Remove Lzip because its incorrect, and improve extention comparison

README.md

@@ -71,7 +71,7 @@ ouch c file.txt file.zip
 
 # Supported formats
 
-| Format    | `.tar` | `.zip` | `.bz`, `.bz2` | `.gz` | `.lz4` | `.xz`, `.lz`, `.lzma` | `.zst` |
+| Format    | `.tar` | `.zip` | `.bz`, `.bz2` | `.gz` | `.lz4` | `.xz`, `.lzma` | `.zst` |
 |:---------:|:------:|:------:|:-------------:|:-----:|:------:|:---------------------:|:------:|
 | Supported | ✓     | ✓      | ✓            | ✓     | ✓     | ✓                     | ✓     |
 

src/extension.rs

@@ -5,14 +5,20 @@ use std::{ffi::OsStr, fmt, path::Path};
 use self::CompressionFormat::*;
 
 /// A wrapper around `CompressionFormat` that allows combinations like `tgz`
-#[derive(Debug, Clone, PartialEq, Eq)]
+#[derive(Debug, Clone, Eq)]
 #[non_exhaustive]
 pub struct Extension {
     /// One extension like "tgz" can be made of multiple CompressionFormats ([Tar, Gz])
     pub compression_formats: &'static [CompressionFormat],
     /// The input text for this extension, like "tgz", "tar" or "xz"
     pub display_text: String,
 }
+// The display_text should be ignored when comparing extensions
+impl PartialEq for Extension {
+    fn eq(&self, other: &Self) -> bool {
+        self.compression_formats == other.compression_formats
+    }
+}
 
 impl Extension {
     /// # Panics:
@@ -49,7 +55,7 @@ pub enum CompressionFormat {
     Bzip,
     /// .lz4
     Lz4,
-    /// .xz .lzma .lz
+    /// .xz .lzma
     Lzma,
     /// tar, tgz, tbz, tbz2, txz, tlz, tlz4, tlzma, tzst
     Tar,
@@ -121,7 +127,7 @@ pub fn separate_known_extensions_from_name(mut path: &Path) -> (&Path, Vec<Exten
             "bz" | "bz2" => &[Bzip],
             "gz" => &[Gzip],
             "lz4" => &[Lz4],
-            "xz" | "lzma" | "lz" => &[Lzma],
+            "xz" | "lzma" => &[Lzma],
             "zst" => &[Zstd],
             _ => break,
         };

src/utils/fs.rs

@@ -75,12 +75,9 @@ pub fn try_infer_extension(path: &Path) -> Option<Extension> {
     fn is_bz2(buf: &[u8]) -> bool {
         buf.len() > 2 && buf[..=2] == [0x42, 0x5A, 0x68]
     }
-    fn is_xz(buf: &[u8]) -> bool {
+    fn is_lzma(buf: &[u8]) -> bool {
         buf.len() > 5 && buf[..=5] == [0xFD, 0x37, 0x7A, 0x58, 0x5A, 0x00]
     }
-    fn is_lz(buf: &[u8]) -> bool {
-        buf.len() > 3 && buf[..=3] == [0x4C, 0x5A, 0x49, 0x50]
-    }
     fn is_lz4(buf: &[u8]) -> bool {
         buf.len() > 3 && buf[..=3] == [0x04, 0x22, 0x4D, 0x18]
     }
@@ -110,10 +107,8 @@ pub fn try_infer_extension(path: &Path) -> Option<Extension> {
         Some(Extension::new(&[Gzip], "gz"))
     } else if is_bz2(&buf) {
         Some(Extension::new(&[Bzip], "bz2"))
-    } else if is_xz(&buf) {
-        Some(Extension::new(&[Lzma], "xz"))
-    } else if is_lz(&buf) {
-        Some(Extension::new(&[Lzma], "lz"))
+    } else if is_lzma(&buf) {
+        Some(Extension::new(&[Lzma], "lzma")) // lzma can be `xz` or `lzma`
     } else if is_lz4(&buf) {
         Some(Extension::new(&[Lz4], "lz4"))
     } else if is_zst(&buf) {

tests/integration.rs

@@ -34,7 +34,6 @@ enum FileExtension {
     Bz2,
     Gz,
     Lz4,
-    Lz,
     Lzma,
     Xz,
 }