wip: checkpoint

benches/main/ui.rs

@@ -8,12 +8,12 @@ use ratatui::prelude::{Line, Style};
 use ratatui::style::Color;
 use ratatui::widgets::{Block, BorderType, Borders, ListDirection, Padding};
 use ratatui::Terminal;
+use television::channels::cable::prototypes::CableChannelPrototypes;
 use television::{
     action::Action,
     channels::{
         cable::prototypes::CableChannelPrototype,
         entry::{into_ranges, Entry},
-        preview::PreviewType,
         OnAir, TelevisionChannel,
     },
     config::{Config, ConfigEnv},
@@ -37,7 +37,6 @@ pub fn draw_results_list(c: &mut Criterion) {
                 color: "#7e8e91",
             }),
             line_number: None,
-            preview_type: PreviewType::Files,
         },
         Entry {
             name: "typeshed/README.md".to_string(),
@@ -49,7 +48,6 @@ pub fn draw_results_list(c: &mut Criterion) {
                 color: "#dddddd",
             }),
             line_number: None,
-            preview_type: PreviewType::Files,
         },
         Entry {
             name: "typeshed/stdlib/re.pyi".to_string(),
@@ -61,7 +59,6 @@ pub fn draw_results_list(c: &mut Criterion) {
                 color: "#ffbc03",
             }),
             line_number: None,
-            preview_type: PreviewType::Files,
         },
         Entry {
             name: "typeshed/stdlib/io.pyi".to_string(),
@@ -73,7 +70,6 @@ pub fn draw_results_list(c: &mut Criterion) {
                 color: "#ffbc03",
             }),
             line_number: None,
-            preview_type: PreviewType::Files,
         },
         Entry {
             name: "typeshed/stdlib/gc.pyi".to_string(),
@@ -85,7 +81,6 @@ pub fn draw_results_list(c: &mut Criterion) {
                 color: "#ffbc03",
             }),
             line_number: None,
-            preview_type: PreviewType::Files,
         },
         Entry {
             name: "typeshed/stdlib/uu.pyi".to_string(),
@@ -97,7 +92,6 @@ pub fn draw_results_list(c: &mut Criterion) {
                 color: "#ffbc03",
             }),
             line_number: None,
-            preview_type: PreviewType::Files,
         },
         Entry {
             name: "typeshed/stdlib/nt.pyi".to_string(),
@@ -109,7 +103,6 @@ pub fn draw_results_list(c: &mut Criterion) {
                 color: "#ffbc03",
             }),
             line_number: None,
-            preview_type: PreviewType::Files,
         },
         Entry {
             name: "typeshed/stdlib/dis.pyi".to_string(),
@@ -121,7 +114,6 @@ pub fn draw_results_list(c: &mut Criterion) {
                 color: "#ffbc03",
             }),
             line_number: None,
-            preview_type: PreviewType::Files,
         },
         Entry {
             name: "typeshed/stdlib/imp.pyi".to_string(),
@@ -133,7 +125,6 @@ pub fn draw_results_list(c: &mut Criterion) {
                 color: "#ffbc03",
             }),
             line_number: None,
-            preview_type: PreviewType::Files,
         },
         Entry {
             name: "typeshed/stdlib/bdb.pyi".to_string(),
@@ -145,7 +136,6 @@ pub fn draw_results_list(c: &mut Criterion) {
                 color: "#ffbc03",
             }),
             line_number: None,
-            preview_type: PreviewType::Files,
         },
         Entry {
             name: "typeshed/stdlib/abc.pyi".to_string(),
@@ -157,7 +147,6 @@ pub fn draw_results_list(c: &mut Criterion) {
                 color: "#ffbc03",
             }),
             line_number: None,
-            preview_type: PreviewType::Files,
         },
         Entry {
             name: "typeshed/stdlib/cgi.pyi".to_string(),
@@ -169,7 +158,6 @@ pub fn draw_results_list(c: &mut Criterion) {
                 color: "#ffbc03",
             }),
             line_number: None,
-            preview_type: PreviewType::Files,
         },
         Entry {
             name: "typeshed/stdlib/bz2.pyi".to_string(),
@@ -181,7 +169,6 @@ pub fn draw_results_list(c: &mut Criterion) {
                 color: "#ffbc03",
             }),
             line_number: None,
-            preview_type: PreviewType::Files,
         },
         Entry {
             name: "typeshed/stdlib/grp.pyi".to_string(),
@@ -193,7 +180,6 @@ pub fn draw_results_list(c: &mut Criterion) {
                 color: "#ffbc03",
             }),
             line_number: None,
-            preview_type: PreviewType::Files,
         },
         Entry {
             name: "typeshed/stdlib/ast.pyi".to_string(),
@@ -205,7 +191,6 @@ pub fn draw_results_list(c: &mut Criterion) {
                 color: "#ffbc03",
             }),
             line_number: None,
-            preview_type: PreviewType::Files,
         },
         Entry {
             name: "typeshed/stdlib/csv.pyi".to_string(),
@@ -217,7 +202,6 @@ pub fn draw_results_list(c: &mut Criterion) {
                 color: "#ffbc03",
             }),
             line_number: None,
-            preview_type: PreviewType::Files,
         },
         Entry {
             name: "typeshed/stdlib/pdb.pyi".to_string(),
@@ -229,7 +213,6 @@ pub fn draw_results_list(c: &mut Criterion) {
                 color: "#ffbc03",
             }),
             line_number: None,
-            preview_type: PreviewType::Files,
         },
         Entry {
             name: "typeshed/stdlib/pwd.pyi".to_string(),
@@ -241,7 +224,6 @@ pub fn draw_results_list(c: &mut Criterion) {
                 color: "#ffbc03",
             }),
             line_number: None,
-            preview_type: PreviewType::Files,
         },
         Entry {
             name: "typeshed/stdlib/ssl.pyi".to_string(),
@@ -253,7 +235,6 @@ pub fn draw_results_list(c: &mut Criterion) {
                 color: "#ffbc03",
             }),
             line_number: None,
-            preview_type: PreviewType::Files,
         },
         Entry {
             name: "typeshed/stdlib/tty.pyi".to_string(),
@@ -265,7 +246,6 @@ pub fn draw_results_list(c: &mut Criterion) {
                 color: "#ffbc03",
             }),
             line_number: None,
-            preview_type: PreviewType::Files,
         },
         Entry {
             name: "typeshed/stdlib/nis.pyi".to_string(),
@@ -277,7 +257,6 @@ pub fn draw_results_list(c: &mut Criterion) {
                 color: "#ffbc03",
             }),
             line_number: None,
-            preview_type: PreviewType::Files,
         },
         Entry {
             name: "typeshed/stdlib/pty.pyi".to_string(),
@@ -289,7 +268,6 @@ pub fn draw_results_list(c: &mut Criterion) {
                 color: "#ffbc03",
             }),
             line_number: None,
-            preview_type: PreviewType::Files,
         },
         Entry {
             name: "typeshed/stdlib/cmd.pyi".to_string(),
@@ -301,7 +279,6 @@ pub fn draw_results_list(c: &mut Criterion) {
                 color: "#ffbc03",
             }),
             line_number: None,
-            preview_type: PreviewType::Files,
         },
         Entry {
             name: "typeshed/tests/utils.py".to_string(),
@@ -313,7 +290,6 @@ pub fn draw_results_list(c: &mut Criterion) {
                 color: "#ffbc03",
             }),
             line_number: None,
-            preview_type: PreviewType::Files,
         },
         Entry {
             name: "typeshed/pyproject.toml".to_string(),
@@ -325,7 +301,6 @@ pub fn draw_results_list(c: &mut Criterion) {
                 color: "#9c4221",
             }),
             line_number: None,
-            preview_type: PreviewType::Files,
         },
         Entry {
             name: "typeshed/MAINTAINERS.md".to_string(),
@@ -337,7 +312,6 @@ pub fn draw_results_list(c: &mut Criterion) {
                 color: "#dddddd",
             }),
             line_number: None,
-            preview_type: PreviewType::Files,
         },
         Entry {
             name: "typeshed/stdlib/enum.pyi".to_string(),
@@ -349,7 +323,6 @@ pub fn draw_results_list(c: &mut Criterion) {
                 color: "#ffbc03",
             }),
             line_number: None,
-            preview_type: PreviewType::Files,
         },
         Entry {
             name: "typeshed/stdlib/hmac.pyi".to_string(),
@@ -361,7 +334,6 @@ pub fn draw_results_list(c: &mut Criterion) {
                 color: "#ffbc03",
             }),
             line_number: None,
-            preview_type: PreviewType::Files,
         },
         Entry {
             name: "typeshed/stdlib/uuid.pyi".to_string(),
@@ -373,7 +345,6 @@ pub fn draw_results_list(c: &mut Criterion) {
                 color: "#ffbc03",
             }),
             line_number: None,
-            preview_type: PreviewType::Files,
         },
         Entry {
             name: "typeshed/stdlib/glob.pyi".to_string(),
@@ -385,7 +356,6 @@ pub fn draw_results_list(c: &mut Criterion) {
                 color: "#ffbc03",
             }),
             line_number: None,
-            preview_type: PreviewType::Files,
         },
         Entry {
             name: "typeshed/stdlib/_ast.pyi".to_string(),
@@ -397,7 +367,6 @@ pub fn draw_results_list(c: &mut Criterion) {
                 color: "#ffbc03",
             }),
             line_number: None,
-            preview_type: PreviewType::Files,
         },
         Entry {
             name: "typeshed/stdlib/_csv.pyi".to_string(),
@@ -409,7 +378,6 @@ pub fn draw_results_list(c: &mut Criterion) {
                 color: "#ffbc03",
             }),
             line_number: None,
-            preview_type: PreviewType::Files,
         },
         Entry {
             name: "typeshed/stdlib/code.pyi".to_string(),
@@ -421,7 +389,6 @@ pub fn draw_results_list(c: &mut Criterion) {
                 color: "#ffbc03",
             }),
             line_number: None,
-            preview_type: PreviewType::Files,
         },
         Entry {
             name: "typeshed/stdlib/spwd.pyi".to_string(),
@@ -433,7 +400,6 @@ pub fn draw_results_list(c: &mut Criterion) {
                 color: "#ffbc03",
             }),
             line_number: None,
-            preview_type: PreviewType::Files,
         },
         Entry {
             name: "typeshed/stdlib/_msi.pyi".to_string(),
@@ -445,7 +411,6 @@ pub fn draw_results_list(c: &mut Criterion) {
                 color: "#ffbc03",
             }),
             line_number: None,
-            preview_type: PreviewType::Files,
         },
         Entry {
             name: "typeshed/stdlib/time.pyi".to_string(),
@@ -456,7 +421,6 @@ pub fn draw_results_list(c: &mut Criterion) {
                 color: "#ffbc03",
             }),
             line_number: None,
-            preview_type: PreviewType::Files,
             name_match_ranges: Some(into_ranges(&[0, 1, 2, 3])),
             value_match_ranges: None,
         },
@@ -514,7 +478,14 @@ pub fn draw(c: &mut Criterion) {
                 channel.find("television");
                 // Wait for the channel to finish loading
                 let mut tv = Television::new(
-                    tx, channel, config, None, false, false, false,
+                    tx,
+                    channel,
+                    config,
+                    None,
+                    false,
+                    false,
+                    false,
+                    CableChannelPrototypes::default(),
                 );
                 for _ in 0..5 {
                     // tick the matcher

television/app.rs

@@ -4,6 +4,7 @@ use anyhow::Result;
 use tokio::sync::mpsc;
 use tracing::{debug, trace};
 
+use crate::channels::cable::prototypes::CableChannelPrototypes;
 use crate::channels::{entry::Entry, OnAir, TelevisionChannel};
 use crate::config::{default_tick_rate, Config};
 use crate::keymap::Keymap;
@@ -96,6 +97,8 @@ pub struct App {
     /// Render task handle
     render_task: Option<tokio::task::JoinHandle<Result<()>>>,
     options: AppOptions,
+    /// The cable channels that are available.
+    cable_channels: CableChannelPrototypes,
 }
 
 /// The outcome of an action.
@@ -139,6 +142,7 @@ impl App {
         config: Config,
         input: Option<String>,
         options: AppOptions,
+        cable_channels: CableChannelPrototypes,
     ) -> Self {
         let (action_tx, action_rx) = mpsc::unbounded_channel();
         let (render_tx, render_rx) = mpsc::unbounded_channel();
@@ -156,6 +160,7 @@ impl App {
             options.no_remote,
             options.no_help,
             options.exact,
+            CableChannelPrototypes(cable_channels.clone()),
         );
 
         Self {
@@ -173,6 +178,7 @@ impl App {
             ui_state_tx,
             render_task: None,
             options,
+            cable_channels,
         }
     }
 
@@ -198,7 +204,7 @@ impl App {
         // Event loop
         if !headless {
             debug!("Starting backend event loop");
-            let event_loop = EventLoop::new(self.options.tick_rate, true);
+            let event_loop = EventLoop::new(self.options.tick_rate);
             self.event_rx = event_loop.rx;
             self.event_abort_tx = event_loop.abort_tx;
         }
@@ -437,15 +443,18 @@ impl App {
 #[cfg(test)]
 mod test {
     use super::*;
-    use crate::channels::stdin::Channel as StdinChannel;
+    use crate::channels::cable::Channel as CableChannel;
 
     #[test]
     fn test_maybe_select_1() {
         let mut app = App::new(
-            TelevisionChannel::Stdin(StdinChannel::new(None)),
+            TelevisionChannel::Cable(CableChannel::new(
+                "random", "cat", false, None,
+            )),
             Config::default(),
             None,
             AppOptions::default(),
+            CableChannelPrototypes::default(),
         );
         app.television
             .results_picker

television/cable.rs

@@ -6,7 +6,9 @@ use anyhow::Result;
 use tracing::{debug, error};
 
 use crate::{
-    channels::cable::prototypes::{CableChannelPrototype, CableChannels},
+    channels::cable::prototypes::{
+        CableChannelPrototype, CableChannelPrototypes,
+    },
     config::get_config_dir,
 };
 
@@ -40,7 +42,7 @@ const DEFAULT_CABLE_CHANNELS: &str =
 ///   ├── my_channels.toml
 ///   └── windows_channels.toml
 /// ```
-pub fn load_cable_channels() -> Result<CableChannels> {
+pub fn load_cable_channels() -> Result<CableChannelPrototypes> {
     let config_dir = get_config_dir();
 
     // list all files in the config directory
@@ -95,7 +97,7 @@ pub fn load_cable_channels() -> Result<CableChannels> {
     {
         cable_channels.insert(prototype.name.clone(), prototype);
     }
-    Ok(CableChannels(cable_channels))
+    Ok(CableChannelPrototypes(cable_channels))
 }
 
 fn is_cable_file_format<P>(p: P) -> bool

television/channels/cable.rs

@@ -18,7 +18,7 @@ pub struct Channel {
     pub name: String,
     matcher: Matcher<String>,
     entries_command: String,
-    preview_command: Option<PreviewCommand>,
+    pub preview_command: Option<PreviewCommand>,
     selected_entries: FxHashSet<Entry>,
     crawl_handle: tokio::task::JoinHandle<()>,
 }
@@ -29,7 +29,7 @@ impl Default for Channel {
             "files",
             "find . -type f",
             false,
-            Some(PreviewCommand::new("cat {}", ":")),
+            Some(PreviewCommand::new("cat {}", ":", None)),
         )
     }
 }
@@ -46,6 +46,7 @@ impl From<CableChannelPrototype> for Channel {
                     &prototype
                         .preview_delimiter
                         .unwrap_or(DEFAULT_DELIMITER.to_string()),
+                    prototype.preview_offset,
                 )),
                 None => None,
             },

television/channels/cable/prototypes.rs

@@ -106,9 +106,11 @@ impl Display for CableChannelPrototype {
 /// in a way that facilitates answering questions like "what's the prototype
 /// for `files`?" or "does this channel exist?".
 #[derive(Debug, serde::Deserialize)]
-pub struct CableChannels(pub FxHashMap<String, CableChannelPrototype>);
+pub struct CableChannelPrototypes(
+    pub FxHashMap<String, CableChannelPrototype>,
+);
 
-impl Deref for CableChannels {
+impl Deref for CableChannelPrototypes {
     type Target = FxHashMap<String, CableChannelPrototype>;
 
     fn deref(&self) -> &Self::Target {
@@ -127,18 +129,18 @@ const DEFAULT_CABLE_CHANNELS_FILE: &str =
 const DEFAULT_CABLE_CHANNELS_FILE: &str =
     include_str!("../../cable/windows-channels.toml");
 
-impl Default for CableChannels {
+impl Default for CableChannelPrototypes {
     /// Fallback to the default cable channels specification (the template file
     /// included in the repo).
     fn default() -> Self {
-        let pts = toml::from_str::<SerializedChannelPrototypes>(
+        let s = toml::from_str::<SerializedChannelPrototypes>(
             DEFAULT_CABLE_CHANNELS_FILE,
         )
         .expect("Unable to parse default cable channels");
-        let mut channels = FxHashMap::default();
+        let mut prototypes = FxHashMap::default();
-        for prototype in pts.prototypes {
+        for prototype in s.prototypes {
-            channels.insert(prototype.name.clone(), prototype);
+            prototypes.insert(prototype.name.clone(), prototype);
         }
-        CableChannels(channels)
+        CableChannelPrototypes(prototypes)
     }
 }

television/channels/mod.rs

@@ -7,7 +7,7 @@ pub mod cable;
 pub mod entry;
 pub mod preview;
 pub mod remote_control;
-pub mod stdin;
+// pub mod stdin;
 
 /// The interface that all television channels must implement.
 ///
@@ -118,7 +118,7 @@ pub enum TelevisionChannel {
     /// The standard input channel.
     ///
     /// This channel allows to search through whatever is passed through stdin.
-    Stdin(stdin::Channel),
+    // Stdin(stdin::Channel),
     /// The remote control channel.
     ///
     /// This channel allows to switch between different channels.
@@ -142,7 +142,7 @@ impl TelevisionChannel {
     pub fn name(&self) -> String {
         match self {
             TelevisionChannel::Cable(channel) => channel.name.clone(),
-            TelevisionChannel::Stdin(_) => String::from("Stdin"),
+            // TelevisionChannel::Stdin(_) => String::from("Stdin"),
             TelevisionChannel::RemoteControl(_) => String::from("Remote"),
         }
     }

television/channels/preview.rs

@@ -1,8 +1,8 @@
 use std::fmt::Display;
 
-use lazy_regex::{regex, Lazy, Regex};
-
 use super::entry::Entry;
+use crate::channels::cable::prototypes::CableChannelPrototype;
+use lazy_regex::{regex, Lazy, Regex};
 
 static CMD_RE: &Lazy<Regex> = regex!(r"\{(\d+)\}");
 
@@ -10,13 +10,19 @@ static CMD_RE: &Lazy<Regex> = regex!(r"\{(\d+)\}");
 pub struct PreviewCommand {
     pub command: String,
     pub delimiter: String,
+    pub offset_expr: Option<String>,
 }
 
 impl PreviewCommand {
-    pub fn new(command: &str, delimiter: &str) -> Self {
+    pub fn new(
+        command: &str,
+        delimiter: &str,
+        offset_expr: Option<String>,
+    ) -> Self {
         Self {
             command: command.to_string(),
             delimiter: delimiter.to_string(),
+            offset_expr,
         }
     }
 
@@ -29,6 +35,7 @@ impl PreviewCommand {
     /// let command = PreviewCommand {
     ///     command: "something {} {2} {0}".to_string(),
     ///     delimiter: ":".to_string(),
+    ///     offset_expr: None,
     /// };
     /// let entry = Entry::new("a:given:entry:to:preview".to_string());
     ///
@@ -55,6 +62,29 @@ impl PreviewCommand {
     }
 }
 
+impl TryFrom<&CableChannelPrototype> for PreviewCommand {
+    type Error = anyhow::Error;
+
+    fn try_from(value: &CableChannelPrototype) -> Result<Self, Self::Error> {
+        let command = value
+            .preview_command
+            .as_ref()
+            .expect("Preview command is not set.");
+
+        let delimiter = value
+            .preview_delimiter
+            .as_ref()
+            .expect("Preview delimiter is not set");
+
+        let offset_expr = value.preview_offset.clone();
+
+        // FIXME: handle offset here (side note: we don't want to reparse the offset
+        // expression for each entry, so maybe just parse it once and try to store it
+        // as some sort of function we can call later on
+        Ok(PreviewCommand::new(command, delimiter, offset_expr))
+    }
+}
+
 impl Display for PreviewCommand {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         write!(f, "{self:?}")
@@ -71,6 +101,7 @@ mod tests {
         let command = PreviewCommand {
             command: "something {} {2} {0}".to_string(),
             delimiter: ":".to_string(),
+            offset_expr: None,
         };
         let entry = Entry::new("an:entry:to:preview".to_string());
         let formatted_command = command.format_with(&entry);
@@ -86,6 +117,7 @@ mod tests {
         let command = PreviewCommand {
             command: "something".to_string(),
             delimiter: ":".to_string(),
+            offset_expr: None,
         };
         let entry = Entry::new("an:entry:to:preview".to_string());
         let formatted_command = command.format_with(&entry);
@@ -98,6 +130,7 @@ mod tests {
         let command = PreviewCommand {
             command: "something {}".to_string(),
             delimiter: ":".to_string(),
+            offset_expr: None,
         };
         let entry = Entry::new("an:entry:to:preview".to_string());
         let formatted_command = command.format_with(&entry);
@@ -110,6 +143,7 @@ mod tests {
         let command = PreviewCommand {
             command: "something {0} -t {2}".to_string(),
             delimiter: ":".to_string(),
+            offset_expr: None,
         };
         let entry = Entry::new("an:entry:to:preview".to_string());
         let formatted_command = command.format_with(&entry);

television/channels/remote_control.rs

@@ -1,6 +1,6 @@
 use std::collections::HashSet;
 
-use crate::channels::cable::prototypes::CableChannels;
+use crate::channels::cable::prototypes::CableChannelPrototypes;
 use crate::channels::entry::Entry;
 use crate::channels::{OnAir, TelevisionChannel};
 use crate::matcher::{config::Config, Matcher};
@@ -12,19 +12,19 @@ use super::cable;
 
 pub struct RemoteControl {
     matcher: Matcher<String>,
-    cable_channels: Option<CableChannels>,
+    cable_channels: Option<CableChannelPrototypes>,
     selected_entries: FxHashSet<Entry>,
 }
 
 const NUM_THREADS: usize = 1;
 
 impl RemoteControl {
-    pub fn new(cable_channels: Option<CableChannels>) -> Self {
+    pub fn new(cable_channels: Option<CableChannelPrototypes>) -> Self {
         let matcher = Matcher::new(Config::default().n_threads(NUM_THREADS));
         let injector = matcher.injector();
         for c in cable_channels
             .as_ref()
-            .unwrap_or(&CableChannels::default())
+            .unwrap_or(&CableChannelPrototypes::default())
             .keys()
         {
             let () = injector.push(c.clone(), |e, cols| {

television/channels/stdin.rs

@@ -13,7 +13,7 @@ use crate::matcher::{config::Config, injector::Injector, Matcher};
 
 pub struct Channel {
     matcher: Matcher<String>,
-    preview_command: Option<PreviewCommand>,
+    pub preview_command: Option<PreviewCommand>,
     selected_entries: FxHashSet<Entry>,
     instream_handle: std::thread::JoinHandle<()>,
 }

television/cli/mod.rs

@@ -5,7 +5,7 @@ use anyhow::{anyhow, Result};
 use tracing::debug;
 
 use crate::channels::cable::prototypes::{
-    CableChannelPrototype, CableChannels,
+    CableChannelPrototype, CableChannelPrototypes,
 };
 use crate::channels::preview::PreviewCommand;
 use crate::cli::args::{Cli, Command};
@@ -76,6 +76,8 @@ impl From<Cli> for PostProcessedCli {
         let preview_command = cli.preview.map(|preview| PreviewCommand {
             command: preview,
             delimiter: cli.delimiter.clone(),
+            // TODO: add the --preview-offset option to the CLI
+            offset_expr: None,
         });
 
         let channel: CableChannelPrototype;
@@ -170,7 +172,7 @@ fn parse_keybindings_literal(
 
 pub fn parse_channel(
     channel: &str,
-    cable_channels: &CableChannels,
+    cable_channels: &CableChannelPrototypes,
 ) -> Result<CableChannelPrototype> {
     // try to parse the channel as a cable channel
     match cable_channels
@@ -215,7 +217,7 @@ pub fn guess_channel_from_prompt(
     prompt: &str,
     command_mapping: &FxHashMap<String, String>,
     fallback_channel: &str,
-    cable_channels: &CableChannels,
+    cable_channels: &CableChannelPrototypes,
 ) -> Result<CableChannelPrototype> {
     debug!("Guessing channel from prompt: {}", prompt);
     // git checkout -qf
@@ -317,7 +319,8 @@ mod tests {
             post_processed_cli.preview_command,
             Some(PreviewCommand {
                 command: "bat -n --color=always {}".to_string(),
-                delimiter: ":".to_string()
+                delimiter: ":".to_string(),
+                offset_expr: None,
             })
         );
         assert_eq!(post_processed_cli.tick_rate, None);
@@ -377,7 +380,7 @@ mod tests {
 
     /// Returns a tuple containing a command mapping and a fallback channel.
     fn guess_channel_from_prompt_setup<'a>(
-    ) -> (FxHashMap<String, String>, &'a str, CableChannels) {
+    ) -> (FxHashMap<String, String>, &'a str, CableChannelPrototypes) {
         let mut command_mapping = FxHashMap::default();
         command_mapping.insert("vim".to_string(), "files".to_string());
         command_mapping.insert("export".to_string(), "env".to_string());

television/event.rs

@@ -115,9 +115,7 @@ impl Display for Key {
 #[allow(clippy::module_name_repetitions)]
 pub struct EventLoop {
     pub rx: mpsc::UnboundedReceiver<Event<Key>>,
-    //tx: mpsc::UnboundedSender<Event<Key>>,
     pub abort_tx: mpsc::UnboundedSender<()>,
-    //tick_rate: std::time::Duration,
 }
 
 struct PollFuture {
@@ -162,8 +160,7 @@ fn flush_existing_events() {
 }
 
 impl EventLoop {
-    // FIXME: this init parameter doesn't seem to be used anymore
+    pub fn new(tick_rate: f64) -> Self {
-    pub fn new(tick_rate: f64, init: bool) -> Self {
         let (tx, rx) = mpsc::unbounded_channel();
         let tick_interval = Duration::from_secs_f64(1.0 / tick_rate);
 
@@ -171,8 +168,6 @@ impl EventLoop {
 
         flush_existing_events();
 
-        if init {
-            //let mut reader = crossterm::event::EventStream::new();
         tokio::spawn(async move {
             loop {
                 let delay = tokio::time::sleep(tick_interval);
@@ -219,7 +214,6 @@ impl EventLoop {
                 }
             }
         });
-        }
 
         Self {
             //tx,

television/main.rs

@@ -7,7 +7,9 @@ use anyhow::Result;
 use clap::Parser;
 use crossterm::terminal::enable_raw_mode;
 use television::cable;
-use television::channels::cable::prototypes::CableChannels;
+use television::channels::cable::prototypes::{
+    CableChannelPrototype, CableChannelPrototypes,
+};
 use television::utils::clipboard::CLIPBOARD;
 use tracing::{debug, error, info};
 
@@ -81,7 +83,8 @@ async fn main() -> Result<()> {
         args.no_help,
         config.application.tick_rate,
     );
-    let mut app = App::new(channel, config, args.input, options);
+    let mut app =
+        App::new(channel, config, args.input, options, cable_channels);
     stdout().flush()?;
     debug!("Running application...");
     let output = app.run(stdout().is_terminal(), false).await?;
@@ -157,8 +160,8 @@ pub fn determine_channel(
     args: PostProcessedCli,
     config: &Config,
     readable_stdin: bool,
-    cable_channels: &CableChannels,
+    cable_channels: &CableChannelPrototypes,
-) -> Result<TelevisionChannel> {
+) -> Result<CableChannelPrototype> {
     if readable_stdin {
         debug!("Using stdin channel");
         Ok(TelevisionChannel::Stdin(StdinChannel::new(
@@ -197,9 +200,9 @@ mod tests {
         config: &Config,
         readable_stdin: bool,
         expected_channel: &TelevisionChannel,
-        cable_channels: Option<CableChannels>,
+        cable_channels: Option<CableChannelPrototypes>,
     ) {
-        let channels: CableChannels = cable_channels
+        let channels: CableChannelPrototypes = cable_channels
             .unwrap_or_else(|| load_cable_channels().unwrap_or_default());
         let channel =
             determine_channel(args.clone(), config, readable_stdin, &channels)

television/television.rs

@@ -1,21 +1,29 @@
-use crate::action::Action;
+use crate::{
-use crate::cable::load_cable_channels;
+    action::Action,
-use crate::channels::entry::{Entry, ENTRY_PLACEHOLDER};
+    cable::load_cable_channels,
-use crate::channels::{
+    channels::{
-    remote_control::RemoteControl, OnAir, TelevisionChannel,
+        cable::{prototypes::CableChannelPrototypes, Channel as CableChannel},
+        entry::{Entry, ENTRY_PLACEHOLDER},
+        remote_control::RemoteControl,
+        // stdin::Channel as StdinChannel,
+        OnAir,
+        TelevisionChannel,
+    },
+    config::{Config, Theme},
+    draw::{ChannelState, Ctx, TvState},
+    input::convert_action_to_input_request,
+    picker::Picker,
+    preview::{previewer::Previewer, Preview, PreviewState},
+    render::UiState,
+    screen::{
+        colors::Colorscheme,
+        layout::InputPosition,
+        spinner::{Spinner, SpinnerState},
+    },
+    utils::{
+        clipboard::CLIPBOARD, metadata::AppMetadata, strings::EMPTY_STRING,
+    },
 };
-use crate::config::{Config, Theme};
-use crate::draw::{ChannelState, Ctx, TvState};
-use crate::input::convert_action_to_input_request;
-use crate::picker::Picker;
-use crate::preview::{previewer::Previewer, Preview, PreviewState};
-use crate::render::UiState;
-use crate::screen::colors::Colorscheme;
-use crate::screen::layout::InputPosition;
-use crate::screen::spinner::{Spinner, SpinnerState};
-use crate::utils::clipboard::CLIPBOARD;
-use crate::utils::metadata::AppMetadata;
-use crate::utils::strings::EMPTY_STRING;
 use anyhow::Result;
 use rustc_hash::{FxBuildHasher, FxHashSet};
 use serde::{Deserialize, Serialize};
@@ -45,7 +53,7 @@ pub struct Television {
     pub matching_mode: MatchingMode,
     pub results_picker: Picker,
     pub rc_picker: Picker,
-    pub previewer: Previewer,
+    pub previewer: Option<Previewer>,
     pub preview_state: PreviewState,
     pub spinner: Spinner,
     pub spinner_state: SpinnerState,
@@ -66,14 +74,24 @@ impl Television {
         no_remote: bool,
         no_help: bool,
         exact: bool,
+        cable_channels: CableChannelPrototypes,
     ) -> Self {
         let mut results_picker = Picker::new(input.clone());
         if config.ui.input_bar_position == InputPosition::Bottom {
             results_picker = results_picker.inverted();
         }
-        // FIXME: fix this
+
-        let previewer = Previewer::new();
+        let previewer = match &channel {
-        let cable_channels = load_cable_channels().unwrap_or_default();
+            // TelevisionChannel::Stdin(StdinChannel {
+            //     preview_command: command,
+            //     ..
+            // }) |
+            TelevisionChannel::Cable(CableChannel {
+                preview_command: command,
+                ..
+            }) => command.clone().map(Previewer::new),
+            _ => None,
+        };
 
         let app_metadata = AppMetadata::new(
             env!("CARGO_PKG_VERSION").to_string(),
@@ -369,10 +387,14 @@ impl Television {
         &mut self,
         selected_entry: &Entry,
     ) -> Result<()> {
-        if self.config.ui.show_preview_panel && self.channel.supports_preview()
+        if self.config.ui.show_preview_panel
+            && self.channel.supports_preview()
+            && self.previewer.is_some()
         {
             // preview content
-            if let Some(preview) = self.previewer.preview(selected_entry) {
+            if let Some(preview) =
+                self.previewer.as_mut().unwrap().preview(selected_entry)
+            {
                 // only update if the preview content has changed
                 if self.preview_state.preview.title != preview.title {
                     self.preview_state.update(