diff --git a/rustfmt.toml b/rustfmt.toml
index a60f155..6302064 100644
--- a/rustfmt.toml
+++ b/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
diff --git a/src/files.rs b/src/files.rs
index 1c5df02..c603133 100644
--- a/src/files.rs
+++ b/src/files.rs
@@ -209,11 +209,7 @@ 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!(
-					"{}: {}",
-					path,
-					err.io_error().map_or(err.to_string(), |e| e.to_string())
-				);
+				error!("{}: {}", path, err.io_error().map_or(err.to_string(), |e| e.to_string()));
 				return None;
 			}
 			e.ok()
@@ -353,23 +349,14 @@ 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![
-						String::from("zip"),
-						String::from("docx"),
-						String::from("xlsx"),
-						String::from("pptx"),
-					],
+					vec![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
 				// 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
 			})
@@ -381,6 +368,8 @@ pub fn mime_extension_lookup(essence: String) -> Option<Vec<String>> {
 		cache.insert(essence, exts.clone());
 		exts
 	} else {
+		// this should only ever happen if cache.insert() hangs on another thread; i.e., close enough to "never" that
+		// marking this as unreachable should be fine
 		unreachable!()
 	}
 }
diff --git a/src/formats.rs b/src/formats.rs
index 5bb4d75..4c16a17 100644
--- a/src/formats.rs
+++ b/src/formats.rs
@@ -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![
-				"cat <<- '???'",
-				Newline,
-				"No known extension for ",
-				path,
-				Newline,
-				"???"
-			],
+			writablesln!["cat <<- '???'", Newline, "No known extension for ", path, Newline, "???"],
 		)
 	}
 
@@ -199,10 +192,7 @@ impl FormatSteps for Shell {
 	}
 
 	fn header<W: Write>(&self, f: &mut W) -> io::Result<()> {
-		smart_write(
-			f,
-			writablesln!["#!/usr/bin/env sh", Newline, "# ", (generated_by().as_str())],
-		)?;
+		smart_write(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![
-				"Rename-Item -Verbose -Path ",
-				from,
-				" -NewName ",
-				(to.file_name().unwrap())
-			],
+			writablesln!["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![
-				"Write-Output @'",
-				Newline,
-				"No known extension for ",
-				path,
-				Newline,
-				"'@"
-			],
+			writablesln!["Write-Output @'", Newline, "No known extension for ", path, Newline, "'@"],
 		)
 	}
 
diff --git a/src/parameters.rs b/src/parameters.rs
index 68a3b9d..2629366 100644
--- a/src/parameters.rs
+++ b/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::Images.extensions(),
-				Self::Audio.extensions(),
-				Self::Video.extensions(),
-			]
-			.concat(),
+			Self::Media => [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",
diff --git a/src/tests/mod.rs b/src/tests/mod.rs
index 89e55fd..8f26db8 100644
--- a/src/tests/mod.rs
+++ b/src/tests/mod.rs
@@ -141,10 +141,7 @@ fn simple_directory() {
 			// 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!(
-				result.recommended_path().unwrap().file_name(),
-				Some(OsStr::new("wrong.png"))
-			);
+			assert_eq!(result.recommended_path().unwrap().file_name(), Some(OsStr::new("wrong.png")));
 			continue;
 		}
 
@@ -470,10 +467,7 @@ fn verbosity() {
 #[test]
 /// Ensures `os_name()`'s output is the same as [`std::env::consts::OS`], capitalisation notwithstanding
 fn validate_os_name() {
-	assert_eq!(
-		fif::utils::os_name().to_lowercase(),
-		std::env::consts::OS.to_lowercase()
-	);
+	assert_eq!(fif::utils::os_name().to_lowercase(), std::env::consts::OS.to_lowercase());
 }
 
 #[test]