finally fixed memory leak

Cargo.toml

@@ -12,6 +12,7 @@ x11-clipboard = "*"
 alphanumeric-sort = "1.0.6"
 lscolors = { version = "0.5.0", features = [ "ansi_term" ]  }
 mime-detective = "*"
+tree_magic = "0.2.1"
 rayon = "1.0.3"
 dirs-2 = "1.1.0"
 users = "0.8"

src/files.rs

@@ -10,7 +10,7 @@ use std::os::unix::ffi::{OsStringExt, OsStrExt};
 use std::ffi::{OsStr, OsString};
 
 use lscolors::LsColors;
-use mime_detective;
+use tree_magic;
 use users::{get_current_username,
             get_current_groupname,
             get_user_by_uid,
@@ -717,10 +717,12 @@ impl File {
         Ok((size, unit))
     }
 
-    pub fn get_mime(&self) -> Option<String> {
+    // pub fn get_mime(&self) -> String {
-        let detective = mime_detective::MimeDetective::new().ok()?;
+    //     tree_magic::from_filepath(&self.path)
-        let mime = detective.detect_filepath(&self.path).ok()?;
+    // }
-        Some(mime.type_().as_str().to_string())
+
+    pub fn is_text(&self) -> bool {
+         tree_magic::match_filepath("text/plain", &self.path)
     }
 
 

src/hbox.rs

@@ -54,10 +54,18 @@ impl<T> HBox<T> where T: Widget + PartialEq {
         widget
     }
 
+    pub fn remove_widget(&mut self, index: usize) -> T {
+        self.widgets.remove(index)
+    }
+
     pub fn prepend_widget(&mut self, widget: T) {
         self.widgets.insert(0, widget);
     }
 
+    pub fn insert_widget(&mut self, index: usize, widget: T) {
+        self.widgets.insert(index, widget);
+    }
+
     pub fn toggle_zoom(&mut self) -> HResult<()> {
         self.clear().log();
         self.zoom_active = !self.zoom_active;

src/main.rs

@@ -20,6 +20,7 @@ extern crate libc;
 extern crate notify;
 extern crate parse_ansi;
 extern crate signal_notify;
+extern crate tree_magic;
 
 use failure::Fail;
 

src/preview.rs

@@ -434,6 +434,10 @@ impl Previewer {
         self.widget.set_stale()
     }
 
+    pub fn get_file(&self) -> Option<&File> {
+        self.file.as_ref()
+    }
+
     pub fn set_file(&mut self,
                     file: &File) -> HResult<()> {
         if Some(file) == self.file.as_ref() && !self.widget.is_stale()? { return Ok(()) }
@@ -458,7 +462,7 @@ impl Previewer {
                 return preview;
             }
 
-            if file.get_mime() == Some("text".to_string()) {
+            if file.is_text() {
                 return Previewer::preview_text(&file, &core, stale)
             }