output is now sorted 0u0

sort order: files that couldn't be read, then files with no known mimetype, then files with no known extensions, then files with the wrong extension

CHANGELOG.md

@@ -9,6 +9,8 @@ Dates are given in YYYY-MM-DD format.
 - Added .rpa (Ren'Py archive) support to infer backend
 - Added system extension set
 - [`xdg-mime`] no longer uses git version
+- Output is sorted: Files that couldn't be read, then files with no known mimetype, then files with no known extensions,
+  then files with the wrong extension
 
 ### v0.2.12 (2021-04-14)
 #### Features

Cargo.lock

@@ -202,6 +202,7 @@ dependencies = [
  "exitcode",
  "fastrand",
  "infer",
+ "itertools",
  "log",
  "mime_guess",
  "once_cell",
@@ -282,6 +283,15 @@ dependencies = [
  "cfg-if",
 ]
 
+[[package]]
+name = "itertools"
+version = "0.10.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "37d572918e350e82412fe766d24b15e6682fb2ed2bbe018280caa810397cb319"
+dependencies = [
+ "either",
+]
+
 [[package]]
 name = "lazy_static"
 version = "1.4.0"

Cargo.toml

@@ -33,6 +33,7 @@ infer = "0.4.0"
 rayon = { version = "1.5.0", optional = true }
 exitcode = "1.1.2"
 cfg-if = "1.0.0"
+itertools = "0.10.0"
 
 [target.'cfg(unix)'.dependencies]
 xdg-mime = "0.3.3"
@@ -68,6 +69,9 @@ lto = "thin"
 [profile.test]
 opt-level = 0
 
-# optimise dependencies, even when producing debug builds
+# optimise dependencies, even when producing debug and test builds
 [profile.dev.package."*"]
 opt-level = 3
+
+[profile.test.package."*"]
+opt-level = 3

src/findings.rs

@@ -6,6 +6,7 @@ use crate::inspectors::mime_extension_lookup;
 use crate::string_type::String;
 
 /// Information about a scanned file.
+#[derive(Ord, PartialOrd, Eq, PartialEq)]
 pub struct Findings<'a> {
 	/// The location of the scanned file.
 	pub file: &'a Path,

src/formats.rs

@@ -10,6 +10,7 @@ use snailquote::escape;
 
 use crate::scan_error::ScanError;
 use crate::{Findings, BACKEND};
+use itertools::Itertools;
 
 /// The current version of fif, as defined in Cargo.toml.
 const VERSION: Option<&'static str> = option_env!("CARGO_PKG_VERSION");
@@ -83,25 +84,36 @@ pub trait Format {
 		// TODO: clean this up - it's kinda messy
 		self.header(entries, f)?;
 
-		for entry in entries {
-			match entry {
-				Ok(finding) => {
-					if let Some(ext) = finding.recommended_extension() {
-						self.rename(f, finding.file, &finding.file.with_extension(ext.as_str()))?
-					} else {
-						self.no_known_extension(f, finding.file)?
-					}
-				}
+		// output will be generated in the order:
+		// - files that couldn't be read
+		// - files with no known mime type
+		// - files with no known extension
+		// - files with a known extension
+		// files that already have a correct extension won't be represented in the output.
 
-				Err(error) => {
-					// something went wrong 0uo
-					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
-						ScanError::Mime(path) => self.unknown_type(f, path)?,
-					}
-				}
+		// sort errors so unreadable files appear before files with unknown mimetypes - ScanError impls Ord such that
+		// ScanError::File > ScanError::Mime
+		let errors = entries.iter().filter_map(|e| e.as_ref().err()).sorted();
+		// sort files so that files with no known extension come before those with known extensions - None > Some("jpg")
+		let findings = entries
+			.iter()
+			.filter_map(|e| e.as_ref().ok())
+			.sorted_by(|a, b| b.recommended_extension().cmp(&a.recommended_extension()).reverse());
+
+		for error in errors {
+			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
+				ScanError::Mime(path) => self.unknown_type(f, path)?,
+			}
+		}
+
+		for finding in findings {
+			if let Some(ext) = finding.recommended_extension() {
+				self.rename(f, finding.file, &finding.file.with_extension(ext.as_str()))?
+			} else {
+				self.no_known_extension(f, finding.file)?
 			}
 		}
 

src/main.rs

@@ -18,7 +18,7 @@
 #![warn(trivial_casts, unused_lifetimes, unused_qualifications)]
 
 use std::ffi::OsStr;
-use std::io::{stdout, BufWriter};
+use std::io::{stdout, BufWriter, Write};
 use std::path::Path;
 use std::process::exit;
 
@@ -130,8 +130,6 @@ fn main() {
 		exit(0);
 	}
 
-	// TODO: sort entries in order of: valid moves, unknown mime, unknown ext, error
-
 	let mut buffered_stdout = BufWriter::new(stdout());
 
 	let result = match args.output_format {
@@ -145,6 +143,11 @@ fn main() {
 		exit(exitcode::IOERR);
 	}
 
+	if buffered_stdout.flush().is_err() {
+		error!("Failed to flush stdout.");
+		exit(exitcode::IOERR);
+	}
+
 	debug!("Done");
 }
 

src/scan_error.rs

@@ -1,7 +1,7 @@
 use std::fmt::{Display, Formatter, Result};
 use std::path::Path;
 
-#[derive(Debug)]
+#[derive(Debug, PartialEq, PartialOrd, Ord, Eq)]
 pub enum ScanError<'a> {
 	/// Something went wrong while trying to read the given file.
 	File(&'a Path),