Configurable window dimensions

Adds a configuration option `dimensions` which will set initial
window size by columns and lines. Changes to the config file will
require restart.

resolves #370

6 files changed, 78 insertions, 18 deletions

diff --git a/README.md b/README.md
index e35998c4..aada4430 100644
--- a/README.md
+++ b/README.md
@@ -171,9 +171,9 @@ is created once alacritty is first run. On most systems this often defaults
 to `$HOME/.config/alacritty/alacritty.yml`.
 
 Many configuration options will take effect immediately upon saving changes to
-the config file. The only exception is the `font` and `dpi` section which
-requires Alacritty to be restarted. For further explanation of the config file,
-please consult the comments in the default config file.
+the config file. The only exception is the `font`, `dimensions` and `dpi` sections
+which requires Alacritty to be restarted. For further explanation of the config
+file, please consult the comments in the default config file.
 
 ## Issues (known, unknown, feature requests, etc)
 
diff --git a/alacritty.yml b/alacritty.yml
index 83b120f2..3ffd59a4 100644
--- a/alacritty.yml
+++ b/alacritty.yml
@@ -1,4 +1,9 @@
 # Configuration for Alacritty, the GPU enhanced terminal emulator
+# Window dimensions in character columns and lines
+# (changes require restart)
+dimensions:
+  columns: 80
+  lines: 40
 
 # The FreeType rasterizer needs to know the device DPI for best results
 # (changes require restart)
diff --git a/alacritty_macos.yml b/alacritty_macos.yml
index a3d8df86..d6b89f77 100644
--- a/alacritty_macos.yml
+++ b/alacritty_macos.yml
@@ -1,4 +1,9 @@
 # Configuration for Alacritty, the GPU enhanced terminal emulator
+# Window dimensions in character columns and lines
+# (changes require restart)
+dimensions:
+  columns: 80
+  lines: 40
 
 # The FreeType rasterizer needs to know the device DPI for best results
 # (changes require restart)
diff --git a/src/cli.rs b/src/cli.rs
index 1d19b353..51cdd4f9 100644
--- a/src/cli.rs
+++ b/src/cli.rs
@@ -14,7 +14,7 @@
 extern crate log;
 use clap::{Arg, App};
 use index::{Line, Column};
-use config::Shell;
+use config::{Dimensions, Shell};
 
 const DEFAULT_TITLE: &'static str = "Alacritty";
 
@@ -22,8 +22,7 @@ const DEFAULT_TITLE: &'static str = "Alacritty";
 pub struct Options {
     pub print_events: bool,
     pub ref_test: bool,
-    pub columns: Column,
-    pub lines: Line,
+    pub dimensions: Option<Dimensions>,
     pub title: String,
     pub log_level: log::LogLevelFilter,
     pub shell: Option<Shell<'static>>,
@@ -34,8 +33,7 @@ impl Default for Options {
         Options {
             print_events: false,
             ref_test: false,
-            columns: Column(80),
-            lines: Line(24),
+            dimensions: None,
             title: DEFAULT_TITLE.to_owned(),
             log_level: log::LogLevelFilter::Warn,
             shell: None,
@@ -95,8 +93,11 @@ impl Options {
         }
 
         if let Some(mut dimensions) = matches.values_of("dimensions") {
-            dimensions.next().map(|w| w.parse().map(|w| options.columns = Column(w)));
-            dimensions.next().map(|h| h.parse().map(|h| options.lines = Line(h)));
+            let width = dimensions.next().map(|w| w.parse().map(|w| Column(w)));
+            let height = dimensions.next().map(|h| h.parse().map(|h| Line(h)));
+            if let (Some(Ok(width)), Some(Ok(height))) = (width, height) {
+                options.dimensions = Some(Dimensions::new(width, height));
+            }
         }
 
         if let Some(title) = matches.value_of("title") {
@@ -128,12 +129,8 @@ impl Options {
         options
     }
 
-    pub fn lines_u32(&self) -> u32 {
-        self.lines.0 as u32
-    }
-
-    pub fn columns_u32(&self) -> u32 {
-        self.columns.0 as u32
+    pub fn dimensions(&self) -> Option<Dimensions> {
+        self.dimensions
     }
 
     pub fn shell(&self) -> Option<&Shell> {
diff --git a/src/config.rs b/src/config.rs
index d08b801b..362fe645 100644
--- a/src/config.rs
+++ b/src/config.rs
@@ -23,6 +23,7 @@ use serde::de::{Visitor, MapVisitor, Unexpected};
 use notify::{Watcher as WatcherApi, RecommendedWatcher as FileWatcher, op};
 
 use input::{Action, Binding, MouseBinding, KeyBinding};
+use index::{Line, Column};
 
 use ansi;
 
@@ -212,6 +213,10 @@ impl<'a> Shell<'a> {
 /// Top-level config type
 #[derive(Debug, Deserialize)]
 pub struct Config {
+    /// Initial dimensions
+    #[serde(default)]
+    dimensions: Dimensions,
+
     /// Pixels per inch
     #[serde(default)]
     dpi: Dpi,
@@ -273,6 +278,7 @@ impl Default for Config {
     fn default() -> Config {
         Config {
             draw_bold_text_with_bright_colors: true,
+            dimensions: Default::default(),
             dpi: Default::default(),
             font: Default::default(),
             render_timer: Default::default(),
@@ -969,6 +975,12 @@ impl Config {
         &self.font
     }
 
+    /// Get window dimensions
+    #[inline]
+    pub fn dimensions(&self) -> Dimensions {
+        self.dimensions
+    }
+
     /// Get dpi config
     #[inline]
     pub fn dpi(&self) -> &Dpi {
@@ -1020,6 +1032,45 @@ impl Config {
     }
 }
 
+/// Window Dimensions
+///
+/// Newtype to avoid passing values incorrectly
+#[derive(Debug, Copy, Clone, Deserialize)]
+pub struct Dimensions {
+    /// Window width in character columns
+    columns: Column,
+
+    /// Window Height in character lines
+    lines: Line,
+}
+
+impl Default for Dimensions {
+    fn default() -> Dimensions {
+        Dimensions::new(Column(80), Line(24))
+    }
+}
+
+impl Dimensions {
+    pub fn new(columns: Column, lines: Line) -> Self {
+        Dimensions {
+            columns: columns,
+            lines: lines
+        }
+    }
+
+    /// Get lines
+    #[inline]
+    pub fn lines_u32(&self) -> u32 {
+        self.lines.0 as u32
+    }
+
+    /// Get columns
+    #[inline]
+    pub fn columns_u32(&self) -> u32 {
+        self.columns.0 as u32
+    }
+}
+
 /// Pixels per inch
 ///
 /// This is only used on `FreeType` systems
diff --git a/src/display.rs b/src/display.rs
index b1ab3ed9..0b242b33 100644
--- a/src/display.rs
+++ b/src/display.rs
@@ -177,8 +177,10 @@ impl Display {
         let cell_height = (metrics.line_height + font.offset().y() as f64) as u32;
 
         // Resize window to specified dimensions
-        let width = cell_width * options.columns_u32() + 4;
-        let height = cell_height * options.lines_u32() + 4;
+        let dimensions = options.dimensions()
+            .unwrap_or_else(|| config.dimensions());
+        let width = cell_width * dimensions.columns_u32() + 4;
+        let height = cell_height * dimensions.lines_u32() + 4;
         let size = Size { width: Pixels(width), height: Pixels(height) };
         info!("set_inner_size: {}", size);