clippy: replace deref() with &*, remove into_iter

- fix tests on big endian 32 bit archs
- condense the recommend_ext test
- also test writablesln!
- general engoodening

.gitignore

@@ -19,3 +19,4 @@ cargo-timing*.html
 /fif.exe
 .idea/workspace.xml
 *.sync-conflict*
+.idea/sonarlint

.idea/fif.iml

@@ -4,6 +4,31 @@
     <content url="file://$MODULE_DIR$">
       <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
       <sourceFolder url="file://$MODULE_DIR$/src/test" isTestSource="true" />
+      <sourceFolder url="file://$MODULE_DIR$/target" isTestSource="false" />
+      <sourceFolder url="file://$MODULE_DIR$/target/debug/build/bitflags-23acb0a9d3874edf/out" isTestSource="false" />
+      <sourceFolder url="file://$MODULE_DIR$/target/debug/build/crossbeam-epoch-bbe747f70e6c82f8/out" isTestSource="false" />
+      <sourceFolder url="file://$MODULE_DIR$/target/debug/build/crossbeam-utils-9309f4d80e34d8b7/out" isTestSource="false" />
+      <sourceFolder url="file://$MODULE_DIR$/target/debug/build/fif-a01af1abc82b3550/out" isTestSource="false" />
+      <sourceFolder url="file://$MODULE_DIR$/target/debug/build/indexmap-f70d5e1948c750ec/out" isTestSource="false" />
+      <sourceFolder url="file://$MODULE_DIR$/target/debug/build/lexical-core-3a59a0b45542312b/out" isTestSource="false" />
+      <sourceFolder url="file://$MODULE_DIR$/target/debug/build/libc-21832a2a55a1017a/out" isTestSource="false" />
+      <sourceFolder url="file://$MODULE_DIR$/target/debug/build/log-21f459ebfa013554/out" isTestSource="false" />
+      <sourceFolder url="file://$MODULE_DIR$/target/debug/build/memchr-a5ad9a9ced7a185e/out" isTestSource="false" />
+      <sourceFolder url="file://$MODULE_DIR$/target/debug/build/memoffset-1f9c809cb66f47ad/out" isTestSource="false" />
+      <sourceFolder url="file://$MODULE_DIR$/target/debug/build/new_mime_guess-5a19c37b0debe30e/out" isTestSource="false" />
+      <sourceFolder url="file://$MODULE_DIR$/target/debug/build/nom-f20626721c72cba3/out" isTestSource="false" />
+      <sourceFolder url="file://$MODULE_DIR$/target/debug/build/proc-macro-error-97f2fc25d9b7fc89/out" isTestSource="false" />
+      <sourceFolder url="file://$MODULE_DIR$/target/debug/build/proc-macro-error-attr-db3651ef459829ce/out" isTestSource="false" />
+      <sourceFolder url="file://$MODULE_DIR$/target/debug/build/proc-macro2-8803fbc7990cf7aa/out" isTestSource="false" />
+      <sourceFolder url="file://$MODULE_DIR$/target/debug/build/rayon-137998806e417f6b/out" isTestSource="false" />
+      <sourceFolder url="file://$MODULE_DIR$/target/debug/build/rayon-core-d3b7d50c097a4664/out" isTestSource="false" />
+      <sourceFolder url="file://$MODULE_DIR$/target/debug/build/ryu-84c31e8e8ee65998/out" isTestSource="false" />
+      <sourceFolder url="file://$MODULE_DIR$/target/debug/build/serde-8fd409d40cb77b1e/out" isTestSource="false" />
+      <sourceFolder url="file://$MODULE_DIR$/target/debug/build/serde_derive-ed28d1546b1c3ad0/out" isTestSource="false" />
+      <sourceFolder url="file://$MODULE_DIR$/target/debug/build/serde_json-5bd3c27125506bb8/out" isTestSource="false" />
+      <sourceFolder url="file://$MODULE_DIR$/target/debug/build/syn-311c4ed26db329d6/out" isTestSource="false" />
+      <sourceFolder url="file://$MODULE_DIR$/target/debug/build/unicase-1bc56b5db838db2b/out" isTestSource="false" />
+      <sourceFolder url="file://$MODULE_DIR$/target/debug/build/parking_lot_core-f8d2e72482af1f8b/out" isTestSource="false" />
       <excludeFolder url="file://$MODULE_DIR$/target" />
       <excludeFolder url="file://$MODULE_DIR$/imgs" />
       <excludeFolder url="file://$MODULE_DIR$/old" />

CHANGELOG.md

@@ -4,6 +4,14 @@ Dates are given in YYYY-MM-DD format - for example, the 15th of October 2021 is
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/), and this project adheres to
 [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## Unreleased
+### Changed
+- Updated [`new_mime_guess`] to 4.0.0
+### Fixed
+- Disabled [`smartstring`] test on unsupported architectures
+### Other
+- Use [`parking_lot`]'s `RwLock` instead of the built-in one for a slight performance increase
+
 ## v0.4.0 - 2021-10-14
 ### Added
 - `--fix` mode - instead of outputting a shell script or text file, fif will rename the misnamed files for you!
@@ -128,7 +136,7 @@ this version of `clap`, which caused the build to fail. Also, `clap` 3 beta 4 de
 - System extension set (`.dll`, `.so`, `.exe`...)
 - [`infer`] backend now supports Ren'Py archive (`.rpa`) files
 ### Changed
-- Output is now sorted: Files that couldn't be read, then files with no known mimetype, then files with no known
+- Output is now sorted: Files that couldn't be read, then files with no known MIME type, then files with no known
   extensions, then files with the wrong extension
 - Added Apple iWork document formats to Documents extension set (`.pages`, `.key`, `.numbers`)
 ### Fixed
@@ -160,7 +168,7 @@ this version of `clap`, which caused the build to fail. Also, `clap` 3 beta 4 de
 ### Added
 - fif can now traverse symlinks with the `-f`/`--follow-symlinks` flag
 ### Changed
-- Better mime type detection:
+- Better MIME type detection:
   - Consider "some/x-thing" and "some/thing" to be identical
   - Use a patched version of mime_guess (which took a while to make 0u0;) with many more extension/type mappings
 - Extensions are no longer mandatory - running fif without `-e` or `-E` will scan all files, regardless of extension
@@ -278,6 +286,8 @@ Initial commit!
 [`mime_guess`]: https://crates.io/crates/mime_guess
 [`new_mime_guess`]: https://crates.io/crates/new_mime_guess
 [`once_cell`]: https://crates.io/crates/once_cell
+[`parking_lot`]: https://crates.io/crates/parking_lot
+[`smartstring]: https://crates.io/crates/smartstring
 [`snailquote`]: https://crates.io/crates/snailquote
 [`structopt`]: https://crates.io/crates/structopt
 [`xdg-mime`]: https://crates.io/crates/xdg-mime

Cargo.lock

@@ -190,6 +190,7 @@ dependencies = [
  "new_mime_guess",
  "num_cpus",
  "once_cell",
+ "parking_lot",
  "rand",
  "rayon",
  "serde",
@@ -261,6 +262,15 @@ dependencies = [
  "cfb",
 ]
 
+[[package]]
+name = "instant"
+version = "0.1.12"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7a5bbe824c507c5da5956355e86a746d82e0e1464f65d862cc5e71da70e94b2c"
+dependencies = [
+ "cfg-if",
+]
+
 [[package]]
 name = "itertools"
 version = "0.10.1"
@@ -297,9 +307,18 @@ dependencies = [
 
 [[package]]
 name = "libc"
-version = "0.2.103"
+version = "0.2.108"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "dd8f7255a17a627354f321ef0055d63b898c6fb27eff628af4d1b66b7331edf6"
+checksum = "8521a1b57e76b1ec69af7599e75e38e7b7fad6610f037db8c79b127201b5d119"
+
+[[package]]
+name = "lock_api"
+version = "0.4.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "712a4d093c9976e24e7dbca41db895dabcbac38eb5f4045393d17a95bdfb1109"
+dependencies = [
+ "scopeguard",
+]
 
 [[package]]
 name = "log"
@@ -339,11 +358,10 @@ checksum = "2a60c7ce501c71e03a9c9c0d35b861413ae925bd979cc7a4e30d060069aaac8d"
 
 [[package]]
 name = "new_mime_guess"
-version = "3.0.1"
+version = "4.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b101054f57b10576d116bc0da7ce8b05362b4490b0d21c7748395eaaf9359047"
+checksum = "bb3253391c5e7939360b2f7f27c7e7821dbc1a0bdab65884dde484fd71132764"
 dependencies = [
- "bitflags",
  "mime",
  "phf",
  "phf_codegen",
@@ -383,6 +401,31 @@ version = "2.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "afb2e1c3ee07430c2cf76151675e583e0f19985fa6efae47d6848a3e2c824f85"
 
+[[package]]
+name = "parking_lot"
+version = "0.11.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7d17b78036a60663b797adeaee46f5c9dfebb86948d1255007a1d6be0271ff99"
+dependencies = [
+ "instant",
+ "lock_api",
+ "parking_lot_core",
+]
+
+[[package]]
+name = "parking_lot_core"
+version = "0.8.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d76e8e1493bcac0d2766c42737f34458f1c8c50c0d23bcb24ea953affb273216"
+dependencies = [
+ "cfg-if",
+ "instant",
+ "libc",
+ "redox_syscall",
+ "smallvec",
+ "winapi",
+]
+
 [[package]]
 name = "phf"
 version = "0.10.0"
@@ -424,9 +467,9 @@ dependencies = [
 
 [[package]]
 name = "ppv-lite86"
-version = "0.2.10"
+version = "0.2.15"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ac74c624d6b2d21f425f752262f42188365d7b8ff1aff74c82e45136510a4857"
+checksum = "ed0cfbc8191465bed66e1718596ee0b0b35d5ee1f41c5df2189d0fe8bde535ba"
 
 [[package]]
 name = "proc-macro-error"
@@ -454,9 +497,9 @@ dependencies = [
 
 [[package]]
 name = "proc-macro2"
-version = "1.0.30"
+version = "1.0.32"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "edc3358ebc67bc8b7fa0c007f945b0b18226f78437d61bec735a9eb96b61ee70"
+checksum = "ba508cc11742c0dc5c1659771673afbab7a0efab23aa17e854cbab0837ed0b43"
 dependencies = [
  "unicode-xid",
 ]
@@ -606,9 +649,9 @@ dependencies = [
 
 [[package]]
 name = "serde_json"
-version = "1.0.68"
+version = "1.0.71"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0f690853975602e1bfe1ccbf50504d67174e3bcf340f23b5ea9992e0587a52d8"
+checksum = "063bf466a64011ac24040a49009724ee60a57da1b437617ceb32e53ad61bfb19"
 dependencies = [
  "itoa",
  "ryu",
@@ -621,6 +664,12 @@ version = "0.3.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "533494a8f9b724d33625ab53c6c4800f7cc445895924a8ef649222dcb76e938b"
 
+[[package]]
+name = "smallvec"
+version = "1.7.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1ecab6c735a6bb4139c0caafd0cc3635748bbb3acf4550e8138122099251f309"
+
 [[package]]
 name = "smartstring"
 version = "0.2.9"
@@ -632,9 +681,9 @@ dependencies = [
 
 [[package]]
 name = "snailquote"
-version = "0.3.0"
+version = "0.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f34b729d802f52194598858ac852c3fb3b33f6e026cd03195072ccb7bf3fc810"
+checksum = "ec62a949bda7f15800481a711909f946e1204f2460f89210eaf7f57730f88f86"
 dependencies = [
  "thiserror",
  "unicode_categories",
@@ -648,9 +697,9 @@ checksum = "a2eb9349b6444b326872e140eb1cf5e7c522154d69e7a0ffb0fb81c06b37543f"
 
 [[package]]
 name = "syn"
-version = "1.0.80"
+version = "1.0.81"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d010a1623fbd906d51d650a9916aaefc05ffa0e4053ff7fe601167f3e715d194"
+checksum = "f2afee18b8beb5a596ecb4a2dce128c719b4ba399d34126b9e4396e3f9860966"
 dependencies = [
  "proc-macro2",
  "quote",

Cargo.toml

@@ -29,7 +29,7 @@ json = ["serde", "serde_json"]
 walkdir = "~2.3.2"
 log = "0.4.14"
 mime = "0.3.16"
-mime_guess = { package = "new_mime_guess", features = ["phf-map"], version = "3.0.0" }
+mime_guess = { package = "new_mime_guess", features = ["phf-map"], version = "4.0.0" }
 snailquote = "0.3.0"
 once_cell = "1.8.0"
 rayon = { version = "1.5.0", optional = true }
@@ -40,6 +40,7 @@ serde = { version = "1.0", features = ["derive"], optional = true }
 serde_json = { version = "1.0", optional = true }
 num_cpus = { version = "1.13.0", optional = true }
 maplit = "1.0.2"
+parking_lot = "0.11.2"
 
 [target.'cfg(not(unix))'.dependencies]
 xdg-mime = { version = "0.3.3", optional = true }

README.md

@@ -176,7 +176,7 @@ The five logging levels are used as follows:
 | Level | Description | Example |
 |-|-|-|
 | error | Errors that cause fif to stop running | fif was unable to open the provided directory |
-| warn | Warnings that don't cause fif to stop running | fif was unable to determine the mime type of a given file |
+| warn | Warnings that don't cause fif to stop running | fif was unable to determine the MIME type of a given file |
 | info | Information pertaining to fif's status | The provided directory was scanned without issue, and no files are in need of renaming |
 | debug | Debug information - usually not important to end users | The list of extensions fif will consider |
 | trace | Trace info - usually not important to end users | "Found 15 items to check", "Scan successful", etc. |
@@ -199,10 +199,19 @@ number will be updated as follows:
 when adding the ability to exclude extensions, and when fif gained the ability to output a bash script rather than a
 list of invalid filenames). The MINOR version will also be bumped when increasing the MSRV.
 - The PATCH version will be bumped in all other cases, including minor feature additions (in the past, this has occurred
-when adding features such as more output formats and the ignore flag).
+when adding features such as more output formats and the "ignore unknown extensions" flag).
 
 If/when fif hits version 1.0, these rules will likely remain the same as they are now.
 
+## Code style
+fif is formatted with `rustfmt` using a nightly toolchain, specifically with the command `cargo +nightly fmt`. Tabs are
+used for indentation, and are assumed to be two spaces wide. Lines are 120 characters wide. Braces are placed on the 
+same line (["OTBS"](https://en.wikipedia.org/wiki/Indentation_style#Variant:_1TBS_(OTBS)) format), except in the case of
+`where` clauses in generic parameters.
+
+For more detailed information on the formatting rules used by this project, see the configured options in
+[`rustfmt.toml`](https://gitlab.com/Lynnesbian/fif/-/blob/master/rustfmt.toml).
+
 ## License
 Copyright (C) 2021 Lynnesbian
 

rustfmt.toml

@@ -7,3 +7,5 @@ hard_tabs = true
 tab_spaces = 2
 newline_style = "Unix"
 group_imports = "StdExternalCrate"
+array_width = 100
+fn_call_width = 80

src/files.rs

@@ -8,7 +8,6 @@ use std::fs::File;
 use std::io::{self, Read, Seek, SeekFrom};
 use std::path::Path;
 use std::str::FromStr;
-use std::sync::RwLock;
 
 use cfg_if::cfg_if;
 use itertools::{Either, Itertools};
@@ -16,26 +15,43 @@ use log::{debug, error};
 use mime::Mime;
 use mime_guess::from_ext;
 use once_cell::sync::Lazy;
+use parking_lot::RwLock;
 use walkdir::{DirEntry, WalkDir};
 
 use crate::findings::{Findings, ScanError};
 use crate::mime_db::MimeDb;
 use crate::parameters::ScanOpts;
+use crate::utils::APPLICATION_ZIP;
 use crate::{String, MIMEDB};
 
-/// Cache of mimetypes and their associated extensions, used by [`mime_extension_lookup()`]
+/// Cache of MIME types and their associated extensions, used by [`mime_extension_lookup()`]
 static MIMEXT: Lazy<RwLock<HashMap<String, Option<Vec<String>>>>> = Lazy::new(|| RwLock::new(HashMap::new()));
 
+/// The number of bytes to read initially when identifying a file's MIME type. Used in the [`mime_type`] function.
+///
+/// Rather than reading the entire file all at once into a [`BUF_SIZE`] buffer, it tends to be faster to read a small
+/// chunk of the file and trying to identify that, proceeding with the larger buffer if that fails. Many file formats
+/// can be identified with the first few dozen bytes, so the "happy path" will likely be taken in the majority of cases.
+pub const INITIAL_BUF_SIZE: usize = 128;
+
+/// The number of bytes to read if the file couldn't be identified from its first [`INITIAL_BUF_SIZE`] bytes. Used in
+/// the [`mime_type`] function.
+pub const BUF_SIZE: usize = 8192;
+
+/// A [`Mime`] representing the "application/x-ole-storage" MIME type.
+static APPLICATION_X_OLE_STORAGE: Lazy<Mime> = Lazy::new(|| Mime::from_str("application/x-ole-storage").unwrap());
+
 cfg_if! {
 	if #[cfg(windows)] {
 		/// Determines whether or not a file is hidden by checking its win32 file attributes.
 		pub fn is_hidden(entry: &DirEntry) -> bool {
-		use std::os::windows::prelude::*;
+			use std::os::windows::prelude::*;
-		std::fs::metadata(entry.path()) // try to get metadata for file
+			const FILE_ATTRIBUTE_HIDDEN: u32 = 0x2; // http://docs.microsoft.com/windows/win32/fileio/file-attribute-constants
-			.map_or(
+			std::fs::metadata(entry.path()) // try to get metadata for file
-				false,                             // if getting metadata/attributes fails, assume it's not hidden
+				.map_or(
-				|f| f.file_attributes() & 0x2 > 0, // flag for hidden - https://docs.microsoft.com/windows/win32/fileio/file-attribute-constants
+					false, // if getting metadata/attributes fails, assume it's not hidden
-			)
+					|f| f.file_attributes() & FILE_ATTRIBUTE_HIDDEN > 0,
+				)
 		}
 	} else {
 		/// Determines whether or not a file is hidden by checking for a leading full stop.
@@ -97,29 +113,29 @@ pub fn wanted_file(
 /// Inspects the given entry, returning a [`Findings`] on success and a [`ScanError`] on failure.
 ///
 /// In the event of an IO error, the returned [`ScanError`] will be of type [`ScanError::File`]. Otherwise, a
-/// [`ScanError::Mime`] will be returned, meaning that the file was scanned successfully, but a mimetype could not be
+/// [`ScanError::Mime`] will be returned, meaning that the file was scanned successfully, but a MIME type could not be
 /// determined.
 pub fn scan_file(entry: &DirEntry, canonical_paths: bool) -> Result<Findings, ScanError> {
 	let path = entry.path();
-	// try to determine mimetype for this entry
+	// try to determine MIME type for this entry
 	let result = match mime_type(&*MIMEDB, path) {
 		// an error occurred while trying to read the file
 		Err(_) => return Err(ScanError::File(path)),
-		// the file was read successfully, but we were unable to determine its mimetype
+		// the file was read successfully, but we were unable to determine its MIME type
 		Ok(None) => return Err(ScanError::Mime(path)),
-		// a mimetype was found!
+		// a MIME type was found!
 		Ok(Some(result)) => result,
 	};
 
-	// set of known extensions for the given mimetype
+	// set of known extensions for the given MIME type
 	let known_exts = mime_extension_lookup(result.essence_str().into());
 	// file extension for this particular file
 	let entry_ext = path.extension();
 
 	let valid = match known_exts {
-		// there is a known set of extensions for this mimetype, and the file has an extension
+		// there is a known set of extensions for this MIME type, and the file has an extension
 		Some(e) if entry_ext.is_some() => e.contains(&entry_ext.unwrap().to_string_lossy().to_lowercase().into()),
-		// either this file has no extension, or there is no known set of extensions for this mimetype :(
+		// either this file has no extension, or there is no known set of extensions for this MIME type :(
 		Some(_) | None => false,
 	};
 
@@ -158,7 +174,7 @@ pub fn scan_from_walkdir(
 						chunk
 							.iter() // iter over the chunk, which is a slice of DirEntry structs
 							.map(|entry| scan_file(entry, canonical_paths))
-							.collect::<Vec<_>>() // TODO: is there a way to avoid having to collect here?
+							.collect::<Vec<_>>()
 					}).partition_map(|result| match result {
 					Ok(f) => Either::Left(f),
 					Err(e) => Either::Right(e),
@@ -208,11 +224,7 @@ pub fn scan_directory(
 				// TODO: is there a way to just say `map_or(x, |y| y).thing()` instead of `map_or(x.thing(), |y| y.thing())`?
 				// i don't care whether i'm returning a walkdir error or an io error, i just care about whether or not it
 				// implements ToString (which they both do). map_or doesn't work on trait objects though :(
-				error!(
+				error!("{}: {}", path, err.io_error().map_or(err.to_string(), |e| e.to_string()));
-					"{}: {}",
-					path,
-					err.io_error().map_or(err.to_string(), |e| e.to_string())
-				);
 				return None;
 			}
 			e.ok()
@@ -236,17 +248,7 @@ pub fn scan_directory(
 	}
 }
 
-/// The number of bytes to read initially.
+/// Tries to identify the MIME type of a file from a given path.
-///
-/// Rather than reading the entire file all at once into a [`BUF_SIZE`] buffer, it tends to be faster to read a small
-/// chunk of the file and trying to identify that, proceeding with the larger buffer if that fails. Many file formats
-/// can be identified with the first few dozen bytes, so the "happy path" will likely be taken in the majority of cases.
-pub const INITIAL_BUF_SIZE: usize = 128;
-
-/// The number of bytes to read if the file couldn't be identified from its first [`INITIAL_BUF_SIZE`] bytes.
-pub const BUF_SIZE: usize = 8192;
-
-/// Tries to identify the mimetype of a file from a given path.
 pub fn mime_type<T: MimeDb>(db: &T, path: &Path) -> io::Result<Option<Mime>> {
 	let mut buffer = [0; INITIAL_BUF_SIZE];
 	let mut file = File::open(path)?;
@@ -275,17 +277,17 @@ pub fn mime_type<T: MimeDb>(db: &T, path: &Path) -> io::Result<Option<Mime>> {
 	}
 
 	let r = r.filter(|mime|
-		// some mime types should be investigated further, reading up to BUF_SIZE even if they've been determined already
+		// some MIME types should be investigated further, reading up to BUF_SIZE even if they've been determined already
 		// one such type is XML - there's many more specific types that can be determined by reading further (such as SVG)
 		mime != &mime::TEXT_XML
 			// another is ZIP - many file formats (DOCX, ODT, JAR...) are just ZIP files with particular data structures.
 			// determining that a file is in one of the MS office formats in particular requires looking quite far into the
 			// file.
-			&& mime != &Mime::from_str("application/zip").unwrap()
+			&& mime != &*APPLICATION_ZIP
 			// doc/ppt/xls files are a subset of what's known as an "OLE2 compound document storage", at least according to
 			// shared-mime-info. if a pre-OOXML era MS office file is scanned and identified as x-ole-storage, reading further
 			// will allow it to be detected correctly as the appropriate filetype.
-			&& mime != &Mime::from_str("application/x-ole-storage").unwrap());
+			&& mime != &*APPLICATION_X_OLE_STORAGE);
 
 	if r.is_some() {
 		return Ok(r);
@@ -298,15 +300,13 @@ pub fn mime_type<T: MimeDb>(db: &T, path: &Path) -> io::Result<Option<Mime>> {
 	Ok(db.get_type(&buffer))
 }
 
-/// Returns a list of known extensions for this mime type, if any.
+/// Returns a list of known extensions for this MIME type, if any.
 /// This function uses the [`Mime`]'s "essence" rather than the [`Mime`] itself - [`mime_guess::get_mime_extensions`]
 /// ignores the type suffix, treating "image/svg+xml" as "image/svg", and thus fails to find any extensions. Passing the
 /// `essence_str` (which includes the suffix) fixes this.
 pub fn mime_extension_lookup(essence: String) -> Option<Vec<String>> {
-	if let Ok(cache) = MIMEXT.read() {
+	if let Some(exts) = MIMEXT.read().get(&essence) {
-		if let Some(exts) = cache.get(&essence) {
+		return exts.clone();
-			return exts.clone();
-		}
 	}
 
 	let mut exts = mime_guess::get_mime_extensions_str(essence.as_str());
@@ -352,23 +352,14 @@ pub fn mime_extension_lookup(essence: String) -> Option<Vec<String>> {
 			} else if essence == "application/zip" {
 				// neither xdg-mime nor infer seem to be able to detect office XML files properly...
 				[
-					vec![
+					vec![String::from("zip"), String::from("docx"), String::from("xlsx"), String::from("pptx")],
-						String::from("zip"),
-						String::from("docx"),
-						String::from("xlsx"),
-						String::from("pptx"),
-					],
 					possible_exts,
 				]
 				.concat()
 			} else if essence == "application/x-ms-dos-executable" {
-				// .dll, .exe, and .scr files are given the same mime type... but you definitely don't want to rename one to the
+				// .dll, .exe, and .scr files are given the same MIME type... but you definitely don't want to rename one to the
 				// other!
-				[
+				[vec![String::from("dll"), String::from("exe"), String::from("scr")], possible_exts].concat()
-					vec![String::from("dll"), String::from("exe"), String::from("scr")],
-					possible_exts,
-				]
-				.concat()
 			} else {
 				possible_exts
 			})
@@ -376,10 +367,6 @@ pub fn mime_extension_lookup(essence: String) -> Option<Vec<String>> {
 		None => None,
 	};
 
-	if let Ok(mut cache) = MIMEXT.write() {
+	MIMEXT.write().insert(essence, exts.clone());
-		cache.insert(essence, exts.clone());
+	exts
-		exts
-	} else {
-		unreachable!()
-	}
 }

src/findings.rs

@@ -20,9 +20,9 @@ use crate::String;
 pub struct Findings {
 	/// The location of the scanned file.
 	pub file: PathBuf,
-	/// Whether or not the file's extension is valid for its mimetype.
+	/// Whether or not the file's extension is valid for its MIME type.
 	pub valid: bool,
-	/// The file's mimetype.
+	/// The file's MIME type.
 	pub mime: Mime,
 }
 
@@ -79,7 +79,7 @@ impl serde::Serialize for Findings {
 pub enum ScanError<'a> {
 	/// Something went wrong while trying to read the given file.
 	File(&'a Path),
-	/// Failed to determine the mimetype of the given file.
+	/// Failed to determine the MIME type of the given file.
 	Mime(&'a Path),
 }
 
@@ -90,7 +90,7 @@ impl<'a> Display for ScanError<'a> {
 			"Couldn't {} file: {}",
 			match self {
 				Self::File(_) => "read",
-				Self::Mime(_) => "determine mime type of",
+				Self::Mime(_) => "determine MIME type of",
 			},
 			match self {
 				Self::File(f) | Self::Mime(f) => f.to_string_lossy(),

src/formats.rs

@@ -136,7 +136,7 @@ pub trait FormatSteps {
 			match error {
 				// failed to read the file
 				ScanError::File(path) => self.unreadable(f, path)?,
-				// file was read successfully, but we couldn't determine a mimetype
+				// file was read successfully, but we couldn't determine a MIME type
 				ScanError::Mime(path) => self.unknown_type(f, path)?,
 			}
 		}
@@ -179,14 +179,7 @@ impl FormatSteps for Shell {
 	fn no_known_extension<W: Write>(&self, f: &mut W, path: &Path) -> io::Result<()> {
 		smart_write(
 			f,
-			writablesln![
+			writablesln!["cat <<- '???'", Newline, "No known extension for ", path, Newline, "???"],
-				"cat <<- '???'",
-				Newline,
-				"No known extension for ",
-				path,
-				Newline,
-				"???"
-			],
 		)
 	}
 
@@ -195,14 +188,11 @@ impl FormatSteps for Shell {
 	}
 
 	fn unknown_type<W: Write>(&self, f: &mut W, path: &Path) -> io::Result<()> {
-		smart_write(f, writablesln!["# Failed to detect mime type for ", path])
+		smart_write(f, writablesln!["# Failed to detect MIME type for ", path])
 	}
 
 	fn header<W: Write>(&self, f: &mut W) -> io::Result<()> {
-		smart_write(
+		smart_write(f, writablesln!["#!/usr/bin/env sh", Newline, "# ", (generated_by().as_str())])?;
-			f,
-			writablesln!["#!/usr/bin/env sh", Newline, "# ", (generated_by().as_str())],
-		)?;
 
 		if let Ok(working_directory) = std::env::current_dir() {
 			smart_write(f, writablesln!["# Run from ", (working_directory.as_path())])?;
@@ -232,26 +222,14 @@ impl FormatSteps for PowerShell {
 		// there doesn't seem to be a way to rename the file, prompting only if the target already exists.
 		smart_write(
 			f,
-			writablesln![
+			writablesln!["Rename-Item -Verbose -Path ", from, " -NewName ", (to.file_name().unwrap())],
-				"Rename-Item -Verbose -Path ",
-				from,
-				" -NewName ",
-				(to.file_name().unwrap())
-			],
 		)
 	}
 
 	fn no_known_extension<W: Write>(&self, f: &mut W, path: &Path) -> io::Result<()> {
 		smart_write(
 			f,
-			writablesln![
+			writablesln!["Write-Output @'", Newline, "No known extension for ", path, Newline, "'@"],
-				"Write-Output @'",
-				Newline,
-				"No known extension for ",
-				path,
-				Newline,
-				"'@"
-			],
 		)
 	}
 
@@ -263,7 +241,7 @@ impl FormatSteps for PowerShell {
 	}
 
 	fn unknown_type<W: Write>(&self, f: &mut W, path: &Path) -> io::Result<()> {
-		smart_write(f, writablesln!["<# Failed to detect mime type for ", path, " #>"])
+		smart_write(f, writablesln!["<# Failed to detect MIME type for ", path, " #>"])
 	}
 
 	fn header<W: Write>(&self, f: &mut W) -> io::Result<()> {

src/main.rs

@@ -215,16 +215,16 @@ fn main() {
 	} else {
 		let mut buffered_stdout = BufWriter::new(stdout());
 
-		let result = match args.output_format {
+		if match args.output_format {
 			// TODO: simplify this to something like formats::write_all(args.output_format, ...)
 			OutputFormat::Sh => formats::Shell.write_all(&mut buffered_stdout, &findings, &errors),
 			OutputFormat::PowerShell => formats::PowerShell.write_all(&mut buffered_stdout, &findings, &errors),
 			#[cfg(feature = "json")]
 			OutputFormat::Json => formats::Json.write_all(&mut buffered_stdout, &findings, &errors),
 			OutputFormat::Text => formats::Text.write_all(&mut buffered_stdout, &findings, &errors),
-		};
+		}
-
+		.is_err()
-		if result.is_err() {
+		{
 			error!("Failed to write to stdout.");
 			exit(exitcode::IOERR);
 		}

src/mime_db.rs

@@ -18,7 +18,7 @@ use mime::Mime;
 pub trait MimeDb {
 	/// Initialise the database.
 	fn init() -> Self;
-	/// Given a slice of bytes, returns the inferred mimetype, if any.
+	/// Given a slice of bytes, returns the inferred MIME type, if any.
 	fn get_type(&self, data: &[u8]) -> Option<Mime>;
 }
 

src/parameters.rs

@@ -319,12 +319,7 @@ impl ExtensionSet {
 			Self::Images => mime_guess::get_mime_extensions_str("image/*").unwrap().to_vec(),
 			Self::Audio => mime_guess::get_mime_extensions_str("audio/*").unwrap().to_vec(),
 			Self::Video => mime_guess::get_mime_extensions_str("video/*").unwrap().to_vec(),
-			Self::Media => [
+			Self::Media => [Self::Images.extensions(), Self::Audio.extensions(), Self::Video.extensions()].concat(),
-				Self::Images.extensions(),
-				Self::Audio.extensions(),
-				Self::Video.extensions(),
-			]
-			.concat(),
 			Self::Documents => vec![
 				"pdf", "doc", "docx", "ppt", "pptx", "xls", "xlsx", "csv", "tsv", "odt", "ods", "odp", "oda", "rtf", "ps",
 				"pages", "key", "numbers",

src/tests/mod.rs

@@ -29,13 +29,13 @@ const ZIP_BYTES: &[u8] = b"PK\x03\x04";
 /// Ensure that `extension_from_path` successfully returns the extension from a set of paths.
 fn get_ext() {
 	let ext_checks: HashMap<_, Option<&OsStr>> = hashmap![
-	Path::new("test.txt") => Some(OsStr::new("txt")),
+		Path::new("test.txt") => Some(OsStr::new("txt")),
-	Path::new("test.zip") => Some(OsStr::new("zip")),
+		Path::new("test.zip") => Some(OsStr::new("zip")),
-	Path::new("test.tar.gz") => Some(OsStr::new("gz")),
+		Path::new("test.tar.gz") => Some(OsStr::new("gz")),
-	Path::new("test.") => Some(OsStr::new("")),
+		Path::new("test.") => Some(OsStr::new("")),
-	Path::new("test") => None,
+		Path::new("test") => None,
-	Path::new(".hidden") => None,
+		Path::new(".hidden") => None,
-		];
+	];
 
 	for (path, ext) in ext_checks {
 		assert_eq!(path.extension(), ext);
@@ -43,7 +43,7 @@ fn get_ext() {
 }
 
 #[test]
-/// Ensure that the mime types for JPEG, PNG, PDF, and ZIP are detected from their magic numbers.
+/// Ensure that the MIME types for JPEG, PNG, PDF, and ZIP are detected from their magic numbers.
 fn detect_type() {
 	assert_eq!(MIMEDB.get_type(JPEG_BYTES), Some(IMAGE_JPEG));
 	assert_eq!(MIMEDB.get_type(PNG_BYTES), Some(IMAGE_PNG));
@@ -55,23 +55,28 @@ fn detect_type() {
 /// Ensure that `mime_extension_lookup` works as expected, and that the set of extensions for JPEG, PNG, PDF, and ZIP
 /// contain "jpg", "png", "pdf", and "zip", respectively.
 fn recommend_ext() {
-	assert!(mime_extension_lookup(IMAGE_JPEG.essence_str().into())
+	let tests = hashmap![
-		.unwrap()
+		&IMAGE_JPEG => "jpg",
-		.contains(&String::from("jpg")));
+		&IMAGE_PNG => "png",
-	assert!(mime_extension_lookup(IMAGE_PNG.essence_str().into())
+		&APPLICATION_PDF => "pdf",
-		.unwrap()
+		&*APPLICATION_ZIP => "zip",
-		.contains(&String::from("png")));
+	];
-	assert!(mime_extension_lookup(APPLICATION_PDF.essence_str().into())
+
-		.unwrap()
+	for (mime, ext) in tests {
-		.contains(&String::from("pdf")));
+		assert!(
-	assert!(mime_extension_lookup(APPLICATION_ZIP.essence_str().into())
+			mime_extension_lookup(mime.essence_str().into())
-		.unwrap()
+				.unwrap()
-		.contains(&String::from("zip")));
+				.contains(&String::from(ext)),
+			"mime_extension_lookup for {} didn't contain {}!",
+			mime.essence_str(),
+			ext
+		);
+	}
 }
 
 #[test]
 /// Create a simple directory with some files, run `scan_directory` on it, and ensure that the files have their
-/// associated mime types correctly deduced.
+/// associated MIME types correctly deduced.
 fn simple_directory() {
 	use std::borrow::Borrow;
 	use std::env::set_current_dir;
@@ -136,19 +141,16 @@ fn simple_directory() {
 			// the only invalid file detected should be "wrong.jpg", which is a misnamed png file
 			// 1. ensure detected extension is "jpg"
 			assert_eq!(result.file.as_path().extension().unwrap(), OsStr::new("jpg"));
-			// 2. ensure detected mime type is IMAGE_PNG
+			// 2. ensure detected MIME type is IMAGE_PNG
 			assert_eq!(result.mime, IMAGE_PNG);
 			// 3. ensure the recommended extension for "wrong.jpg" is "png"
 			assert_eq!(&result.recommended_extension().unwrap(), &String::from("png"));
 			// 4. ensure the recommended filename for "wrong.jpg" is "wrong.png"
-			assert_eq!(
+			assert_eq!(result.recommended_path().unwrap().file_name(), Some(OsStr::new("wrong.png")));
-				result.recommended_path().unwrap().file_name(),
-				Some(OsStr::new("wrong.png"))
-			);
 			continue;
 		}
 
-		// check if the recommended extension for this file is in the list of known extensions for its mimetype - for
+		// check if the recommended extension for this file is in the list of known extensions for its MIME type - for
 		// example, if the file is determined to be an IMAGE_PNG, its recommended extension should be one of the extensions
 		// returned by `mime_extension_lookup(IMAGE_PNG)`.
 		assert!(mime_extension_lookup(result.mime.essence_str().into())
@@ -164,8 +166,8 @@ fn simple_directory() {
 			.to_string_lossy()
 			.starts_with("test"));
 
-		// make sure the guessed mimetype is correct based on the extension of the scanned file
+		// make sure the guessed MIME type is correct based on the extension of the scanned file
-		// because we already know that the extensions match the mimetype (as we created these files ourselves earlier in
+		// because we already know that the extensions match the MIME type (as we created these files ourselves earlier in
 		// the test), all files with the "jpg" extension should be IMAGE_JPEGs, etc.
 		let ext = result.file.as_path().extension().unwrap();
 		assert_eq!(
@@ -403,7 +405,7 @@ fn test_json() {
 		.read_to_string(&mut contents)
 		.expect("Failed to read from cursor to string");
 
-	// the output should contain the file's mime type
+	// the output should contain the file's MIME type
 	assert!(
 		contents.contains(IMAGE_JPEG.essence_str()),
 		"JSON output doesn't contain move command!\n===\n{}",
@@ -430,15 +432,20 @@ fn media_contains_audio_video_images() {
 }
 
 #[test]
-/// Ensure that the `writables!` macro produces the output it should.
+/// Ensure that the `writables!` and `writablesln!` macros produce the output they should.
 fn writables_is_correct() {
 	use fif::formats::Writable;
-	use fif::writables;
+	use fif::{writables, writablesln};
 
 	assert_eq!(
 		&["henlo".into(), Path::new("henlo").into(), Writable::Newline,],
 		writables!["henlo", (Path::new("henlo")), Newline]
 	);
+
+	assert_eq!(
+		&["henlo".into(), Path::new("henlo").into(), Writable::Newline, Writable::Newline],
+		writablesln!["henlo", (Path::new("henlo")), Newline]
+	);
 }
 
 #[test]
@@ -470,10 +477,7 @@ fn verbosity() {
 #[test]
 /// Ensures `os_name()`'s output is the same as [`std::env::consts::OS`], capitalisation notwithstanding
 fn validate_os_name() {
-	assert_eq!(
+	assert_eq!(fif::utils::os_name().to_lowercase(), std::env::consts::OS.to_lowercase());
-		fif::utils::os_name().to_lowercase(),
-		std::env::consts::OS.to_lowercase()
-	);
 }
 
 #[test]
@@ -505,6 +509,7 @@ fn sort_findings() {
 }
 
 #[test]
+#[cfg(not(all(target_endian = "big", target_pointer_width = "32")))]
 /// Ensures that [`SmartString`]s don't deviate from std's Strings
 fn validate_string_type() {
 	use std::string::String as StdString;
@@ -516,6 +521,6 @@ fn validate_string_type() {
 		SmartString::from("A long and therefore heap-allocated string"),
 		StdString::from("A long and therefore heap-allocated string")
 	);
-	// uncomment if i ever update to smartstring >= 0.2.9
+
 	smartstring::validate();
 }

src/utils.rs

@@ -39,7 +39,7 @@ pub static CLAP_LONG_VERSION: Lazy<String> = Lazy::new(|| {
 	.into()
 });
 
-/// A [`Mime`] representing the "application/zip" mimetype.
+/// A [`Mime`] representing the "application/zip" MIME type.
 pub static APPLICATION_ZIP: Lazy<Mime> = Lazy::new(|| Mime::from_str("application/zip").unwrap());
 
 /// Returns the name of the target operating system with proper casing, like "Windows" or "macOS".