From 31eb213da6e050f77ccaf59626484a03f1b95af6 Mon Sep 17 00:00:00 2001
From: =?utf8?q?Michael=20G=C3=B6hler?= <somebody.here@gmx.de>
Date: Fri, 12 Sep 2014 00:42:37 +0200
Subject: [PATCH] added cstack to viewer + implemented inline highlighting

---
 include/viewer.h |  3 ++
 sample.md        |  4 +--
 viewer.c         | 86 +++++++++++++++++++++++++++++++++++++++++++++---
 3 files changed, 86 insertions(+), 7 deletions(-)

diff --git a/include/viewer.h b/include/viewer.h
index 52a2296..c4f4175 100644
--- a/include/viewer.h
+++ b/include/viewer.h
@@ -3,6 +3,8 @@
 
 #include <ncurses.h>
 
+#include "cstack.h"
+
 #define CP_WHITE  1 // 255
 #define CP_BLUE   2 // 123
 #define CP_RED    3 // 213
@@ -12,6 +14,7 @@
 
 int ncurses_display(deck_t *deck, int notrans, int nofade);
 void add_line(WINDOW *window, int y, int x, line_t *line, int max_cols);
+int is_attron(cstack_t *stack, char c);
 void fade_out(WINDOW *window, int trans, int colors);
 void fade_in(WINDOW *window, int trans, int colors);
 
diff --git a/sample.md b/sample.md
index 2f83e53..afb8066 100644
--- a/sample.md
+++ b/sample.md
@@ -16,7 +16,7 @@ And two backslashes: \\\\
 
 # Page 2
 
-This is another test page.
+This is _another_ test page.
 
 * * *
 
@@ -27,7 +27,7 @@ This is another test page.
         printf("%s\n", "hello");
     }
 
-Now with different indentation.
+Now with *different* indentation.
 
 	function expand_tab {
         printf("%s\n", "hello");
diff --git a/viewer.c b/viewer.c
index 0f5d928..2d64b4e 100644
--- a/viewer.c
+++ b/viewer.c
@@ -1,5 +1,6 @@
 #include <ncurses.h>
 #include <stdlib.h>
+#include <string.h> // strchr
 #include <unistd.h>
 
 #include "include/parser.h"
@@ -229,6 +230,9 @@ int ncurses_display(deck_t *deck, int notrans, int nofade) {
 
 void add_line(WINDOW *window, int y, int x, line_t *line, int max_cols) {
     int i = 0; // increment
+    char *c; // char pointer for iteration
+    char *special = "\\*_"; // list of interpreted chars
+    cstack_t *stack = cstack_init();
 
     if(line->text->text) {
         int offset = 0; // text offset
@@ -281,11 +285,71 @@ void add_line(WINDOW *window, int y, int x, line_t *line, int max_cols) {
                 wattroff(window, A_UNDERLINE);
 
             } else {
-                //TODO for each char in line
-                    //TODO if *|_ highlight (maybe use a stack here?)
-                mvwprintw(window,
-                      y, x,
-                      "%s", &line->text->text[offset]);
+                // move the cursor in position
+                wmove(window, y, x);
+
+                // for each char in line
+                c = line->text->text;
+                while(*c) {
+
+                    // if char is in special char list
+                    if(strchr(special, *c)) {
+
+                        // closing special char (or second backslash)
+                        if(is_attron(stack, *c)) {
+
+                            switch(*c) {
+                                // print escaped backslash
+                                case '\\':
+                                    wprintw(window, "%c", *c);
+                                    break;
+                                // disable highlight
+                                case '*':
+                                    wattron(window, COLOR_PAIR(CP_WHITE));
+                                    break;
+                                // disable underline
+                                case '_':
+                                    wattroff(window, A_UNDERLINE);
+                                    break;
+                            }
+
+                            // remove top special char from stack
+                            (stack->pop)(stack);
+
+                        // treat special as regular char
+                        } else if(is_attron(stack, '\\')) {
+                            wprintw(window, "%c", *c);
+
+                            // remove backslash from stack
+                            (stack->pop)(stack);
+
+                        // opening special char
+                        } else {
+                            switch(*c) {
+                                // enable highlight
+                                case '*':
+                                    wattron(window, COLOR_PAIR(CP_RED));
+                                    break;
+                                // enable underline
+                                case '_':
+                                    wattron(window, A_UNDERLINE);
+                                    break;
+                                // do nothing for backslashes
+                            }
+
+                            // push special char to stack
+                            (stack->push)(stack, *c);
+                        }
+
+                    } else {
+                        // print regular char
+                        wprintw(window, "%c", *c);
+                    }
+
+                    c++;
+                }
+
+                //TODO pop stack until empty
             }
         }
 
@@ -298,6 +362,18 @@ void add_line(WINDOW *window, int y, int x, line_t *line, int max_cols) {
         wattroff(window, A_UNDERLINE);
         wattroff(window, A_REVERSE);
     }
+
+    (stack->delete)(stack);
+}
+
+int is_attron(cstack_t *stack, char c) {
+    // test if char is on top of stack
+    if(stack->head >= 0) {
+        if((stack->top)(stack) == c) {
+            return 1;
+        }
+    }
+    return 0;
 }
 
 void fade_out(WINDOW *window, int trans, int colors) {
-- 
2.20.1