better document support, print version properly, display version

.gitignore

@@ -5,3 +5,4 @@ fif_*
 *.sh
 !clippy.sh
 cargo-timing*.html
+todo.txt

Cargo.lock

@@ -176,7 +176,7 @@ checksum = "de853764b47027c2e862a995c34978ffa63c1501f2e15f987ba11bd4f9bba193"
 
 [[package]]
 name = "fif"
-version = "0.2.3+hotfix"
+version = "0.2.4"
 dependencies = [
  "cached",
  "clap",

Cargo.toml

@@ -1,7 +1,7 @@
 [package]
 name = "fif"
 description = "A command-line tool for detecting and optionally correcting files with incorrect extensions."
-version = "0.2.3+hotfix"
+version = "0.2.4"
 authors = ["Lynnesbian <lynne@bune.city>"]
 edition = "2018"
 license = "GPL-3.0-or-later"

src/extensionset.rs

@@ -16,13 +16,17 @@ impl ExtensionSet {
 			Self::Images => mime_guess::get_mime_extensions_str("image/*"),
 			Self::Videos => mime_guess::get_mime_extensions_str("video/*"),
 			Self::Audio => mime_guess::get_mime_extensions_str("audio/*"),
-			Self::Documents => Some(&[
-				"doc", "docx", "ppt", "pptx", "xls", "xlsx", "csv", "tsv", "pdf", "odt", "ods", "odp",
-			][..]),
+			Self::Documents => Some(
+				&[
+					"pdf", "doc", "docx", "ppt", "pptx", "xls", "xlsx", "csv", "tsv", "odt", "ods", "odp", "oda", "rtf", "ps",
+				][..],
+			),
 			// many compressed file types follow the name scheme "application/x.+compressed.*" - maybe this can be used
 			// somehow to extract extensions for compressed files from mime_guess?
 			Self::Archives => Some(&["zip", "tar", "gz", "zst", "xz", "rar", "7z", "bz", "bz2"][..]),
 			_ => todo!(),
-		}.unwrap().to_vec()
+		}
+		.unwrap()
+		.to_vec()
 	}
 }

src/formats.rs

@@ -37,7 +37,7 @@ fn smart_write<W: Write>(f: &mut W, writeables: &[Writable]) -> io::Result<()> {
 	for writeable in writeables {
 		match writeable {
 			Writable::Space => write!(f, " ")?,
-			Writable::Newline => writeln!(f, )?,
+			Writable::Newline => writeln!(f,)?,
 			Writable::String(s) => write!(f, "{}", s)?,
 			Writable::Path(path) => {
 				if let Some(string) = path.to_str() {
@@ -105,37 +105,38 @@ impl Format for Script {
 	}
 
 	fn rename<W: Write>(&self, f: &mut W, from: &PathBuf, to: &PathBuf) -> io::Result<()> {
-		smart_write(f, &[
+		smart_write(
+			f,
+			&[
 				"mv -v -i -- ".into(),
 				from.into(),
 				Writable::Space,
 				to.into(),
-			Writable::Newline
-		])
+				Writable::Newline,
+			],
+		)
 	}
 
 	fn no_known_extension<W: Write>(&self, f: &mut W, path: &PathBuf) -> io::Result<()> {
-		smart_write(f, &[
-			"echo No known extension for ".into(),
-			path.into(),
-			Writable::Newline
-		])
+		smart_write(
+			f,
+			&["echo No known extension for ".into(), path.into(), Writable::Newline],
+		)
 	}
 
 	fn unreadable<W: Write>(&self, f: &mut W, path: &PathBuf) -> io::Result<()> {
-		smart_write(f, &[
-			"# Failed to read ".into(),
-			path.into(),
-			Writable::Newline
-		])
+		smart_write(f, &["# Failed to read ".into(), path.into(), Writable::Newline])
 	}
 
 	fn unknown_type<W: Write>(&self, f: &mut W, path: &PathBuf) -> io::Result<()> {
-		smart_write(f, &[
+		smart_write(
+			f,
+			&[
 				"# Failed to detect mime type for ".into(),
 				path.into(),
-			Writable::Newline
-		])
+				Writable::Newline,
+			],
+		)
 	}
 
 	fn header<W: Write>(&self, _: &Entries, f: &mut W) -> io::Result<()> {

src/inspectors.rs

@@ -12,22 +12,12 @@ use crate::mimedb::MimeDb;
 
 // use log::{debug, warn};
 
-// from looking at the files in https://github.com/bojand/infer/tree/master/src/matchers, the format with the largest
-// buffer size requirement for identification requires 262 bytes, and the next largest buffer necessary is only 131
-// bytes. as only two formats need more than 128 bytes, it would be fairly reasonable to only read 128 bytes.
-// unfortunately, the format that requires 262 bytes for identification is tar, an extremely popular format (in the *nix
-// world, at least). however, tar files almost always appear wrapped in other formats (.tar.gz, .tar.zst, etc) anyway,
-// so maybe it's fine...? maybe this should be configurable by the user? i don't know.
-// empirical testing (or rather, starting from 256 and incrementing until it worked) reveals that xdg-mime requires
-// at least 265 bytes to identify a tar file.
+// rather than reading once into a large buffer, it tends to be faster to first try identifying the file from a small
+// chunk read from the top, and *then* proceeding with the large buffer. many file formats can be easily identified by
+// the first 128 bytes. of course, not all formats can, and some (OOXML...) require reading a long ways in.
 
-// additionally, since many formats can by identified with ≤64 bytes, it's worth reading 64 bytes, checking for the mime
-// type, and then reading the full 512 bytes if necessary. in most cases, this will end up being faster on the whole,
-// even though two reads are needed for certain formats, unless the directory being scanned is predominantly made up of
-// such formats.
-
-const INITIAL_BUF_SIZE: usize = 64;
-const BUF_SIZE: usize = 512;
+const INITIAL_BUF_SIZE: usize = 128;
+const BUF_SIZE: usize = 4096;
 
 pub fn mime_type<T: MimeDb>(db: &T, path: &Path) -> io::Result<Option<Mime>> {
 	let mut buffer = [0; INITIAL_BUF_SIZE];
@@ -38,19 +28,27 @@ pub fn mime_type<T: MimeDb>(db: &T, path: &Path) -> io::Result<Option<Mime>> {
 	#[allow(clippy::unused_io_amount)]
 	file.read(&mut buffer)?;
 
-	let r = db.get_type(&buffer);
+	let r = db.get_type(&buffer).filter(|mime|
+		// 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_guess::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());
 
 	if r.is_some() {
 		return Ok(r);
 	}
 
 	// attempt to read up to the BUF_SIZE bytes of the file.
-	// we've already read the first 64 bytes into a buffer, but i can't see an obvious way to reuse those 64 bytes that's
-	// faster than simply moving the seek position back to the start of the file and re-reading the whole 512 bytes.
-	// for example, starting with a buffer of 64 bytes, then creating a new 512 byte buffer from the contents of the first
-	// buffer with (512 - 64) blank bytes, then finally reading the rest, is much slower than simply reading the file
-	// twice. i don't at all doubt that there IS a way to do this efficiently, and i can think of a way in principle, but
-	// i'm not sure how to express it in a way that is both idiomatic/safe and fast.
+	// we've already read the first 128 bytes into a buffer, but i can't see an obvious way to reuse them in a way that's
+	// faster than simply moving the seek position back to the start of the file and re-reading the whole BUF_SIZE bytes.
+	// for example, reading (BUF_SIZE - INITIAL_BUF_SIZE) bytes, then concatenating the original INITIAL_BUF_SIZE buffer
+	// with this new one would presumably be faster - but it's not. i think it's more expensive to create the iterator,
+	// collect the contents, etc. i'll have to look into this more. i don't at all doubt that there IS a way to do this
+	// efficiently, and i can think of a way in principle, but i'm not sure how to express it in a way that is both
+	// idiomatic/safe and fast.
 	let mut buffer = [0; BUF_SIZE];
 	file.seek(SeekFrom::Start(0))?;
 	file.read(&mut buffer)?;
@@ -86,19 +84,9 @@ cached! {
 					// to have valid extensions.
 					[vec![String::from("xml"), String::from("svg")], possible_exts].concat()
 
-				} else if mime == Mime::from_str("application/zip").unwrap() {
-					// until proper document support is added, treat all common document extensions as zips
-					[vec![
-					String::from("zip"),
-					String::from("docx"),
-					String::from("pptx"),
-					String::from("xlsx"),
-					String::from("odt"),
-					String::from("ods"),
-					String::from("odp"),
-					String::from("pages"),
-					String::from("key"),
-					String::from("numbers")], possible_exts].concat()
+				} else if mime == Mime::from_str("application/msword").unwrap() {
+					// classic office files considered harmful
+					vec![String::from("doc"), String::from("xls"), String::from("ppt")]
 				} else {
 					possible_exts
 				})

src/main.rs

@@ -253,7 +253,8 @@ fn main() {
 	}
 
 	if results.is_empty() {
-		info!("All files have valid extensions!")
+		info!("All files have valid extensions!");
+		exit(0);
 	}
 
 	match args.output_format {

src/mimedb.rs

@@ -13,6 +13,13 @@ pub struct InferDb {
 	db: infer::Infer,
 }
 
+fn open_document_check(buf: &[u8], kind: &str) -> bool {
+	let mime = format!("application/vnd.oasis.opendocument.{}", kind);
+	let mime = mime.as_bytes();
+
+	buf.len() > 38 + mime.len() && buf.starts_with(b"PK\x03\x04") && buf[38..mime.len() + 38] == mime[..]
+}
+
 #[cfg(feature = "infer-backend")]
 impl MimeDb for InferDb {
 	fn init() -> Self {
@@ -23,6 +30,18 @@ impl MimeDb for InferDb {
 			buf.len() > 23 && buf[..23] == b"\x00\x00\x00\x0C\x6A\x50\x20\x20\x0D\x0A\x87\x0A\x6A\x70\x32\x20"[..]
 		});
 
+		info.add("application/vnd.oasis.opendocument.text", "odt", |buf| {
+			open_document_check(buf, "text")
+		});
+
+		info.add("application/vnd.oasis.opendocument.spreadsheet", "ods", |buf| {
+			open_document_check(buf, "spreadsheet")
+		});
+
+		info.add("application/vnd.oasis.opendocument.presentation", "odp", |buf| {
+			open_document_check(buf, "presentation")
+		});
+
 		info.add("image/svg+xml", "svg", |buf| {
 			// before doing the moderately expensive SVG check, we should make sure that the input is actually SGML-ish
 			// by "SGML-ish", i mean starts with anywhere from zero to ∞-1 whitespace characters, and then a less than sign,

src/parameters.rs

@@ -11,6 +11,7 @@ pub enum OutputFormat {
 }
 
 #[derive(Clap, Debug)]
+#[clap(version = option_env!("CARGO_PKG_VERSION").unwrap_or("???"))]
 pub struct Parameters {
 	/// Only examine files with these extensions (Comma-separated list)
 	#[clap(