added cstack to viewer + implemented inline highlighting
[smdp.git] / viewer.c
index 6dac23b..2d64b4e 100644 (file)
--- 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"
@@ -160,7 +161,7 @@ int ncurses_display(deck_t *deck, int notrans, int nofade) {
 
         // print lines
         while(line) {
-            add_line(content, l, (COLS - max_cols) / 2, line);
+            add_line(content, l, (COLS - max_cols) / 2, line, max_cols);
             line = line->next;
             l++;
         }
@@ -172,6 +173,9 @@ int ncurses_display(deck_t *deck, int notrans, int nofade) {
         if(fade)
             fade_in(content, trans, colors);
 
+        // re-enable fading after any undefined key press
+        if(COLORS == 256 && !nofade) fade = 1;
+
         // wait for user input
         c = getch();
 
@@ -207,6 +211,11 @@ int ncurses_display(deck_t *deck, int notrans, int nofade) {
                 fade = 0;
                 slide = (void*)0;
                 break;
+
+            default:
+                // disable fading on undefined key press
+                fade = 0;
+                break;
         }
 
         // fade out
@@ -219,15 +228,152 @@ int ncurses_display(deck_t *deck, int notrans, int nofade) {
     return(0);
 }
 
-void add_line(WINDOW *window, int y, int x, line_t *line) {
+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
         offset = next_nonblank(line->text, 0);
-        // print line to window
-        mvwprintw(window,
-                  y, x,
-                  "%s", &line->text->text[offset]);
+
+        // IS_CODE
+        if(CHECK_BIT(line->bits, IS_CODE)) {
+
+            // set static offset for code
+            offset = CODE_INDENT;
+
+            // reverse color for code blocks
+            wattron(window, A_REVERSE);
+
+            // print whole lines
+            mvwprintw(window,
+                      y, x,
+                      "%s", &line->text->text[offset]);
+
+        // IS_QUOTE
+        } else if(CHECK_BIT(line->bits, IS_QUOTE)) {
+            //TODO replace greater sign with color block
+
+            //FIXME remove dummy print code
+            mvwprintw(window,
+                      y, x,
+                      "%s", &line->text->text[offset]);
+
+        } else {
+
+            // IF_H1 || IF_H2
+            if(CHECK_BIT(line->bits, IS_H1) || CHECK_BIT(line->bits, IS_H2)) {
+
+                // set headline color
+                wattron(window, COLOR_PAIR(CP_BLUE));
+
+                // enable underline for H1
+                if(CHECK_BIT(line->bits, IS_H1))
+                    wattron(window, A_UNDERLINE);
+
+                // skip hashes
+                while(line->text->text[offset] == '#')
+                    offset = next_word(line->text, offset);
+
+                // print whole lines
+                mvwprintw(window,
+                      y, x,
+                      "%s", &line->text->text[offset]);
+
+                wattroff(window, A_UNDERLINE);
+
+            } else {
+                // 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
+            }
+        }
+
+        // fill rest off line with spaces
+        for(i = getcurx(window) - x; i < max_cols; i++)
+            wprintw(window, "%s", " ");
+
+        // reset to default color
+        wattron(window, COLOR_PAIR(CP_WHITE));
+        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) {