From 02b5edae05682c329f626a4f8ad5537870bfa817 Mon Sep 17 00:00:00 2001
From: DTB <trinity@trinity.moe>
Date: Thu, 18 Jul 2024 20:43:39 -0600
Subject: [PATCH] fileis(1): feature parity with C scrut(1)

---
 src/fileis.rs | 61 ++++++++++++++++++++++++++++-----------------------
 1 file changed, 34 insertions(+), 27 deletions(-)

diff --git a/src/fileis.rs b/src/fileis.rs
index 70f62f6..9ad651e 100644
--- a/src/fileis.rs
+++ b/src/fileis.rs
@@ -19,6 +19,7 @@
 use std::{
 	env::args,
 	fs::metadata,
+	os::unix::fs::{ FileTypeExt, MetadataExt },
 	process::ExitCode,
 };
 
@@ -36,11 +37,11 @@ fn usage(s: &str) -> ExitCode {
 fn main() -> ExitCode {
 	let argv = args().collect::<Vec<String>>();
 
-	let mut sel: String; // selected options
+	let mut sel = String::from(""); // selected options
 	let mut optind: usize = 1; // argv[0]
 
 	while let Some(opt) = argv.getopt("bcdefgkprsuwxLS") {
-		if let Ok(optchr) = opt.opt() { sel.push(optchr); }
+		if let Ok(optchr) = opt.opt() { sel.push_str(optchr); }
 		else { return usage(&argv[0]); }
 
 		optind = opt.ind();
@@ -49,32 +50,38 @@ fn main() -> ExitCode {
 	if optind == argv.len() { return usage(&argv[0]); }
 
 	for arg in argv.iter().skip(optind) {
-	}
+		let fmeta; // file metadata
+		let fmode; // file mode; see chmod(1p)
+		let ftype; // file type
 
-//	do{
-//		if (!fileis_exists(*argv))
-//			return EXIT_FAILURE;
-//
-//		for (size_t i = 0; sel[i] != '\0'; ++i) {
-//			if ((sel[i] == 'b' && !fileis_block(*argv))
-//					|| (sel[i] == 'c' && !fileis_char(*argv))
-//					|| (sel[i] == 'd' && !fileis_dir(*argv))
-//					|| (sel[i] != 'e')
-//					|| (sel[i] == 'f' && !fileis_regular(*argv))
-//					|| (sel[i] == 'g' && !fileis_setgid(*argv))
-//					|| (sel[i] == 'k' && !fileis_vtx(*argv))
-//					|| (sel[i] == 'p' && !fileis_fifo(*argv))
-//					|| (sel[i] == 'r' && access(*argv, R_OK) != 0)
-//					|| (sel[i] == 'u' && !fileis_setuid(*argv))
-//					|| (sel[i] == 'w' && access(*argv, W_OK) != 0)
-//					|| (sel[i] == 'x' && access(*argv, X_OK) != 0)
-//					|| (sel[i] == 'L' && !fileis_link(*argv))
-//					|| (sel[i] == 'S' && !fileis_socket(*argv))
-//			) { return EXIT_FAILURE; }
-//		}
-//	} while (*++argv != NULL);
-//
-//	return EXIT_SUCCESS;
+		match metadata(arg) {
+			Ok(m) => fmeta = m,
+			_ => { return ExitCode::FAILURE; } // no perms or nonexistent
+		}
+
+		fmode = fmeta.mode();
+		ftype = fmeta.file_type();
+
+		for selection in sel.chars() { // run all selected tests
+			match selection {
+				'b' if ftype.is_block_device() => (),
+				'c' if ftype.is_char_device() => (),
+				'e' => (), // exists or metadata would have errored
+				'd' if fmeta.is_dir() => (),
+				'f' if fmeta.is_file() => (),
+				'g' if fmode & 0o2000 /* S_ISGID */ != 0 => (), // setgid
+				'k' if fmode & 0o1000 /* S_ISVTX */ != 0 => (), // setvtx
+				'p' if ftype.is_fifo() => (),
+				'r' if fmode & 0o0400 /* S_IRUSR */ != 0 => (), // read access
+				'u' if fmode & 0o4000 /* S_ISUID */ != 0 => (), // setuid
+				'w' if fmode & 0o0200 /* S_IWUSR */ != 0 => (), // write access
+				'x' if fmode & 0o0100 /* S_IXUSR */ != 0 => (), // exec access
+				'L' if fmeta.is_symlink() => (),
+				'S' if ftype.is_socket() => (),
+				_ => { return ExitCode::FAILURE; }
+			}
+		}
+	}
 
 	ExitCode::SUCCESS
 }