Save work on image support.

examples/md2pdf.c

@@ -20,6 +20,11 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#ifdef _WIN32
+#  include <io.h>
+#else
+#  include <unistd.h>
+#endif // _WIN32
 #include "mmd.h"
 #include <pdfio.h>
 #include <pdfio-content.h>
@@ -55,6 +60,14 @@ typedef struct docimage_s		// Document image info
 
 #define DOCIMAGE_MAX	1000		// Maximum number of images
 
+typedef struct doclink_s		// Document link info
+{
+  const char	*url;			// Reference URL
+  pdfio_rect_t	box;			// Link box
+} doclink_t;
+
+#define DOCLINK_MAX	1000		// Maximum number of links/page
+
 typedef struct docdata_s		// Document formatting data
 {
   pdfio_file_t	*pdf;			// PDF file
@@ -69,6 +82,9 @@ typedef struct docdata_s		// Document formatting data
   pdfio_stream_t *st;			// Current page stream
   double	y;			// Current position on page
   doccolor_t	color;			// Current color
+  pdfio_obj_t	*annots;		// Annotations object (for links)
+  size_t	num_links;		// Number of links for this page
+  doclink_t	links[DOCLINK_MAX];	// Links for this page
 } docdata_t;
 
 
@@ -128,6 +144,90 @@ static const char * const docfont_names[] =
 #define UNICODE_VALUE	true		// `true` for Unicode text, `false` for ISO-8859-1
 
 
+//
+// 'mmd_walk_next()' - Find the next markdown node.
+//
+
+static mmd_t *				// O - Next node or `NULL` at end
+mmd_walk_next(mmd_t *top,		// I - Top node
+              mmd_t *node)		// I - Current node
+{
+  mmd_t	*next,				// Next node
+	*parent;			// Parent node
+
+
+  // Figure out the next node under "top"...
+  if ((next = mmdGetFirstChild(node)) == NULL)
+  {
+    if ((next = mmdGetNextSibling(node)) == NULL)
+    {
+      if ((parent = mmdGetParent(node)) != top)
+      {
+	while ((next = mmdGetNextSibling(parent)) == NULL)
+	{
+	  if ((parent = mmdGetParent(parent)) == top)
+	    break;
+	}
+      }
+    }
+  }
+
+  return (next);
+}
+
+
+//
+// 'add_images()' - Scan the markdown document for images.
+//
+
+static void
+add_images(docdata_t *dd,		// I - Document data
+           mmd_t     *doc)		// I - Markdown document
+{
+  mmd_t	*current,			// Current node
+	*next;				// Next node
+
+
+  // Scan the entire document for images...
+  for (current = mmdGetFirstChild(doc); current; current = next)
+  {
+    // Get next node
+    next = mmd_walk_next(doc, current);
+
+    // Look for image nodes...
+    if (mmdGetType(current) == MMD_TYPE_IMAGE)
+    {
+      const char	*url,		// URL for image
+			*ext;		// Extension
+
+      url = mmdGetURL(current);
+      ext = strrchr(url, '.');
+
+      fprintf(stderr, "IMAGE(%s), ext=\"%s\"\n", url, ext);
+
+      if (!access(url, 0) && ext && (!strcmp(ext, ".png") || !strcmp(ext, ".jpg") || !strcmp(ext, ".jpeg")))
+      {
+        // Local JPEG or PNG file, so add it if we haven't already...
+        size_t		i;		// Looping var
+
+        for (i = 0; i < dd->num_images; i ++)
+        {
+          if (!strcmp(dd->images[i].url, url))
+            break;
+        }
+
+        if (i >= dd->num_images && dd->num_images < DOCIMAGE_MAX)
+        {
+          dd->images[i].url = url;
+          if ((dd->images[i].obj = pdfioFileCreateImageObjFromFile(dd->pdf, url, false)) != NULL)
+	    dd->num_images ++;
+        }
+      }
+    }
+  }
+}
+
+
 //
 // 'set_color()' - Set the stroke and fill color.
 //
@@ -286,10 +386,13 @@ format_block(docdata_t  *dd,		// I - Document data
   const char	*curtext,		// Current text
 		*cururl;		// Current URL, if any
   bool		curws;			// Current whitespace
+  pdfio_obj_t	*curimage;		// Current image, if any
+  char		curimagename[32];	// Current image name
   docfont_t	curface,		// Current font face
 		prevface;		// Previous font face
   double	x, y;			// Current position
   double	width,			// Width of current fragment
+		height,			// Height of current fragment
 		lwidth,			// Leader width
 		wswidth;		// Width of whitespace
   doccolor_t	color;			// Color of text
@@ -329,32 +432,35 @@ format_block(docdata_t  *dd,		// I - Document data
     // Get information about the current node...
     curtype         = mmdGetType(current);
     curtext         = mmdGetText(current);
+    curimage        = NULL;
+    curimagename[0] = '\0';
     cururl          = mmdGetURL(current);
     curws           = mmdGetWhitespace(current);
+    next            = mmd_walk_next(block, current);
 
-//    fprintf(stderr, "current=%p, curtype=%d, curtext=\"%s\", cururl=\"%s\", curws=%s\n", (void *)current, curtype, curtext, cururl, curws ? "true" : "false");
+    // Process the node...
+    if (curtype == MMD_TYPE_IMAGE && cururl)
+    {
+      // Embed an image
+      size_t	i;			// Looping var
 
-    // Figure out the next node under this block...
+      for (i = 0; i < dd->num_images; i ++)
-    if ((next = mmdGetFirstChild(current)) == NULL)
       {
-      if ((next = mmdGetNextSibling(current)) == NULL)
+        if (!strcmp(dd->images[i].url, cururl))
         {
-        mmd_t *parent;			// Parent node
+          curimage = dd->images[i].obj;
-
+          snprintf(curimagename, sizeof(curimagename), "I%u", (unsigned)i);
-        if ((parent = mmdGetParent(current)) != block)
-        {
-          while ((next = mmdGetNextSibling(parent)) == NULL)
-          {
-            if ((parent = mmdGetParent(parent)) == block)
           break;
         }
       }
-      }
-    }
 
-    // Process the node...
+      if (!curimage)
-    if (!curtext)
         continue;
+    }
+    else if (!curtext)
+    {
+      continue;
+    }
 
     if (curtype == MMD_TYPE_EMPHASIZED_TEXT)
       curface = DOCFONT_ITALIC;
@@ -372,7 +478,52 @@ format_block(docdata_t  *dd,		// I - Document data
     else
       color = DOCCOLOR_BLACK;
 
+    if (curimage)
+    {
+      // Image - treat as 100dpi
+      width  = 72.0 * pdfioImageGetWidth(curimage) / 100.0;
+      height = 72.0 * pdfioImageGetHeight(curimage) / 100.0;
+
+      if (width > (right - left))
+      {
+        // Too wide, scale to width...
+        width  = right - left;
+        height = width * pdfioImageGetHeight(curimage) / pdfioImageGetWidth(curimage);
+      }
+      else if (height > (dd->art_box.y2 - dd->art_box.y1))
+      {
+        // Too tall, scale to height...
+        height = dd->art_box.y2 - dd->art_box.y1;
+        width  = height * pdfioImageGetWidth(curimage) / pdfioImageGetHeight(curimage);
+      }
+
+      if (x <= left)
+      {
+        y -= height - fontsize * LINE_HEIGHT;
+
+	if (prevface != DOCFONT_MAX)
+	{
+	  pdfioContentTextEnd(dd->st);
+	  prevface = DOCFONT_MAX;
+	}
+
+	if (y < dd->art_box.y1)
+	{
+	  // New page...
+	  new_page(dd);
+
+	  x = left;
+	  y = dd->y - height;
+	}
+      }
+    }
+    else
+    {
+      // Text fragment...
       width  = pdfioContentTextMeasure(dd->fonts[curface], curtext, fontsize);
+      height = fontsize * LINE_HEIGHT;
+    }
+
     if (curws)
       wswidth = pdfioContentTextMeasure(dd->fonts[curface], " ", fontsize);
     else
@@ -382,7 +533,7 @@ format_block(docdata_t  *dd,		// I - Document data
     {
       // New line...
       x = left;
-      y -= fontsize * LINE_HEIGHT;
+      y -= height;
 
       if (y < dd->art_box.y1)
       {
@@ -395,7 +546,7 @@ format_block(docdata_t  *dd,		// I - Document data
 
         new_page(dd);
 
-        y = dd->y - fontsize * LINE_HEIGHT;
+        y = dd->y - height;
       }
       else
       {
@@ -404,6 +555,22 @@ format_block(docdata_t  *dd,		// I - Document data
       }
     }
 
+    fprintf(stderr, "curtext=\"%s\", curimage=\"%s\", x=%g, y=%g, width=%g, height=%g\n", curtext, curimagename, x, y, width, height);
+
+    if (curimage)
+    {
+      // Image
+      if (prevface != DOCFONT_MAX)
+      {
+	pdfioContentTextEnd(dd->st);
+	prevface = DOCFONT_MAX;
+      }
+
+      pdfioContentDrawImage(dd->st, curimagename, x, y, width, height);
+    }
+    else
+    {
+      // Text
       if (curface != prevface)
       {
 	if (prevface == DOCFONT_MAX)
@@ -428,6 +595,7 @@ format_block(docdata_t  *dd,		// I - Document data
 	pdfioContentTextShow(dd->st, UNICODE_VALUE, curtext);
 	x += width;
       }
+    }
 
     if (blocktype == MMD_TYPE_CODE_BLOCK)
     {
@@ -632,6 +800,9 @@ main(int  argc,				// I - Number of command-line arguments
       return (1);
   }
 
+  // Add images...
+  add_images(&dd, doc);
+
   // Parse the markdown document...
   format_doc(&dd, doc, dd.art_box.x1, dd.art_box.x2);
 

examples/md2pdf.md

@@ -0,0 +1,235 @@
+---
+title: Mini-Markdown Test Document
+...
+
+All heading levels are supported from 1 to 6, using both the ATX and Setext
+forms.  As an indented code block:
+
+    # Heading 1
+    ## Heading 2
+    ### Heading 3
+    #### Heading 4
+    ##### Heading 5
+    ###### Heading 6
+
+    Setext Heading 1
+    ================
+
+    Setext Heading 2
+    ----------------
+
+As block headings:
+
+# Heading 1
+## Heading 2
+### Heading 3
+#### Heading 4
+##### Heading 5
+###### Heading 6
+
+Setext Heading 1
+================
+
+Setext Heading 2
+----------------
+
+And block quotes:
+
+> # BQ Heading 1
+> ## BQ Heading 2
+> ### BQ Heading 3
+> #### BQ Heading 4
+> ##### BQ Heading 5
+> ###### BQ Heading 6
+>
+> Setext Heading 1
+> ================
+>
+> Setext Heading 2
+> ----------------
+
+And ordered lists:
+
+1. First item.
+
+2. Second item.
+
+3. Third item with very long text that wraps
+   across multiple lines.
+
+   With a secondary paragraph associated with
+   the third item.
+
+And unordered lists:
+
+- First item.
+
++ Second item.
+
+* Third item.
+
+* [ ] Fourth item (unchecked)
+
+- [x] Fifth item (checked)
+
+Code block with `\``:
+
+```
+#include <stdio.h>
+
+int main(void)
+{
+  puts("Hello, World!");
+  return (0);
+}
+~~~
+```
+
+Code block with `~`:
+
+~~~
+#include <stdio.h>
+
+int main(void)
+{
+  puts("Hello, World!");
+  return (0);
+}
+```
+~~~
+
+Link to [mmd web site](https://michaelrsweet.github.io/mmd).
+
+Normal link to [Heading 1](@).
+
+Code link to [`Heading 2`](@).
+
+Inner emphasized link to [*Heading 3*](@).
+
+Outer emphasized link to *[Heading 3](@)*.
+
+Inner strong link to [**Heading 4**](@).
+
+Outer strong link to **[Heading 4](@)**.
+
+Implicit link to [reference1][].
+
+Shortcut link to [reference1] without a link title.
+
+[reference1]: https://michaelrsweet.github.io/mmd 'MMD Home Page'
+
+[reference2]: https://michaelrsweet.github.io/mmd/mmd.html 'MMD Documentation'
+
+[reference3]: https://michaelrsweet.github.io/mmd/mmd-160.png "MMD Logo"
+
+Link to [mmd web site][reference1] works.
+Link to [mmd documentation][reference2] works.
+Link to ![mmd logo][reference3] image.
+Link to [bad reference][reference4] doesn't work.
+
+Autolink to <https://michaelrsweet.github.io/mmd>.
+
+Autolink in parenthesis (<https://michaelrsweet.github.io/mmd>).
+
+[Link broken
+across two lines](https://michaelrsweet.github.io/mmd)
+
+Color JPEG Image: ![Color JPEG Image](../testfiles/color.jpg)
+Grayscale JPEG Image: ![Grayscale JPEG Image](../testfiles/gray.jpg)
+Color PNG Image: ![Color PNG Image](../testfiles/pdfio-color.png)
+Grayscale PNG Image: ![Grayscale PNG Image](../testfiles/pdfio-gray.png)
+Indexed PNG Image: ![Indexed PNG Image](../testfiles/pdfio-indexed.png)
+
+This sentence contains *Emphasized Text*, **Bold Text**, and `Code Text` for
+testing the MMD parser.  The `<mmd.h>` header file.
+
+This sentence contains _Emphasized Text_, __Bold Text__, and
+~~Strikethrough Text~~ for testing the MMD parser.
+
+*Emphasized Text Split
+Across Two Lines*
+
+**Bold Text Split
+Across Two Lines**
+
+`Code Text Split
+Across Two lines`
+
+_Emphasized Text Split
+Across Two Lines_
+
+__Bold Text Split
+Across Two Lines__
+
+~~Strikethrough Text Split
+Across Two Lines~~
+
+All work and no play makes Johnny a dull boy.
+All work and no play makes Johnny a dull boy.
+All work and no play makes Johnny a dull boy.
+
+All work and no play makes Johnny a dull boy.
+All work and no play makes Johnny a dull boy.
+All work and no play makes Johnny a dull boy.
+
+\(Escaped Parenthesis)
+
+\(*Emphasized Parenthesis*)
+
+\(**Boldface Parenthesis**)
+
+\(`Code Parenthesis`)
+
+Escaped backtick (`\``)
+
+Table as code:
+
+    | Heading 1 | Heading 2 | Heading 3 |
+    | --------- | --------- | --------- |
+    | Cell 1,1  | Cell 1,2  | Cell 1,3  |
+    | Cell 2,1  | Cell 2,2  | Cell 2,3  |
+    | Cell 3,1  | Cell 3,2  | Cell 3,3  |
+
+Table with leading/trailing pipes:
+
+| Heading 1 | Heading 2 | Heading 3 |
+| --------- | --------- | --------- |
+| Cell 1,1  | Cell 1,2  | Cell 1,3  |
+| Cell 2,1  | Cell 2,2  | Cell 2,3  |
+| Cell 3,1  | Cell 3,2  | Cell 3,3  |
+
+Table without leading/trailing pipes:
+
+Heading 1 | Heading 2 | Heading 3
+--------- | --------- | ---------
+Cell 1,1  | Cell 1,2  | Cell 1,3
+Cell 2,1  | Cell 2,2  | Cell 2,3
+Cell 3,1  | Cell 3,2  | Cell 3,3
+
+Table with alignment:
+
+Left Alignment | Center Alignment | Right Alignment
+:-------- | :-------: | --------:
+Cell 1,1  | Cell 1,2  |        1
+Cell 2,1  | Cell 2,2  |       12
+Cell 3,1  | Cell 3,2  |      123
+
+Table in block quote:
+
+> Heading 1 | Heading 2 | Heading 3
+> --------- | --------- | ---------
+> Cell 1,1  | Cell 1,2  | Cell 1,3
+> Cell 2,1  | Cell 2,2  | Cell 2,3
+> Cell 3,1  | Cell 3,2  | Cell 3,3
+
+# Tests for Bugs/Edge Cases
+
+Paragraph with "|" that should not
+be interpreted as a table.
+
+    code before a bulleted list
+
+- First item
+- Second item
+- Some pathological nested link and inline style features supported by
+  CommonMark like "`******Really Strong Text******`".