Use UTF-8 drawing characters for printer methods

Instead of ncurses chtype.

Cargo.toml

@@ -1,8 +1,8 @@
 [package]
 authors = ["Alexandre Bury <alexandre.bury@gmail.com>"]
 description = "A TUI library based on ncurses-rs"
-keywords = ["ncurses", "TUI"]
 documentation = "https://gyscos.github.io/Cursive/cursive/index.html"
+keywords = ["ncurses", "TUI"]
 license = "MIT"
 name = "cursive"
 readme = "Readme.md"
@@ -12,6 +12,7 @@ version = "0.0.2"
 [dependencies]
 ncurses = "5.80.0"
 toml = "0.1"
+unicode-segmentation = "0.1.2"
 
 [[example]]
 name = "hello_world"

src/lib.rs

@@ -22,6 +22,7 @@
 //! ```
 extern crate ncurses;
 extern crate toml;
+extern crate unicode_segmentation;
 
 pub mod event;
 pub mod view;

src/printer.rs

@@ -3,7 +3,6 @@
 use std::cmp::min;
 
 use ncurses;
-use ncurses::chtype;
 
 use theme::{ColorPair, Theme};
 use vec::{Vec2, ToVec2};
@@ -54,7 +53,7 @@ impl Printer {
     }
 
     /// Prints a vertical line using the given character.
-    pub fn print_vline<T: ToVec2>(&self, start: T, len: usize, c: chtype) {
+    pub fn print_vline<T: ToVec2>(&self, start: T, len: usize, c: &str) {
         let p = start.to_vec2();
         if p.y > self.size.y || p.x > self.size.x {
             return;
@@ -63,13 +62,12 @@ impl Printer {
 
         let p = p + self.offset;
         for y in 0..len {
-            ncurses::mvaddstr((p.y + y) as i32, p.x as i32, "│");
+            ncurses::mvaddstr((p.y + y) as i32, p.x as i32, c);
-            // ncurses::mvaddstr(p.y as i32, p.x as i32, "┌");
         }
     }
 
     /// Prints a horizontal line using the given character.
-    pub fn print_hline<T: ToVec2>(&self, start: T, len: usize, c: chtype) {
+    pub fn print_hline<T: ToVec2>(&self, start: T, len: usize, c: &str) {
         let p = start.to_vec2();
         if p.y > self.size.y || p.x > self.size.x {
             return;
@@ -77,7 +75,9 @@ impl Printer {
         let len = min(len, self.size.x - p.x);
 
         let p = p + self.offset;
-        ncurses::mvhline(p.y as i32, p.x as i32, c, len as i32);
+        for x in 0..len {
+            ncurses::mvaddstr(p.y as i32, (p.x + x) as i32, c);
+        }
     }
 
     /// Call the given closure with a colored printer,
@@ -131,14 +131,10 @@ impl Printer {
         self.print(start_v + size_v.keep_y(), "└");
         self.print(start_v + size_v, "┘");
 
-        self.print_hline(start_v + (1, 0), size_v.x - 1, ncurses::ACS_HLINE());
+        self.print_hline(start_v + (1, 0), size_v.x - 1, "─");
-        self.print_vline(start_v + (0, 1), size_v.y - 1, ncurses::ACS_VLINE());
+        self.print_vline(start_v + (0, 1), size_v.y - 1, "│");
-        self.print_hline(start_v + (1, 0) + size_v.keep_y(),
+        self.print_hline(start_v + (1, 0) + size_v.keep_y(), size_v.x - 1, "─");
-                         size_v.x - 1,
+        self.print_vline(start_v + (0, 1) + size_v.keep_x(), size_v.y - 1, "│");
-                         ncurses::ACS_HLINE());
-        self.print_vline(start_v + (0, 1) + size_v.keep_x(),
-                         size_v.y - 1,
-                         ncurses::ACS_VLINE());
     }
 
     /// Returns a printer on a subset of this one's area.

src/view/edit_view.rs

@@ -1,4 +1,5 @@
-use ncurses::{self, chtype};
+use ncurses;
+use unicode_segmentation::UnicodeSegmentation;
 
 use std::cmp::min;
 
@@ -83,7 +84,7 @@ impl View for EditView {
             printer.with_style(ncurses::A_REVERSE(), |printer| {
                 if len < self.last_length {
                     printer.print((0, 0), &self.content);
-                    printer.print_hline((len, 0), printer.size.x - len, '_' as chtype);
+                    printer.print_hline((len, 0), printer.size.x - len, "_");
                 } else {
                     let visible_end = min(self.content.len(), self.offset + self.last_length);
 
@@ -98,17 +99,17 @@ impl View for EditView {
             // Now print cursor
             if printer.focused {
                 let c = if self.cursor == len {
-                    '_'
+                    "_"
                 } else {
                     // Get the char from the string... Is it so hard?
                     self.content
-                        .chars()
+                        .graphemes(true)
                         .nth(self.cursor)
                         .expect(&format!("Found no char at cursor {} in {}",
                                          self.cursor,
                                          self.content))
                 };
-                printer.print_hline((self.cursor - self.offset, 0), 1, c as chtype);
+                printer.print_hline((self.cursor - self.offset, 0), 1, c);
             }
         });
     }

src/view/scroll.rs

@@ -1,5 +1,4 @@
 use std::cmp::{min, max};
-use ncurses::chtype;
 
 use theme::ColorPair;
 use vec::Vec2;
@@ -134,9 +133,9 @@ impl ScrollBase {
                 ColorPair::HighlightInactive
             };
 
-            printer.print_vline((printer.size.x - 1, 0), printer.size.y, '|' as chtype);
+            printer.print_vline((printer.size.x - 1, 0), printer.size.y, "|");
             printer.with_color(color, |printer| {
-                printer.print_vline((printer.size.x - 1, start), height, ' ' as chtype);
+                printer.print_vline((printer.size.x - 1, start), height, " ");
             });
         }
     }

src/view/select_view.rs

@@ -1,6 +1,5 @@
 use std::cmp::min;
 use std::rc::Rc;
-use ncurses::chtype;
 
 use theme::ColorPair;
 use Cursive;
@@ -140,9 +139,9 @@ impl<T: 'static> View for SelectView<T> {
             printer.with_color(style, |printer| {
                 let l = self.items[i].label.chars().count();
                 let x = self.align.h.get_offset(l, printer.size.x);
-                printer.print_hline((0, 0), x, ' ' as chtype);
+                printer.print_hline((0, 0), x, " ");
                 printer.print((x, 0), &self.items[i].label);
-                printer.print_hline((x + l, 0), printer.size.x - l - x, ' ' as chtype);
+                printer.print_hline((x + l, 0), printer.size.x - l - x, " ");
             });
         });
     }

src/view/shadow_view.rs

@@ -1,4 +1,3 @@
-use ncurses::chtype;
 use view::{View, ViewWrapper, SizeRequest};
 use printer::Printer;
 use vec::Vec2;
@@ -34,7 +33,7 @@ impl<T: View> ViewWrapper for ShadowView<T> {
         printer.with_color(ColorPair::Primary, |printer| {
             // Draw the view background
             for y in 1..printer.size.y - 1 {
-                printer.print_hline((1, y), printer.size.x - 2, ' ' as chtype);
+                printer.print_hline((1, y), printer.size.x - 2, " ");
             }
         });
 
@@ -44,8 +43,8 @@ impl<T: View> ViewWrapper for ShadowView<T> {
         let w = printer.size.x - 1;
 
         printer.with_color(ColorPair::Shadow, |printer| {
-            printer.print_hline((2, h), w - 1, ' ' as chtype);
+            printer.print_hline((2, h), w - 1, " ");
-            printer.print_vline((w, 2), h - 1, ' ' as chtype);
+            printer.print_vline((w, 2), h - 1, " ");
         });
     }
 }