Implement opening with encoding

Cargo.toml

@@ -25,6 +25,7 @@ chrono = "0.4.40"
 clap = { version = "4.5.31", features = ["derive"] }
 console = "0.15.10"
 dirs = "6.0.0"
+encoding_rs = "0.8.35"
 humansize = "2.1.3"
 image = "0.25.5"
 infer = "0.19.0"

README.md

@@ -156,6 +156,14 @@ highlight_theme = "base16-ocean.dark"
 # Whether image file preview is enabled in the object preview.
 # type: bool
 image = false
+# Array of labels for the encoding want to use.
+# Label names should be specified from https://encoding.spec.whatwg.org/#names-and-labels.
+# type: array of strings
+encodings = [
+  "utf-8",
+  "utf-16be",
+  "utf-16le",
+]
 ```
 
 ### Syntax highlighting
@@ -223,8 +231,10 @@ https://www.sublimetext.com/docs/syntax.html
   - It must be enabled in the [config](#config-file-format)
 - image preview (by [ratatui-image](/~https://github.com/benjajaja/ratatui-image))
   - It must be enabled in the [config](#config-file-format)
+- open with encoding
+  - Available encodings can be specified in the [config](#config-file-format).
 
-<img src="./img/object-preview.png" width=400> <img src="./img/object-preview-image.png" width=400>
+<img src="./img/object-preview.png" width=400> <img src="./img/object-preview-image.png" width=400> <img src="./img/object-preview-encoding.png" width=400>
 
 ## Troubleshooting
 

src/config.rs

@@ -62,6 +62,12 @@ pub struct PreviewConfig {
     pub highlight_theme: String,
     #[default = false]
     pub image: bool,
+    #[default(vec![
+        "utf-8".into(),
+        "utf-16be".into(),
+        "utf-16le".into(),
+    ])]
+    pub encodings: Vec<String>,
 }
 
 fn default_download_dir() -> String {

src/pages/object_preview.rs

@@ -14,8 +14,8 @@ use crate::{
     object::{FileDetail, ObjectKey, RawObject},
     pages::util::{build_helps, build_short_helps},
     widget::{
-        self, ImagePreview, ImagePreviewState, InputDialog, InputDialogState, TextPreview,
-        TextPreviewState,
+        self, EncodingDialog, EncodingDialogState, ImagePreview, ImagePreviewState, InputDialog,
+        InputDialogState, TextPreview, TextPreviewState,
     },
 };
 
@@ -30,6 +30,7 @@ pub struct ObjectPreviewPage {
     object_key: ObjectKey,
 
     view_state: ViewState,
+    encoding_dialog_state: EncodingDialogState,
 
     ctx: Rc<AppContext>,
     tx: Sender,
@@ -46,6 +47,7 @@ enum ViewState {
     #[default]
     Default,
     SaveDialog(InputDialogState),
+    EncodingDialog,
 }
 
 impl ObjectPreviewPage {
@@ -58,6 +60,8 @@ impl ObjectPreviewPage {
         ctx: Rc<AppContext>,
         tx: Sender,
     ) -> Self {
+        let encoding_dialog_state = EncodingDialogState::new(&ctx.config.preview.encodings);
+
         let preview_type = if infer::is_image(&object.bytes) {
             let (state, msg) =
                 ImagePreviewState::new(&object.bytes, ctx.env.image_picker.clone().into());
@@ -71,6 +75,7 @@ impl ObjectPreviewPage {
                 &object,
                 ctx.config.preview.highlight,
                 &ctx.config.preview.highlight_theme,
+                encoding_dialog_state.selected(),
             );
             if let Some(msg) = msg {
                 tx.send(AppEventType::NotifyWarn(msg));
@@ -86,6 +91,7 @@ impl ObjectPreviewPage {
             path,
             object_key,
             view_state: ViewState::Default,
+            encoding_dialog_state,
             ctx,
             tx,
         }
@@ -136,6 +142,9 @@ impl ObjectPreviewPage {
                 key_code_char!('S') => {
                     self.open_save_dialog();
                 }
+                key_code_char!('e') => {
+                    self.open_encoding_dialog();
+                }
                 key_code_char!('?') => {
                     self.tx.send(AppEventType::OpenHelp);
                 }
@@ -177,6 +186,24 @@ impl ObjectPreviewPage {
                     state.handle_key_event(key);
                 }
             },
+            (ViewState::EncodingDialog, _) => match key {
+                key_code!(KeyCode::Esc) => {
+                    self.close_encoding_dialog();
+                }
+                key_code_char!('j') => {
+                    self.encoding_dialog_state.select_next();
+                }
+                key_code_char!('k') => {
+                    self.encoding_dialog_state.select_prev();
+                }
+                key_code!(KeyCode::Enter) => {
+                    self.apply_encoding();
+                }
+                key_code_char!('?') => {
+                    self.tx.send(AppEventType::OpenHelp);
+                }
+                _ => {}
+            },
         }
     }
 
@@ -209,6 +236,12 @@ impl ObjectPreviewPage {
             let (cursor_x, cursor_y) = state.cursor();
             f.set_cursor_position((cursor_x, cursor_y));
         }
+
+        if let ViewState::EncodingDialog = &mut self.view_state {
+            let encoding_dialog =
+                EncodingDialog::new(&self.encoding_dialog_state).theme(&self.ctx.theme);
+            f.render_widget(encoding_dialog, area);
+        }
     }
 
     pub fn helps(&self) -> Vec<String> {
@@ -236,6 +269,12 @@ impl ObjectPreviewPage {
                 (&["Esc"], "Close save dialog"),
                 (&["Enter"], "Download object"),
             ],
+            (ViewState::EncodingDialog, _) => &[
+                (&["Ctrl-c"], "Quit app"),
+                (&["Esc"], "Close encoding dialog"),
+                (&["j/k"], "Select item"),
+                (&["Enter"], "Reopen with encoding"),
+            ],
         };
 
         build_helps(helps)
@@ -262,6 +301,12 @@ impl ObjectPreviewPage {
                 (&["Enter"], "Download", 1),
                 (&["?"], "Help", 0),
             ],
+            (ViewState::EncodingDialog, _) => &[
+                (&["Esc"], "Close", 2),
+                (&["j/k"], "Select", 3),
+                (&["Enter"], "Encode", 1),
+                (&["?"], "Help", 0),
+            ],
         };
 
         build_short_helps(helps)
@@ -277,6 +322,32 @@ impl ObjectPreviewPage {
         self.view_state = ViewState::Default;
     }
 
+    fn open_encoding_dialog(&mut self) {
+        if let PreviewType::Text(_) = &mut self.preview_type {
+            self.view_state = ViewState::EncodingDialog;
+        }
+    }
+
+    fn close_encoding_dialog(&mut self) {
+        self.view_state = ViewState::Default;
+        self.encoding_dialog_state.reset();
+    }
+
+    fn apply_encoding(&mut self) {
+        if let ViewState::EncodingDialog = &self.view_state {
+            if let PreviewType::Text(state) = &mut self.preview_type {
+                state.set_encoding(self.encoding_dialog_state.selected());
+                state.update_lines(
+                    &self.file_detail,
+                    &self.object,
+                    self.ctx.config.preview.highlight,
+                    &self.ctx.config.preview.highlight_theme,
+                );
+            }
+        }
+        self.close_encoding_dialog();
+    }
+
     pub fn enable_image_render(&mut self) {
         if let PreviewType::Image(state) = &mut self.preview_type {
             state.set_render(true);

src/widget.rs

@@ -30,4 +30,4 @@ pub use sort_list_dialog::{
     ObjectListSortDialogState, ObjectListSortType,
 };
 pub use status::{Status, StatusType};
-pub use text_preview::{TextPreview, TextPreviewState};
+pub use text_preview::{EncodingDialog, EncodingDialogState, TextPreview, TextPreviewState};

src/widget/scroll_lines.rs

@@ -22,7 +22,7 @@ enum ScrollEvent {
     Left,
 }
 
-#[derive(Debug, Clone)]
+#[derive(Debug, Clone, Copy)]
 pub struct ScrollLinesOptions {
     pub number: bool,
     pub wrap: bool,
@@ -105,6 +105,10 @@ impl ScrollLinesState {
     pub fn toggle_number(&mut self) {
         self.options.number = !self.options.number;
     }
+
+    pub fn current_options(&self) -> ScrollLinesOptions {
+        self.options
+    }
 }
 
 #[derive(Debug, Default)]