From 812f3f69c854a5376dc0d123c4e545cf67c8690c Mon Sep 17 00:00:00 2001
From: Jan Tuomi <jan-sebastian.tuomi@aalto.fi>
Date: Sun, 9 Oct 2016 14:35:59 +0300
Subject: Fix printing issues

---
 editor.cpp | 14 +++++++++++---
 editor.h   |  2 --
 utils.cpp  | 23 ++++++++++++++++++++++-
 utils.h    |  3 +++
 4 files changed, 36 insertions(+), 6 deletions(-)

diff --git a/editor.cpp b/editor.cpp
index f8c8ade..ff12c9e 100644
--- a/editor.cpp
+++ b/editor.cpp
@@ -3,6 +3,7 @@
 #include <fstream>
 #include <limits>
 #include <iostream>
+#include <iomanip>
 
 Editor::Editor(std::vector<std::string>* contents, const std::string& filename):
     m_current_line(0), m_filename(filename), m_stopped(false)  {
@@ -48,14 +49,21 @@ int Editor::run_editor() {
 }
 
 int Editor::print_contents_on_line(int line) const {
+    Utils::clear_screen();
+
     int output_length = m_contents->size();
     bool truncated = false;
-    if ((int) m_contents->size() > line + OUTPUT_LINE_MAX) {
-        output_length = line + OUTPUT_LINE_MAX;
+    int line_max = Utils::window_height() - 3;
+
+    int line_number_width = Utils::count_digits(m_contents->size());
+
+    if ((int) m_contents->size() > line + line_max) {
+        output_length = line + line_max;
         truncated = true;
     }
     for (int i = line; i < output_length; i++) {
-        std::cout << i << " " << m_contents->at(i) << '\n';
+        std::cout << std::setw(line_number_width) << i;
+        std::cout << " " << m_contents->at(i) << '\n';
     }
     if (truncated) {
         std::cout << "...\n";
diff --git a/editor.h b/editor.h
index 5cc5fdf..3e5c91d 100644
--- a/editor.h
+++ b/editor.h
@@ -9,8 +9,6 @@ class Editor {
         Editor(std::vector<std::string>* contents, const std::string& filename);
         int run_editor();
     private:
-        const static int OUTPUT_LINE_MAX = 10;
-
         std::vector<std::string>* m_contents;
         std::string m_filename;
         int m_current_line;
diff --git a/utils.cpp b/utils.cpp
index f118fc5..aa19c4f 100644
--- a/utils.cpp
+++ b/utils.cpp
@@ -2,6 +2,8 @@
 #include <unistd.h>   //_getch
 #include <termios.h>  //_getch
 #include <stdio.h>
+#include <sys/ioctl.h>
+#include <iostream>
 
 /* Thanks to StackOverflow user mf_ */
 char Utils::getch(){
@@ -24,4 +26,23 @@ char Utils::getch(){
         perror ("tcsetattr ~ICANON");
     //printf("%c\n",buf);
     return buf;
- }
+}
+
+int Utils::window_height() {
+    struct winsize w;
+    ioctl(STDOUT_FILENO, TIOCGWINSZ, &w);
+
+    return w.ws_row;
+}
+
+void Utils::clear_screen() {
+    int height = window_height();
+    for (int i = 0; i < height; i++) {
+        std::cout << '\n';
+    }
+}
+
+int Utils::count_digits(int num) {
+    std::string repr = std::to_string(num);
+    return repr.size();
+}
diff --git a/utils.h b/utils.h
index 35c600a..73703bc 100644
--- a/utils.h
+++ b/utils.h
@@ -3,6 +3,9 @@
 
 namespace Utils {
     char getch();
+    void clear_screen();
+    int window_height();
+    int count_digits(int num);
 }
 
 #endif
-- 
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