fix: stabilize preview scroll initialization

README.md

@@ -19,20 +19,28 @@
 
 ```
 
- The revolution will be televised.
+ The revolution will (not) be televised.
 
 
 ## 📺 About
-`Television` is a blazingly fast general purpose fuzzy finder TUI written in Rust. It is inspired by the neovim `Telescope` plugin and the `fzf` command line tool. It is designed to be fast, efficient, easy to use and easily extensible. It is built on top of `tokio`, `ratatui` and the `nucleo` matcher which is used in the `helix` editor.
+`Television` is an extremely fast general purpose fuzzy finder TUI written in Rust. 
 
-## 📺 Design
+It is inspired by the neovim [telescope.nvim](https://github.com/nvim-telescope/telescope.nvim) plugin and the [fzf](https://github.com/junegunn/fzf) command line tool. It is designed to be fast, efficient, easy to use and easily extensible. It is built on top of [tokio](https://github.com/tokio-rs/tokio), [ratatui](https://github.com/ratatui/ratatui) and the *nucleo* matcher used in the [helix](https://github.com/helix-editor/helix) editor.
-`Television`'s design is based on the concept of `Channels`. A `Channel` is a source of data that can be used for fuzzy
-finding. A `Channel` can be anything from a file system directory, a git repository, a list of strings, a list of
-numbers, etc. `Television` provides a set of built-in `Channels` that can be used out of the box. However, `Television`
-is designed to be easily extensible and allows users to define their own custom `Channels` by implementing a simple
-trait.
 
-## Built-in Channels
+
+## 📺 Installation
+```bash
+cargo install television
+```
+
+## 📺 Usage
+```bash
+tv [channel] #[default: files] [possible values: env, files, git-repos, text, alias]
+```
+By default, `television` will search through files in the current directory.
+
+## 📺 Built-in Channels
+The following channels are currently available:
 - `Files`: search through files in a directory tree.
 - `Text`: search through textual content in a directory tree.
 - `GitRepos`: search through git repositories anywhere on the file system.
@@ -40,3 +48,27 @@ trait.
 - `Alias`: search through shell aliases and their values.
 - `Stdin`: search through lines of text from stdin.
 
+
+## 📺 Design
+#### Channels
+**Television**'s design is primarily based on the concept of **Channels**.
+
+A **Channel** is a source of data that can be used for fuzzy finding. It can be anything from a file system directory, a git repository, a list of strings, a list of numbers, etc. 
+
+**Television** provides a set of built-in **Channels** that can be used out of the box (see [Built-in Channels](#📺-built-in-channels)). The list of available channels
+will grow over time as new channels are implemented to satisfy different use cases. 
+
+Because a **Channel** is nothing more than a source of data that can respond to a user query, channels can virtually search through anything ranging from a local file system to a remote database, a list of environment variables, something passed through stdin, etc.
+
+#### Transitions
+When it makes sense, **Television** allows for transitions between different channels. For example, you might want to
+start searching through git repositories, then refine your search to a specific set of files in that shortlist of
+repositories and then finally search through the textual content of those files.
+
+This can easily be achieved using transitions.
+
+#### Previewers
+Entries returned by different channels can be previewed in a separate pane. This is useful when you want to see the
+contents of a file, the value of an environment variable, etc. Because entries returned by different channels may
+represent different types of data, **Television** allows for channels to declare the type of previewer that should be
+used. Television comes with a set of built-in previewers that can be used out of the box and will grow over time.

crates/television/television.rs

@@ -264,20 +264,20 @@ impl Television {
                         if new_pattern != self.current_pattern {
                             self.current_pattern.clone_from(&new_pattern);
                             self.find(&new_pattern);
-                            self.reset_preview_scroll();
                             self.reset_picker_selection();
+                            self.reset_preview_scroll();
                         }
                     }
                     _ => {}
                 }
             }
             Action::SelectNextEntry => {
-                self.select_next_entry();
                 self.reset_preview_scroll();
+                self.select_next_entry();
             }
             Action::SelectPrevEntry => {
-                self.select_prev_entry();
                 self.reset_preview_scroll();
+                self.select_prev_entry();
             }
             Action::ScrollPreviewDown => self.scroll_preview_down(1),
             Action::ScrollPreviewUp => self.scroll_preview_up(1),

crates/television/ui/preview.rs

@@ -1,3 +1,4 @@
+use crate::channels::OnAir;
 use crate::entry::Entry;
 use crate::previewers::{
     Preview, PreviewContent, FILE_TOO_LARGE_MSG, PREVIEW_NOT_SUPPORTED_MSG,
@@ -216,7 +217,7 @@ impl Television {
         target_line: Option<u16>,
         height: u16,
     ) {
-        if self.preview_scroll.is_none() {
+        if self.preview_scroll.is_none() && !self.channel.running() {
             self.preview_scroll =
                 Some(target_line.unwrap_or(0).saturating_sub(height / 3));
         }