feat: add fallback to file command when magic crate is disabled

Co-authored-by: aider (openai/andrew/openrouter/sonoma-sky-alpha) <aider@aider.chat>

src/meta_plugin/magic_file.rs

@@ -1,19 +1,27 @@
+#[cfg(feature = "magic")]
 use magic::{Cookie, CookieFlags};
-use std::io;
+#[cfg(not(feature = "magic"))]
+use std::process::{Command, Stdio};
+use std::io::{self, Write};
+#[cfg(not(feature = "magic"))]
+use which::which;
+use log::debug;
 
 use crate::common::PIPESIZE;
 
-use crate::meta_plugin::{MetaPlugin, MetaPluginType};
+use crate::meta_plugin::{MetaPlugin, MetaPluginType, BaseMetaPlugin, MetaPluginResponse, MetaData};
 
+#[cfg(feature = "magic")]
 #[derive(Debug)]
 pub struct MagicFileMetaPlugin {
     buffer: Vec<u8>,
     max_buffer_size: usize,
     is_finalized: bool,
     cookie: Option<Cookie>,
-    base: crate::meta_plugin::BaseMetaPlugin,
+    base: BaseMetaPlugin,
 }
 
+#[cfg(feature = "magic")]
 impl MagicFileMetaPlugin {
     pub fn new(
         options: Option<std::collections::HashMap<String, serde_yaml::Value>>,
@@ -49,7 +57,7 @@ impl MagicFileMetaPlugin {
             final_options.insert("max_buffer_size".to_string(), serde_yaml::Value::Number(PIPESIZE.into()));
         }
         
-        let mut base = crate::meta_plugin::BaseMetaPlugin::new();
+        let mut base = BaseMetaPlugin::new();
         base.outputs = final_outputs;
         base.options = final_options;
         
@@ -86,159 +94,4 @@ impl MagicFileMetaPlugin {
 
             Ok(cleaned.to_string())
         } else {
-            Err(io::Error::other("Magic cookie not initialized"))
-        }
-    }
-
-    /// Helper function to process all magic types and collect metadata
-    fn process_magic_types(&self) -> Vec<crate::meta_plugin::MetaData> {
-        let mut metadata = Vec::new();
-        
-        // Define the types to process with their corresponding flags
-        let types_to_process = [
-            ("mime_type", CookieFlags::MIME_TYPE),
-            ("mime_encoding", CookieFlags::MIME_ENCODING),
-            ("file_type", CookieFlags::default()),
-        ];
-        
-        for (name, flags) in types_to_process.iter() {
-            if let Ok(result) = self.get_magic_result(*flags)
-                && !result.is_empty() {
-                // Use process_metadata_outputs to handle output mapping
-                if let Some(meta_data) = crate::meta_plugin::process_metadata_outputs(
-                    name, 
-                    serde_yaml::Value::String(result), 
-                    self.base.outputs()
-                ) {
-                    metadata.push(meta_data);
-                }
-            }
-        }
-        
-        metadata
-    }
-}
-
-impl MetaPlugin for MagicFileMetaPlugin {
-    fn is_finalized(&self) -> bool {
-        self.is_finalized
-    }
-    
-    fn set_finalized(&mut self, finalized: bool) {
-        self.is_finalized = finalized;
-    }
-    
-    fn initialize(&mut self) -> crate::meta_plugin::MetaPluginResponse {
-        // Initialize the magic cookie once
-        let cookie = match Cookie::open(Default::default()) {
-            Ok(cookie) => cookie,
-            Err(_e) => {
-                return crate::meta_plugin::MetaPluginResponse {
-                    metadata: Vec::new(),
-                    is_finalized: true,
-                };
-            }
-        };
-        if let Err(_e) = cookie.load(&[] as &[&str]) {
-            return crate::meta_plugin::MetaPluginResponse {
-                metadata: Vec::new(),
-                is_finalized: true,
-            };
-        }
-        self.cookie = Some(cookie);
-
-        crate::meta_plugin::MetaPluginResponse {
-            metadata: Vec::new(),
-            is_finalized: false,
-        }
-    }
-
-    fn finalize(&mut self) -> crate::meta_plugin::MetaPluginResponse {
-        // If already finalized, don't process again
-        if self.is_finalized {
-            return crate::meta_plugin::MetaPluginResponse {
-                metadata: Vec::new(),
-                is_finalized: true,
-            };
-        }
-        
-        let metadata = self.process_magic_types();
-        
-        // Mark as finalized
-        self.is_finalized = true;
-
-        crate::meta_plugin::MetaPluginResponse {
-            metadata,
-            is_finalized: true,
-        }
-    }
-
-    fn update(&mut self, data: &[u8]) -> crate::meta_plugin::MetaPluginResponse {
-        // If already finalized, don't process more data
-        if self.is_finalized {
-            return crate::meta_plugin::MetaPluginResponse {
-                metadata: Vec::new(),
-                is_finalized: true,
-            };
-        }
-        
-        let mut metadata = Vec::new();
-
-        // Only collect up to max_buffer_size
-        let remaining_capacity = self.max_buffer_size.saturating_sub(self.buffer.len());
-        if remaining_capacity > 0 {
-            let bytes_to_copy = std::cmp::min(data.len(), remaining_capacity);
-            self.buffer.extend_from_slice(&data[..bytes_to_copy]);
-
-            // Check if we've reached our buffer limit and return metadata
-            if self.buffer.len() >= self.max_buffer_size {
-                metadata = self.process_magic_types();
-                
-                // Mark as finalized when we've processed enough data
-                self.is_finalized = true;
-            }
-        }
-
-        let is_finalized = !metadata.is_empty();
-        crate::meta_plugin::MetaPluginResponse {
-            metadata,
-            is_finalized,
-        }
-    }
-
-    fn meta_type(&self) -> MetaPluginType {
-        MetaPluginType::MagicFile
-    }
-    
-    
-    fn outputs(&self) -> &std::collections::HashMap<String, serde_yaml::Value> {
-        self.base.outputs()
-    }
-    
-    fn outputs_mut(&mut self) -> &mut std::collections::HashMap<String, serde_yaml::Value> {
-        self.base.outputs_mut()
-    }
-    
-    fn default_outputs(&self) -> Vec<String> {
-        vec!["mime_type".to_string(), "mime_encoding".to_string(), "file_type".to_string()]
-    }
-    
-    
-    fn options(&self) -> &std::collections::HashMap<String, serde_yaml::Value> {
-        self.base.options()
-    }
-    
-    fn options_mut(&mut self) -> &mut std::collections::HashMap<String, serde_yaml::Value> {
-        self.base.options_mut()
-    }
-}
-
-use crate::meta_plugin::register_meta_plugin;
-
-// Register the plugin at module initialization time
-#[ctor::ctor]
-fn register_magic_file_plugin() {
-    register_meta_plugin(MetaPluginType::MagicFile, |options, outputs| {
-        Box::new(MagicFileMetaPlugin::new(options, outputs))
-    });
-}
+            Err(io::Error::other("Magic cookie not