refactor previewing code

 - event.rs is moved out of utils as its an integral part of the codebase
 - load_child.rs has been replaced with preview module
 - moved previewing logic inside run.rs instead of spreading it across multiple
 commands

5 files changed, 164 insertions, 18 deletions

diff --git a/src/preview/mod.rs b/src/preview/mod.rs
index 6a3e7fd..ebab23f 100644
--- a/src/preview/mod.rs
+++ b/src/preview/mod.rs
@@ -1,3 +1,3 @@
-pub mod preview_sh;
-
-pub use self::preview_sh::preview_with_script;
+pub mod preview_default;
+pub mod preview_dir;
+pub mod preview_file;
diff --git a/src/preview/preview_default.rs b/src/preview/preview_default.rs
new file mode 100644
index 0000000..9601800
--- /dev/null
+++ b/src/preview/preview_default.rs
@@ -0,0 +1,27 @@
+use std::path;
+
+use crate::context::AppContext;
+use crate::preview::{preview_dir, preview_file};
+use crate::ui::TuiBackend;
+
+pub fn load_preview_path(context: &mut AppContext, backend: &mut TuiBackend, p: path::PathBuf) {
+    if p.is_dir() {
+        preview_dir::load_preview(context, p);
+    } else if p.is_file() {
+        preview_file::preview_path_with_script(context, backend, p);
+    }
+}
+
+pub fn load_preview(context: &mut AppContext, backend: &mut TuiBackend) {
+    let mut p: Option<path::PathBuf> = None;
+    if let Some(curr_list) = context.tab_context_ref().curr_tab_ref().curr_list_ref() {
+        if let Some(index) = curr_list.index {
+            let entry = &curr_list.contents[index];
+            p = Some(entry.file_path().to_path_buf())
+        }
+    }
+
+    if let Some(p) = p {
+        load_preview_path(context, backend, p);
+    }
+}
diff --git a/src/preview/preview_dir.rs b/src/preview/preview_dir.rs
new file mode 100644
index 0000000..bf1d151
--- /dev/null
+++ b/src/preview/preview_dir.rs
@@ -0,0 +1,48 @@
+use std::io;
+use std::path;
+use std::thread;
+
+use crate::context::AppContext;
+use crate::event::AppEvent;
+use crate::history::DirectoryHistory;
+
+pub fn load_preview(context: &mut AppContext, p: path::PathBuf) -> io::Result<path::PathBuf> {
+    // get preview
+    let options = context.config_ref().display_options_ref().clone();
+    context
+        .tab_context_mut()
+        .curr_tab_mut()
+        .history_mut()
+        .create_or_soft_update(p.as_path(), &options)?;
+    Ok(p)
+}
+
+pub struct CursorDir {}
+
+impl CursorDir {
+    pub fn load(context: &mut AppContext) -> io::Result<()> {
+        let mut p: Option<path::PathBuf> = None;
+        if let Some(curr_list) = context.tab_context_ref().curr_tab_ref().curr_list_ref() {
+            if let Some(index) = curr_list.index {
+                let entry = &curr_list.contents[index];
+                p = Some(entry.file_path().to_path_buf())
+            }
+        }
+
+        let res = match p {
+            Some(p) if p.is_dir() => load_preview(context, p),
+            Some(p) => Err(io::Error::new(
+                io::ErrorKind::InvalidData,
+                "Not a directory".to_string(),
+            )),
+            None => Err(io::Error::new(
+                io::ErrorKind::NotFound,
+                "No such file or directory".to_string(),
+            )),
+        };
+        match res {
+            Ok(_) => Ok(()),
+            Err(e) => Err(e),
+        }
+    }
+}
diff --git a/src/preview/preview_file.rs b/src/preview/preview_file.rs
new file mode 100644
index 0000000..5aabb13
--- /dev/null
+++ b/src/preview/preview_file.rs
@@ -0,0 +1,86 @@
+use std::io;
+use std::path;
+use std::process::{Command, Output};
+
+use tui::layout::{Constraint, Direction, Layout, Rect};
+use tui::widgets::{Block, Borders};
+
+use crate::context::AppContext;
+use crate::ui::TuiBackend;
+
+pub fn preview_path_with_script(
+    context: &AppContext,
+    backend: &mut TuiBackend,
+    p: path::PathBuf,
+) -> io::Result<Output> {
+    let preview_options = context.config_ref().preview_options_ref();
+    let config = context.config_ref();
+
+    match preview_options.preview_script.as_ref() {
+        None => Err(io::Error::new(
+            io::ErrorKind::Other,
+            "No preview script specified",
+        )),
+        Some(script) => {
+            let area = backend.terminal.as_ref().unwrap().size().unwrap();
+
+            let constraints: &[Constraint; 3] = &config.display_options_ref().default_layout;
+
+            let layout_rect = if config.display_options_ref().show_borders() {
+                let area = Rect {
+                    y: area.top() + 1,
+                    height: area.height - 2,
+                    ..area
+                };
+
+                let block = Block::default().borders(Borders::ALL);
+                let inner = block.inner(area);
+
+                let layout_rect = Layout::default()
+                    .direction(Direction::Horizontal)
+                    .constraints(constraints.as_ref())
+                    .split(inner);
+
+                let block = Block::default().borders(Borders::LEFT);
+                let inner3 = block.inner(layout_rect[2]);
+                inner3
+            } else {
+                let layout_rect = Layout::default()
+                    .direction(Direction::Horizontal)
+                    .vertical_margin(1)
+                    .constraints(constraints.as_ref())
+                    .split(area);
+                layout_rect[2]
+            };
+
+            let file_full_path = p.as_path();
+            let preview_width = layout_rect.width;
+            let preview_height = layout_rect.height;
+            let image_cache = 0;
+            let preview_image = if preview_options.preview_images { 1 } else { 0 };
+
+            // spawn preview process
+            Command::new(script)
+                .arg(file_full_path)
+                .arg(preview_width.to_string())
+                .arg(preview_height.to_string())
+                .arg(image_cache.to_string())
+                .arg(preview_image.to_string())
+                .output()
+        }
+    }
+}
+
+pub fn preview_with_script(context: &AppContext, backend: &mut TuiBackend) -> io::Result<Output> {
+    let curr_tab = context.tab_context_ref().curr_tab_ref();
+    let child_list = curr_tab.child_list_ref();
+
+    let preview_options = context.config_ref().preview_options_ref();
+
+    let config = context.config_ref();
+
+    match child_list.and_then(|list| list.curr_entry_ref()) {
+        None => Err(io::Error::new(io::ErrorKind::Other, "No file to preview")),
+        Some(entry) => preview_path_with_script(context, backend, entry.file_path().to_path_buf()),
+    }
+}
diff --git a/src/preview/preview_sh.rs b/src/preview/preview_sh.rs
deleted file mode 100644
index 9d66ab4..0000000
--- a/src/preview/preview_sh.rs
+++ /dev/null
@@ -1,15 +0,0 @@
-use crate::context::AppContext;
-use crate::ui::TuiBackend;
-
-pub fn preview_with_script(context: &AppContext, backend: &mut TuiBackend) {
-    let preview_options = context.config_ref().preview_options_ref();
-    if let Some(script_path) = preview_options.preview_script.as_ref() {
-        let file_full_path = 0;
-        let preview_width = 0;
-        let preview_height = 0;
-        let image_cache = 0;
-        let preview_image = if preview_options.preview_images { 1 } else { 0 };
-
-        // spawn preview process
-    }
-}