add support for date formatting of the commandline

.vscode/tasks.json

@@ -11,8 +11,8 @@
                 //"/home/gabm/Pictures/Wallpaper/torres_1.jpg",
                 "/home/gabm/Pictures/Screenshots/satty-20231116-10:35:51.png",
                 //"--fullscreen",
-                "--output-filename",
-                "/tmp/out.png",
+                //"--output-filename",
+                //"/tmp/out.png",
                 "--copy-command",
                 "wl-copy",
             ],

Cargo.toml

@@ -36,6 +36,8 @@ toml = "0.8.8"
 serde = "1.0"
 serde_derive = "1.0"
 hex_color = {version = "3", features = ["serde"]}
+chrono = "0.4.31"
+
 
 [dependencies.relm4-icons]
 version = "0.6.0"

src/configuration.rs

@@ -131,7 +131,9 @@ impl Configuration {
         if let Some(v) = general.copy_command {
             self.copy_command = Some(v);
         }
-        // output_filename is not yet supported
+        if let Some(v) = general.output_filename {
+            self.output_filename = Some(v);
+        }
         if let Some(v) = general.annotation_size_factor {
             self.annotation_size_factor = v;
         }
@@ -247,6 +249,7 @@ struct ConfiguationFileGeneral {
     initial_tool: Option<Tools>,
     copy_command: Option<String>,
     annotation_size_factor: Option<f64>,
+    output_filename: Option<String>,
 }
 
 #[derive(Deserialize)]

src/sketch_board.rs

@@ -1,4 +1,5 @@
 use anyhow::anyhow;
+use chrono::format::strftime;
 use gdk_pixbuf::Pixbuf;
 use std::cell::RefCell;
 use std::fs;
@@ -151,6 +152,9 @@ impl SketchBoard {
             Some(o) => o.clone(),
         };
 
+        // run the output filename by "chrono date format"
+        let output_filename = format!("{}", chrono::Local::now().format(&output_filename));
+
         if !output_filename.ends_with(".png") {
             let msg = "The only supported format is png, but the filename does not end in png";
             println!("{msg}");