --git a/Cargo.lock b/Cargo.lock
index 87c18f7..42ce965 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -20,6 +20,12 @@ dependencies = [
  "winapi",
 ]
 
+[[package]]
+name = "beef"
+version = "0.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6736e2428df2ca2848d846c43e88745121a6654696e349ce0054a420815a7409"
+
 [[package]]
 name = "bitflags"
 version = "1.2.1"
@@ -41,6 +47,12 @@ dependencies = [
  "vec_map",
 ]
 
+[[package]]
+name = "fnv"
+version = "1.0.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3f9eec918d3f24069decb9af1554cad7c880e2da24a9afd88aca000531ab82c1"
+
 [[package]]
 name = "hermit-abi"
 version = "0.1.17"
@@ -56,12 +68,91 @@ version = "0.2.80"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "4d58d1b70b004888f764dfbf6a26a3b0342a1632d33968e4a179d8011c760614"
 
+[[package]]
+name = "logos"
+version = "0.12.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "427e2abca5be13136da9afdbf874e6b34ad9001dd70f2b103b083a85daa7b345"
+dependencies = [
+ "logos-derive",
+]
+
+[[package]]
+name = "logos-derive"
+version = "0.12.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "56a7d287fd2ac3f75b11f19a1c8a874a7d55744bd91f7a1b3e7cf87d4343c36d"
+dependencies = [
+ "beef",
+ "fnv",
+ "proc-macro2",
+ "quote",
+ "regex-syntax",
+ "syn",
+ "utf8-ranges",
+]
+
+[[package]]
+name = "pomelo"
+version = "0.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "76dd249f63dbbc68c8caa9b5fd16b32c7ba5da56df93d40a9552c91ebfd2a1cd"
+dependencies = [
+ "pomelo-impl",
+]
+
+[[package]]
+name = "pomelo-impl"
+version = "0.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "597c3287a549da151aca6ada2795ecde089c7527bd5093114e8e0e1c3f0e52b1"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "proc-macro2"
+version = "1.0.24"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1e0704ee1a7e00d7bb417d0770ea303c1bccbabf0ef1667dae92b5967f5f8a71"
+dependencies = [
+ "unicode-xid",
+]
+
+[[package]]
+name = "quote"
+version = "1.0.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c3d0b9745dc2debf507c8422de05d7226cc1f0644216dfdfead988f9b1ab32a7"
+dependencies = [
+ "proc-macro2",
+]
+
+[[package]]
+name = "regex-syntax"
+version = "0.6.23"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "24d5f089152e60f62d28b835fbff2cd2e8dc0baf1ac13343bef92ab7eed84548"
+
 [[package]]
 name = "strsim"
 version = "0.8.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8ea5119cdb4c55b55d432abb513a0429384878c15dde60cc77b1c99de1a95a6a"
 
+[[package]]
+name = "syn"
+version = "1.0.64"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3fd9d1e9976102a03c542daa2eff1b43f9d72306342f3f8b3ed5fb8908195d6f"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "unicode-xid",
+]
+
 [[package]]
 name = "textwrap"
 version = "0.11.0"
@@ -77,6 +168,18 @@ version = "0.1.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9337591893a19b88d8d87f2cec1e73fad5cdfd10e5a6f349f498ad6ea2ffb1e3"
 
+[[package]]
+name = "unicode-xid"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f7fe0bb3479651439c9112f72b6c505038574c9fbb575ed1bf3b797fa39dd564"
+
+[[package]]
+name = "utf8-ranges"
+version = "1.0.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b4ae116fef2b7fea257ed6440d3cfcff7f190865f170cdad00bb6465bf18ecba"
+
 [[package]]
 name = "vec_map"
 version = "0.8.2"
@@ -88,6 +191,8 @@ name = "voxelmap"
 version = "0.1.0"
 dependencies = [
  "clap",
+ "logos",
+ "pomelo",
 ]
 
 [[package]]
diff --git a/Cargo.toml b/Cargo.toml
index 4e42093..a58446e 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -7,3 +7,5 @@ description = "Converts mathematical descriptions of objects to voxel maps"
 
 [dependencies]
 clap = "2.33"
+logos = "0.12"
+pomelo = "0.1.5"
diff --git a/src/main.rs b/src/main.rs
index e58dcd8..64486de 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,4 +1,6 @@
 use clap::{crate_authors, crate_description, crate_name, crate_version, App, Arg};
+use std::fs;
+use std::io::{Error, ErrorKind};
 
 macro_rules! scale_message {
     ($n:ident) => {
@@ -6,6 +8,14 @@ macro_rules! scale_message {
     };
 }
 
+fn io_error(err: Error, path: &str) -> String {
+    match err.kind() {
+        ErrorKind::NotFound => format!("{} not found", path),
+        ErrorKind::PermissionDenied => format!("Permission to read {} denied", path),
+        _ => format!("Unexpected error accessing {}", path),
+    }
+}
+
 fn main() {
     let matches = App::new(crate_name!())
         .version(crate_version!())
@@ -32,6 +42,24 @@ fn main() {
                     }
                 }),
         )
+        .arg(
+            Arg::with_name("FILE")
+                .help("The file describing the shape to map")
+                .required(true)
+                .index(1)
+                .validator(|path: String| -> Result<(), String> {
+                    match fs::metadata(&path) {
+                        Ok(stat) => {
+                            if stat.is_dir() {
+                                Err(format!("{} is a directory, not a file", path))
+                            } else {
+                                Ok(())
+                            }
+                        }
+                        Err(error) => Err(io_error(error, &path)),
+                    }
+                }),
+        )
         .get_matches();
 
     let scale = matches.value_of("scale").map(|s| s.parse::<i32>().unwrap());