solve #36 by adding :fill command

README.md

@@ -68,6 +68,7 @@ These commands operate on selections.
 | - | - |
 | `:plot` | Plots the current selection to `plot.png` using gnuplot |
 | `:export <filename>` | Exports the current selection to a new file |
+| `:fill <value>` | (Aliased as `f`) Fill the selection with `<value>`, special variables `x`,`y`,`xi`, and `yi` are avaliable. Variables `x` and `y` are the global coordinates of the cell, and `xi` and `yi` are the local coordinates of the selection. |
 
 ## Math / Functions
 

src/app/app.rs

@@ -63,7 +63,7 @@ impl Widget for &App {
         for x in 0..x_max {
             for y in 0..y_max {
                 let mut display = String::new();
-                let mut style = Style::new().fg(Color::White);
+                let mut style = Style::new();
 
                 // Custom width for the header of each row
                 let row_header_width = get_header_size() as u16;
@@ -148,6 +148,9 @@ impl Widget for &App {
                                             Ok(val) => {
                                                 display = val.to_string();
                                                 style = Style::new()
+                                                    .fg(Color::White)
+                                                    // TODO This breaks dumb terminals like the windows
+                                                    // terminal
                                                     .underline_color(Color::DarkGray)
                                                     .add_modifier(Modifier::UNDERLINED);
                                             }

src/app/mode.rs

@@ -175,6 +175,21 @@ impl Mode {
             };
 
             match args[0] {
+                "f" | "fill" => {
+                    for (i, x) in (low_x..=hi_x).enumerate() {
+                        for (j, y) in (low_y..=hi_y).enumerate() {
+                            let arg = args.get(1)
+                                .map(|s| s.replace("xi", &i.to_string()))
+                                .map(|s| s.replace("yi", &j.to_string()))
+                                .map(|s| s.replace("x", &x.to_string()))
+                                .map(|s| s.replace("y", &y.to_string()))
+                                    ;
+                            app.grid.set_cell_raw((x,y), arg);
+                        }
+                    }
+
+                    app.mode = Mode::Normal
+                }
                 "export" => {
                     if let Some(arg1) = args.get(1) {
                         save_range(&arg1);