file_icons: Add support for multiple file extensions (#36342)

Currently most icon theme extensions already support file types like
stories.tsx and stories.svelte. However within Zed itself these file
type overrides are not supported yet. This change adds support for those

Release Notes:

- Added support for icons on file extensions such as stories.tsx and
stories.svelte

crates/file_icons/src/file_icons.rs

@@ -52,6 +52,15 @@ impl FileIcons {
             }
         }
 
+        // handle cases where the file extension is made up of multiple important
+        // parts (e.g Component.stories.tsx) that refer to an alternative icon style
+        if let Some(suffix) = path.multiple_extensions() {
+            let maybe_path = get_icon_from_suffix(suffix.as_str());
+            if maybe_path.is_some() {
+                return maybe_path;
+            }
+        }
+
         // primary case: check if the files extension or the hidden file name
         // matches some icon path
         if let Some(suffix) = path.extension_or_hidden_file_name() {

crates/util/src/paths.rs

@@ -1,4 +1,5 @@
 use globset::{Glob, GlobSet, GlobSetBuilder};
+use itertools::Itertools;
 use regex::Regex;
 use serde::{Deserialize, Serialize};
 use std::cmp::Ordering;
@@ -60,6 +61,7 @@ pub trait PathExt {
         }
     }
     fn local_to_wsl(&self) -> Option<PathBuf>;
+    fn multiple_extensions(&self) -> Option<String>;
 }
 
 impl<T: AsRef<Path>> PathExt for T {
@@ -130,6 +132,27 @@ impl<T: AsRef<Path>> PathExt for T {
 
         Some(new_path.into())
     }
+
+    /// Returns a file's "full" joined collection of extensions, in the case where a file does not
+    /// just have a singular extension but instead has multiple (e.g File.tar.gz, Component.stories.tsx)
+    ///
+    /// Will provide back the extensions joined together such as tar.gz or stories.tsx
+    fn multiple_extensions(&self) -> Option<String> {
+        let path = self.as_ref();
+        let file_name = path.file_name()?.to_str()?;
+
+        let parts: Vec<&str> = file_name
+            .split('.')
+            // Skip the part with the file name extension
+            .skip(1)
+            .collect();
+
+        if parts.len() < 2 {
+            return None;
+        }
+
+        Some(parts.into_iter().join("."))
+    }
 }
 
 /// In memory, this is identical to `Path`. On non-Windows conversions to this type are no-ops. On
@@ -1727,4 +1750,23 @@ mod tests {
         assert_eq!(natural_sort("file-1.2", "file-1.10"), Ordering::Less);
         assert_eq!(natural_sort("file-1.10", "file-1.2"), Ordering::Greater);
     }
+
+    #[test]
+    fn test_multiple_extensions() {
+        // No extensions
+        let path = Path::new("/a/b/c/file_name");
+        assert_eq!(path.multiple_extensions(), None);
+
+        // Only one extension
+        let path = Path::new("/a/b/c/file_name.tsx");
+        assert_eq!(path.multiple_extensions(), None);
+
+        // Stories sample extension
+        let path = Path::new("/a/b/c/file_name.stories.tsx");
+        assert_eq!(path.multiple_extensions(), Some("stories.tsx".to_string()));
+
+        // Longer sample extension
+        let path = Path::new("/a/b/c/long.app.tar.gz");
+        assert_eq!(path.multiple_extensions(), Some("app.tar.gz".to_string()));
+    }
 }