Add option to use DOCKER_HOST variable for server uri

Closes: #61

CHANGELOG.md

@@ -1,3 +1,6 @@
+# 0.3.0
+- Add an option to respect `DOCKER_HOST` variable to the settings. If the checkbox is checked and the variable is present it will be used as the host uri.
+
 # 0.2.0
 - Explicitly sort sidepanel images/containers by newest
 - Persist settings as YAML file in appropriate OS config directory

src/app/mod.rs

@@ -758,13 +758,21 @@ impl App {
             self.add_error(e);
         } else {
             self.send_event_notify(EventRequest::DockerUriChange {
-                uri: self.settings_window.settings.docker_addr.clone(),
+                uri: self.docker_uri(),
             });
         }
     }
 
-    pub fn docker_uri(&self) -> &str {
-        &self.settings_window.settings.docker_addr
+    pub fn docker_uri(&self) -> String {
+        if self.settings_window.settings.use_docker_host_env {
+            match std::env::var("DOCKER_HOST") {
+                Ok(uri) => return uri,
+                Err(e) => {
+                    log::error!("failed to read DOCKER_HOST environment variable: {}", e);
+                }
+            }
+        }
+        self.settings_window.settings.docker_addr.clone()
     }
 
     fn handle_popups(&mut self) {

src/app/settings.rs

@@ -16,13 +16,15 @@ pub fn dir() -> Option<PathBuf> {
 pub struct Settings {
     pub docker_addr: String,
     pub fonts: FontSizes,
+    pub use_docker_host_env: bool,
 }
 
 impl Default for Settings {
     fn default() -> Self {
         Self {
             docker_addr: crate::DEFAULT_DOCKER_ADDR.to_string(),
             fonts: FontSizes::default(),
+            use_docker_host_env: false,
         }
     }
 }
@@ -109,6 +111,12 @@ impl SettingsWindow {
                     );
                     ui.end_row();
 
+                    ui.checkbox(
+                        &mut self.settings.use_docker_host_env,
+                        "Use DOCKER_HOST env var",
+                    );
+                    ui.end_row();
+
                     self.fonts_ui(ui);
                     ui.end_row();
 

src/main.rs

@@ -30,7 +30,7 @@ fn main() -> Result<()> {
         initial_window_size: Some((1280., 720.).into()),
         ..Default::default()
     };
-    let uri = app.docker_uri().to_string();
+    let uri = app.docker_uri();
 
     DockerWorker::spawn(rt, uri, rx_req, tx_rsp);