From c9d09f6f9897cf0e8d6823067ed61eed1809d6d1 Mon Sep 17 00:00:00 2001
From: Nathan Vegdahl <cessen@cessen.com>
Date: Sat, 31 Jan 2015 15:06:04 -0800
Subject: [PATCH] Moved line_ending_type out of Buffer and into Editor.

---
 src/buffer/mod.rs  |  4 +--
 src/editor/mod.rs  | 73 ++++++++++++++++++++++++++++++++++++++++++++++
 src/files.rs       |  5 +---
 src/term_ui/mod.rs |  4 +--
 todo.md            |  2 --
 5 files changed, 77 insertions(+), 11 deletions(-)

diff --git a/src/buffer/mod.rs b/src/buffer/mod.rs
index ec95782..ef64675 100644
--- a/src/buffer/mod.rs
+++ b/src/buffer/mod.rs
@@ -2,7 +2,7 @@
 
 use std::mem;
 
-use self::line::{Line, LineEnding};
+use self::line::Line;
 use self::node::{BufferNode, BufferNodeGraphemeIter, BufferNodeLineIter};
 use self::undo_stack::{UndoStack};
 use self::undo_stack::Operation::*;
@@ -23,7 +23,6 @@ mod undo_stack;
 pub struct Buffer<T: LineFormatter> {
     text: BufferNode,
     undo_stack: UndoStack,
-    pub line_ending_type: LineEnding,
     pub formatter: T,
 }
 
@@ -33,7 +32,6 @@ impl<T: LineFormatter> Buffer<T> {
         Buffer {
             text: BufferNode::new(&formatter),
             undo_stack: UndoStack::new(),
-            line_ending_type: LineEnding::LF,
             formatter: formatter,
         }
     }
diff --git a/src/editor/mod.rs b/src/editor/mod.rs
index 032aef9..606624f 100644
--- a/src/editor/mod.rs
+++ b/src/editor/mod.rs
@@ -1,6 +1,7 @@
 #![allow(dead_code)]
 
 use buffer::Buffer;
+use buffer::line::LineEnding;
 use buffer::line_formatter::LineFormatter;
 use buffer::line_formatter::RoundingBehavior::*;
 use std::path::Path;
@@ -15,6 +16,7 @@ mod cursor;
 pub struct Editor<T: LineFormatter> {
     pub buffer: Buffer<T>,
     pub file_path: Path,
+    pub line_ending_type: LineEnding,
     pub soft_tabs: bool,
     pub soft_tab_width: u8,
     pub dirty: bool,
@@ -34,6 +36,7 @@ impl<T: LineFormatter> Editor<T> {
         Editor {
             buffer: Buffer::new(formatter),
             file_path: Path::new(""),
+            line_ending_type: LineEnding::LF,
             soft_tabs: false,
             soft_tab_width: 4,
             dirty: false,
@@ -53,6 +56,7 @@ impl<T: LineFormatter> Editor<T> {
         let mut ed = Editor {
             buffer: buf,
             file_path: path.clone(),
+            line_ending_type: LineEnding::LF,
             soft_tabs: false,
             soft_tab_width: 4,
             dirty: false,
@@ -68,6 +72,7 @@ impl<T: LineFormatter> Editor<T> {
         //cur.update_vis_start(&(ed.buffer));
         //ed.cursors.add_cursor(cur);
         
+        ed.auto_detect_line_ending();
         ed.auto_detect_indentation_style();
         
         return ed;
@@ -80,6 +85,74 @@ impl<T: LineFormatter> Editor<T> {
         }
     }
     
+    pub fn auto_detect_line_ending(&mut self) {
+        let mut line_ending_histogram: [usize; 8] = [0, 0, 0, 0, 0, 0, 0, 0];
+        
+        // Collect statistics
+        let mut line_i: usize = 0;
+        for line in self.buffer.line_iter() {
+            match line.ending {
+                LineEnding::None => {
+                },
+                LineEnding::CRLF => {
+                    line_ending_histogram[0] += 1;
+                },
+                LineEnding::LF => {
+                    line_ending_histogram[1] += 1;
+                },
+                LineEnding::VT => {
+                    line_ending_histogram[2] += 1;
+                },
+                LineEnding::FF => {
+                    line_ending_histogram[3] += 1;
+                },
+                LineEnding::CR => {
+                    line_ending_histogram[4] += 1;
+                },
+                LineEnding::NEL => {
+                    line_ending_histogram[5] += 1;
+                },
+                LineEnding::LS => {
+                    line_ending_histogram[6] += 1;
+                },
+                LineEnding::PS => {
+                    line_ending_histogram[7] += 1;
+                },
+            }
+            
+            // Stop after 100 lines
+            line_i += 1;
+            if line_i > 100 {
+                break;
+            }
+        }
+        
+        // Analyze stats and make a determination
+        let mut lei = 0;
+        let mut le_count = 0;
+        for i in 0us..8 {
+            if line_ending_histogram[i] > le_count {
+                lei = i;
+                le_count = line_ending_histogram[i];
+            }
+        }
+        
+        if le_count > 0 {
+            self.line_ending_type = match lei {
+                0 => LineEnding::CRLF,
+                1 => LineEnding::LF,
+                2 => LineEnding::VT,
+                3 => LineEnding::FF,
+                4 => LineEnding::CR,
+                5 => LineEnding::NEL,
+                6 => LineEnding::LS,
+                7 => LineEnding::PS,
+                
+                _ => LineEnding::LF,
+            };
+        }
+    }
+    
     pub fn auto_detect_indentation_style(&mut self) {
         let mut tab_blocks: usize = 0;
         let mut space_blocks: usize = 0;
diff --git a/src/files.rs b/src/files.rs
index 074cccb..01f53c3 100644
--- a/src/files.rs
+++ b/src/files.rs
@@ -2,7 +2,7 @@ use std::old_io::{IoResult, BufferedReader, BufferedWriter};
 use std::old_io::fs::File;
 use std::path::Path;
 
-use buffer::line::{Line, LineEnding, line_ending_to_str};
+use buffer::line::{Line, line_ending_to_str};
 use buffer::line_formatter::LineFormatter;
 use buffer::Buffer as TextBuffer;
 
@@ -12,9 +12,6 @@ pub fn load_file_to_buffer<T: LineFormatter>(path: &Path, lf: T) -> IoResult<Tex
     
     for line in f.lines() {
         let l = Line::new_from_string_unchecked(line.unwrap());
-        if l.ending != LineEnding::None {
-            tb.line_ending_type = l.ending;
-        }
         tb.append_line_unchecked(l);
     }
     
diff --git a/src/term_ui/mod.rs b/src/term_ui/mod.rs
index 7b109e1..c72e446 100644
--- a/src/term_ui/mod.rs
+++ b/src/term_ui/mod.rs
@@ -149,7 +149,7 @@ impl TermUI {
                             },
                             
                             K_ENTER => {
-                                let nl = line_ending_to_str(self.editor.buffer.line_ending_type);
+                                let nl = line_ending_to_str(self.editor.line_ending_type);
                                 self.editor.insert_text_at_cursor(nl);
                             },
                             
@@ -327,7 +327,7 @@ impl TermUI {
         self.rb.print(c2.1 - pstring.len(), c1.0, rustbox::RB_NORMAL, foreground, background, &pstring[]);
         
         // Text encoding info and tab style
-        let nl = match editor.buffer.line_ending_type {
+        let nl = match editor.line_ending_type {
             LineEnding::None => "None",
             LineEnding::CRLF => "CRLF",
             LineEnding::LF => "LF",
diff --git a/todo.md b/todo.md
index ca7075e..d7e5a09 100644
--- a/todo.md
+++ b/todo.md
@@ -25,10 +25,8 @@
   only recognizes LF and CRLF.
 - File loading is currently very slow.  Investigate.
 - Line number display
-- Line wrapping
 - File opening by entering path
 - UI that wraps editors, for split view.
 - Persistent infinite undo
-- Multiple cursors
 - "Projects"