Make packages scroll incrementally instead of using 1.4GB of ram

src/packages/browse.rs

@@ -1,12 +1,15 @@
 use gtk::{
-    prelude::{BoxExt, ButtonExt, Cast, EditableExt, ListBoxRowExt},
+    prelude::{BoxExt, ButtonExt, EditableExt},
-    Button, Window,
+    Button, PositionType, Window,
 };
 use std::process::Command;
 
 use gtk::{Align, ListBox, ScrolledWindow, SearchBar, SearchEntry};
 
 pub static mut PACKAGES_LIST: Option<ListBox> = None;
+pub static mut PKG_LIST: Vec<String> = vec![];
+pub static mut PKG_LIST_INDEX: usize = 0;
+pub static mut PKG_LISTBOX: Option<ScrolledWindow> = None;
 
 pub fn browse() -> gtk::Box {
     let packages_box = gtk::Box::builder()
@@ -33,6 +36,8 @@ pub fn browse() -> gtk::Box {
         .hexpand(true)
         .build();
 
+    let skip_list = vec!["available", "installed", "last"];
+
     unsafe {
         PACKAGES_LIST = Some(
             ListBox::builder()
@@ -54,20 +59,29 @@ pub fn browse() -> gtk::Box {
     )
     .unwrap();
 
-    let pkg_list = pkg_list
+    unsafe {
+        PKG_LIST = pkg_list
             .lines()
-        .skip(1)
             .map(|x| {
-            x.split_whitespace()
+                let y = x.to_string();
+                let b = y
+                    .split_whitespace()
                     .next()
                     .unwrap_or("")
                     .split(".")
                     .next()
-                .unwrap()
+                    .unwrap();
+                b.to_string()
             })
-        .filter(|x| !x.trim().is_empty());
+            .filter(|x| {
+                !x.trim().is_empty()
+                    && !x.contains("=")
+                    && !skip_list.contains(&x.to_lowercase().trim())
+            })
+            .collect();
 
-    for pkg in pkg_list {
+        for pkg in PKG_LIST[0..(50.min(PKG_LIST.len()))].to_vec() {
+            PKG_LIST_INDEX += 1;
             let pkg_btn = Button::builder()
                 .label(pkg)
                 .css_classes(["package-name"])
@@ -76,46 +90,64 @@ pub fn browse() -> gtk::Box {
             pkg_btn.connect_clicked(|x| {
                 show_installed_package(x.label().map(|x| x.to_string()).unwrap_or("".to_owned()));
             });
-        unsafe { PACKAGES_LIST.as_ref().unwrap().append(&pkg_btn) };
+            PACKAGES_LIST.as_ref().unwrap().append(&pkg_btn)
+        }
     }
 
-    pkgs_entry.connect_search_changed(move |x| {
-        let x = x.clone();
-
-        // TODO: Possibly refactor to use `dnf search` instead of a filter function.
     unsafe {
-            PACKAGES_LIST.as_ref().unwrap().set_filter_func(move |y| {
+        PKG_LISTBOX = Some(
-                y.child()
+            ScrolledWindow::builder()
-                    .unwrap()
-                    .downcast::<Button>()
-                    .unwrap()
-                    .label()
-                    .map(|x| x.to_string())
-                    .unwrap_or("".to_string())
-                    .contains(x.text().to_string().as_str())
-            })
-        };
-    });
-
-    let pkg_listbox = ScrolledWindow::builder()
                 .css_classes(["package-list-scrollable"])
                 .valign(Align::Center)
                 .halign(Align::Center)
                 .width_request(800)
                 .height_request(600)
+                .build(),
+        );
+
+        PKG_LISTBOX
+            .as_ref()
+            .unwrap()
+            .connect_edge_reached(|_, edge| {
+                if edge == PositionType::Bottom {
+                    for i in PKG_LIST_INDEX..((PKG_LIST_INDEX + 50).min(PKG_LIST.len())) {
+                        let pkg_btn = Button::builder()
+                            .label(PKG_LIST[i].as_str())
+                            .css_classes(["package-name"])
                             .build();
 
+                        pkg_btn.connect_clicked(|x| {
+                            show_installed_package(
+                                x.label().map(|x| x.to_string()).unwrap_or("".to_owned()),
+                            );
+                        });
+                        PACKAGES_LIST.as_ref().unwrap().append(&pkg_btn);
+
+                        PKG_LIST_INDEX += 1;
+                    }
+                }
+            })
+    };
+
+    pkgs_entry.connect_search_changed(move |x| {
+        let f = x.clone();
+
+        // TODO: Possibly refactor to use `dnf search` instead of a filter function.
+        unsafe { search(&f, &skip_list) }
+    });
+
     pkgs_search.connect_entry(&pkgs_entry);
 
     packages_box.append(&pkgs_search);
     packages_box.append(&pkgs_entry);
+    unsafe {
+        packages_box.append(PKG_LISTBOX.as_ref().unwrap());
 
-    packages_box.append(&pkg_listbox);
+        PKG_LISTBOX
-
+            .as_ref()
-    pkg_listbox.set_child(Some(unsafe { PACKAGES_LIST.as_ref().unwrap() }));
+            .unwrap()
-
+            .set_child(Some(PACKAGES_LIST.as_ref().unwrap()));
-    dbg!(&pkg_listbox);
+    };
-
     packages_box
 }
 
@@ -124,5 +156,67 @@ fn show_installed_package(pkg: String) {
         return;
     }
 
-    let pkg_window = Window::builder().build();
+    let _pkg_window = Window::builder().build();
+}
+
+unsafe fn search(f: &SearchEntry, skip_list: &Vec<&str>) {
+    let pkg_list = String::from_utf8(
+        Command::new("dnf")
+            .args(["search", f.text().to_string().as_str()])
+            .output()
+            .unwrap()
+            .stdout,
+    )
+    .unwrap();
+
+    PKG_LIST = pkg_list
+        .lines()
+        .map(|x| {
+            let y = x.to_string();
+            let b = y
+                .split_whitespace()
+                .next()
+                .unwrap_or("")
+                .split(".")
+                .next()
+                .unwrap();
+            b.to_string()
+        })
+        .filter(|x| {
+            !x.trim().is_empty()
+                && !x.contains("=")
+                && !skip_list.contains(&x.to_lowercase().trim())
+        })
+        .collect();
+
+    std::mem::drop(PACKAGES_LIST.take());
+
+    PACKAGES_LIST = Some(
+        ListBox::builder()
+            .css_classes(["packages-list"])
+            .valign(Align::Center)
+            .halign(Align::Fill)
+            .hexpand(true)
+            .build(),
+    );
+
+    PKG_LIST_INDEX = 0;
+
+    for pkg in PKG_LIST[0..(50.min(PKG_LIST.len()))].to_vec() {
+        PKG_LIST_INDEX += 1;
+        let pkg_btn = Button::builder()
+            .label(pkg)
+            .css_classes(["package-name"])
+            .build();
+
+        pkg_btn.connect_clicked(|x| {
+            show_installed_package(x.label().map(|x| x.to_string()).unwrap_or("".to_owned()));
+        });
+        PACKAGES_LIST.as_ref().unwrap().append(&pkg_btn)
+    }
+
+    PKG_LISTBOX
+        .as_ref()
+        .unwrap()
+        .set_child(Some(PACKAGES_LIST.as_ref().unwrap()));
 }

src/packages/installed.rs

@@ -1,12 +1,14 @@
 use gtk::{
     prelude::{BoxExt, ButtonExt, Cast, EditableExt, ListBoxRowExt},
-    Button, Window,
+    Button, PositionType, Window,
 };
 use std::process::Command;
 
 use gtk::{Align, ListBox, ScrolledWindow, SearchBar, SearchEntry};
 
 pub static mut PACKAGES_LIST: Option<ListBox> = None;
+pub static mut PKG_LIST: Vec<String> = vec![];
+pub static mut PKG_LIST_INDEX: usize = 0;
 
 pub fn installed() -> gtk::Box {
     let packages_box = gtk::Box::builder()
@@ -33,6 +35,8 @@ pub fn installed() -> gtk::Box {
         .hexpand(true)
         .build();
 
+    let skip_list = vec!["available", "installed", "last"];
+
     unsafe {
         PACKAGES_LIST = Some(
             ListBox::builder()
@@ -44,6 +48,7 @@ pub fn installed() -> gtk::Box {
         )
     };
 
+    unsafe {
         // TODO: Make this part asynchronous so that the app opens faster
         let pkg_list = String::from_utf8(
             Command::new("dnf")
@@ -53,21 +58,30 @@ pub fn installed() -> gtk::Box {
                 .stdout,
         )
         .unwrap();
-
+        PKG_LIST = pkg_list
-    let pkg_list = pkg_list
             .lines()
-        .skip(1)
             .map(|x| {
-            x.split_whitespace()
+                let y = x.to_string();
+                let b = y
+                    .split_whitespace()
                     .next()
                     .unwrap_or("")
                     .split(".")
                     .next()
-                .unwrap()
+                    .unwrap();
+                b.to_string()
             })
-        .filter(|x| !x.trim().is_empty());
+            .filter(|x| {
+                !x.trim().is_empty()
+                    && !x.contains("=")
+                    && !skip_list.contains(&x.to_lowercase().trim())
+            })
+            .collect()
+    };
 
-    for pkg in pkg_list {
+    unsafe {
+        for pkg in PKG_LIST[0..50].to_vec() {
+            PKG_LIST_INDEX += 1;
             let pkg_btn = Button::builder()
                 .label(pkg)
                 .css_classes(["package-name"])
@@ -76,11 +90,14 @@ pub fn installed() -> gtk::Box {
             pkg_btn.connect_clicked(|x| {
                 show_installed_package(x.label().map(|x| x.to_string()).unwrap_or("".to_owned()));
             });
-        unsafe { PACKAGES_LIST.as_ref().unwrap().append(&pkg_btn) };
+            PACKAGES_LIST.as_ref().unwrap().append(&pkg_btn)
+        }
     }
 
     pkgs_entry.connect_search_changed(move |x| {
         let x = x.clone();
+
+        // TODO: Possibly refactor to use `dnf search` instead of a filter function.
         unsafe {
             PACKAGES_LIST.as_ref().unwrap().set_filter_func(move |y| {
                 y.child()
@@ -103,6 +120,28 @@ pub fn installed() -> gtk::Box {
         .height_request(600)
         .build();
 
+    pkg_listbox.connect_edge_reached(|_, edge| {
+        if edge == PositionType::Bottom {
+            unsafe {
+                for i in PKG_LIST_INDEX..(PKG_LIST_INDEX + 50) {
+                    let pkg_btn = Button::builder()
+                        .label(PKG_LIST[i].as_str())
+                        .css_classes(["package-name"])
+                        .build();
+
+                    pkg_btn.connect_clicked(|x| {
+                        show_installed_package(
+                            x.label().map(|x| x.to_string()).unwrap_or("".to_owned()),
+                        );
+                    });
+                    PACKAGES_LIST.as_ref().unwrap().append(&pkg_btn);
+
+                    PKG_LIST_INDEX += 1;
+                }
+            }
+        }
+    });
+
     pkgs_search.connect_entry(&pkgs_entry);
 
     packages_box.append(&pkgs_search);
@@ -112,8 +151,6 @@ pub fn installed() -> gtk::Box {
 
     pkg_listbox.set_child(Some(unsafe { PACKAGES_LIST.as_ref().unwrap() }));
 
-    dbg!(&pkg_listbox);
-
     packages_box
 }
 
@@ -122,5 +159,5 @@ fn show_installed_package(pkg: String) {
         return;
     }
 
-    let pkg_window = Window::builder().build();
+    let _pkg_window = Window::builder().build();
 }