From 095cd1074e5240433de67b9ffd052c0555dabd8e Mon Sep 17 00:00:00 2001
From: rabite <rabite@posteo.de>
Date: Wed, 20 Mar 2019 23:38:58 +0100
Subject: filtering by name

---
 src/file_browser.rs | 10 ++++++++++
 src/files.rs        | 22 +++++++++++++++++++++-
 src/listview.rs     | 30 +++++++++++++++++++++++++-----
 src/preview.rs      |  5 +++--
 4 files changed, 59 insertions(+), 8 deletions(-)

diff --git a/src/file_browser.rs b/src/file_browser.rs
index 2effb3d..91194f2 100644
--- a/src/file_browser.rs
+++ b/src/file_browser.rs
@@ -397,6 +397,16 @@ impl FileBrowser {
 
     pub fn update_preview(&mut self) -> HResult<()> {
         if !self.main_widget()?.ready() { return Ok(()) }
+        if self.main_widget()?
+            .widget()?
+            .lock()?
+            .as_ref()
+            .unwrap()
+            .content
+            .len() == 0 {
+                self.preview_widget_mut()?.set_stale();
+                return Ok(());
+            }
         let file = self.selected_file()?.clone();
         let selection = self.get_selection(&file).ok().cloned();
         let cached_files = self.get_cached_files(&file).ok();
diff --git a/src/files.rs b/src/files.rs
index 2ea4512..54e9049 100644
--- a/src/files.rs
+++ b/src/files.rs
@@ -61,6 +61,7 @@ pub struct Files {
     pub dirs_first: bool,
     pub reverse: bool,
     pub show_hidden: bool,
+    pub filter: Option<String>,
     pub dirty: DirtyBit
 }
 
@@ -104,6 +105,7 @@ impl Files {
             dirs_first: true,
             reverse: false,
             show_hidden: true,
+            filter: None,
             dirty: DirtyBit::new()
         };
 
@@ -148,6 +150,7 @@ impl Files {
             dirs_first: true,
             reverse: false,
             show_hidden: true,
+            filter: None,
             dirty: DirtyBit::new()
         };
 
@@ -295,8 +298,25 @@ impl Files {
         }
     }
 
+    pub fn set_filter(&mut self, filter: Option<String>) {
+        self.filter = filter;
+        self.set_dirty();
+    }
+
+    pub fn get_filter(&self) -> Option<String> {
+        self.filter.clone()
+    }
+
     pub fn len(&self) -> usize {
-        self.files.len()
+        match &self.filter {
+            None => self.files.len(),
+            Some(filter) => {
+                self.files
+                    .iter()
+                    .filter(|f| f.name.contains(filter))
+                    .count()
+            }
+        }
     }
 
     pub fn get_selected(&self) -> Vec<&File> {
diff --git a/src/listview.rs b/src/listview.rs
index 5a42308..9c0389c 100644
--- a/src/listview.rs
+++ b/src/listview.rs
@@ -51,6 +51,7 @@ impl Listable for ListView<Files> {
                 self.refresh()?;
             },
             Key::Ctrl('s') => { self.find_file().ok(); }
+            Key::Char('F') => { self.filter().log(); }
             Key::Left => self.goto_grand_parent()?,
             Key::Right => self.goto_selected()?,
             Key::Char(' ') => self.multi_select_file(),
@@ -331,6 +332,17 @@ impl ListView<Files>
         Ok(())
     }
 
+    fn filter(&mut self) -> HResult<()> {
+        let filter = self.minibuffer("filter").ok();
+        self.content.set_filter(filter);
+
+
+        if self.get_selection() > self.len() {
+            self.set_selection(self.len());
+        }
+        Ok(())
+    }
+
     fn render_line(&self, file: &File) -> String {
         let name = &file.name;
         let (size, unit) = file.calculate_size().unwrap_or((0, "".to_string()));
@@ -391,11 +403,19 @@ impl ListView<Files>
     }
 
     fn render(&self) -> Vec<String> {
-        self.content
-            .files
-            .iter()
-            .map(|file| self.render_line(&file))
-            .collect()
+        match self.content.get_filter() {
+            Some(filter) => self.content
+                .files
+                .iter()
+                .filter(|f| f.name.contains(&filter))
+                .map(|file| self.render_line(&file))
+                .collect(),
+            None => self.content
+                .files
+                .iter()
+                .map(|file| self.render_line(&file))
+                .collect()
+        }
     }
 }
 
diff --git a/src/preview.rs b/src/preview.rs
index ca99f83..4c51ceb 100644
--- a/src/preview.rs
+++ b/src/preview.rs
@@ -303,8 +303,8 @@ impl Previewer {
     pub fn set_file(&mut self,
                     file: &File,
                     selection: Option<File>,
-                    cached_files: Option<Files>) {
-        if Some(file) == self.file.as_ref() { return }
+                    cached_files: Option<Files>) -> HResult<()> {
+        if Some(file) == self.file.as_ref() && !self.widget.is_stale()? { return Ok(()) }
         self.file = Some(file.clone());
         self.selection = selection.clone();
         self.cached_files = cached_files.clone();
@@ -345,6 +345,7 @@ impl Previewer {
                 return Ok(blank)
             }
         }))));
+        Ok(())
     }
 
     pub fn reload(&mut self) {
-- 
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