rework max_lines/cols detection to support line wrapping (#15 part 1)

visit1985 · Sep 27, 2014 · c6516c7 · c6516c7
1 parent a1d883f
commit c6516c7
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Showing 3 changed files with 61 additions and 20 deletions.
diff --git a/include/parser.h b/include/parser.h
@@ -48,6 +48,7 @@ void markdown_debug(deck_t *deck, int debug);
 int is_utf8(char ch);
 int length_utf8(char ch);
 int next_nonblank(cstring_t *text, int i);
+int prev_blank(cstring_t *text, int i);
 int next_blank(cstring_t *text, int i);
 int next_word(cstring_t *text, int i);
 

diff --git a/src/parser.c b/src/parser.c
@@ -501,6 +501,13 @@ int next_nonblank(cstring_t *text, int i) {
     return i;
 }
 
+int prev_blank(cstring_t *text, int i) {
+    while ((i > 0) && !isspace((unsigned char) (text->text)[i]))
+        i--;
+
+    return i;
+}
+
 int next_blank(cstring_t *text, int i) {
     while ((i < text->size) && !isspace((unsigned char) (text->text)[i]))
         i++;

diff --git a/src/viewer.c b/src/viewer.c
@@ -65,6 +65,7 @@ int ncurses_display(deck_t *deck, int notrans, int nofade, int invert) {
     int c = 0;          // char
     int i = 0;          // iterate
     int l = 0;          // line number
+    int lc = 0;         // line count
     int sc = 1;         // slide count
     int colors = 0;     // amount of colors supported
     int fade = 0;       // disable color fading by default
@@ -82,39 +83,71 @@ int ncurses_display(deck_t *deck, int notrans, int nofade, int invert) {
     slide_t *slide = deck->slide;
     line_t *line;
 
+    // set locale to display UTF-8 correctly in ncurses
+    setlocale(LC_CTYPE, "");
+
+    // init ncurses
+    initscr();
+
     while(slide) {
-        // set max_lines if line count exceeded
-        max_lines = (slide->lines > max_lines) ? slide->lines : max_lines;
+        lc = 0;
         line = slide->line;
+
         while(line) {
-            // set max_cols if length exceeded
-            max_cols = (line->length > max_cols) ? line->length : max_cols;
+            if(line->length > COLS) {
+                i = line->length;
+                offset = 0;
+                while(i > COLS) {
+
+                    i = prev_blank(line->text, offset + COLS) - offset;
+
+                    // single word is > COLS
+                    if(!i) {
+                        // calculate min_width
+                        i = next_blank(line->text, offset + COLS) - offset;
+
+                        // disable ncurses
+                        endwin();
+
+                        // print error
+                        fprintf(stderr, "Error: Terminal width (%i columns) too small. Need at least %i columns.\n", COLS, i);
+                        fprintf(stderr, "You may need to shorten some lines by inserting line breaks.\n");
+
+                        return(1);
+                    }
+
+                    // set max_cols
+                    max_cols = (i > max_cols) ? i : max_cols;
+
+                    // iterate to next line
+                    offset = prev_blank(line->text, offset + COLS);
+                    i = line->length - offset;
+                    lc++;
+                }
+                // set max_cols one last time
+                max_cols = (i > max_cols) ? i : max_cols;
+            } else {
+                // set max_cols
+                max_cols = (line->length > max_cols) ? line->length : max_cols;
+            }
+            lc++;
             line = line->next;
         }
-        slide = slide->next;
-    }
 
-    // set locale to display UTF-8 correctly in ncurses
-    setlocale(LC_CTYPE, "");
+        max_lines = (lc > max_lines) ? lc : max_lines;
 
-    // init ncurses
-    initscr();
+        slide = slide->next;
+    }
 
-    if((max_cols > COLS) ||
-       (max_lines + bar_top + bar_bottom + 2 > LINES)) {
+    // not enough lines
+    if(max_lines + bar_top + bar_bottom > LINES) {
 
         // disable ncurses
         endwin();
 
         // print error
-        fprintf(stderr, "Error: Terminal size %ix%i too small. Need at least %ix%i.\n",
-            COLS, LINES, max_cols, max_lines + bar_top + bar_bottom + 2);
-
-        // print hint to solve it
-        if(max_lines + bar_top + bar_bottom + 2 > LINES)
-            fprintf(stderr, "You may need to add additional horizontal rules ('***') to split your file in shorter slides.\n");
-        if(max_cols > COLS)
-            fprintf(stderr, "Automatic line wrapping is not supported yet. You may need to shorten some lines by inserting line breaks.\n");
+        fprintf(stderr, "Error: Terminal heigth (%i lines) too small. Need at least %i lines.\n", LINES, max_lines + bar_top + bar_bottom);
+        fprintf(stderr, "You may need to add additional horizontal rules ('***') to split your file in shorter slides.\n");
 
         return(1);
     }