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/*! \page emojisup Emoji support

The [Unicode consortium](http://www.unicode.org/) has defined a set of
[emoji](https://en.wikipedia.org/wiki/Emoji) with the corresponding unicode
sequences. Doxygen supports the subset of emoji characters as used by GitHub (based on the list
https://api.github.com/emojis).
An emoji is created using the \ref cmdemoji "\\emoji" command.
For example `\emoji smile` (or `\emoji :smile:`) both produce \emoji smile.

\section emojirep Representation

For the different doxygen output types there is an output defined:
- Unicode code sequence, the actual representation is depending on the possibilities of the fonts loaded:
  - HTML
  - DocBook
  - RTF, converted to UTF-16 representation.
- Image
  - \LaTeX, in case the image can be found (see \ref emojiimage "Emoji image retrieval") otherwise the plain emoji text (i.e. `:<text>:`) is displayed
- plain emoji text (i.e. `:<text>:`)
  - man
  - perl
- For XML there is a dedicated `<emoji>` tag with name and unicode attributes.

\section emojiimage Emoji image retrieval

In the list of images can be downloaded via the following Python script:
\code{.py}
# script to download the emoticons from GitHub and to produce a table for
# inclusion in doxygen. Works with python 2.7+ and python 3.x
import json
import os
import argparse
import re
try:
    import urllib.request as urlrequest
except ImportError:
    import urllib as urlrequest

unicode_re = re.compile(r'.*?/unicode/(.*?).png\?.*')

def get_emojis():
    response  = urlrequest.urlopen('https://api.github.com/emojis')
    raw_data  = response.read()
    return json.loads(raw_data)

def download_images(dir_name):
    json_data = get_emojis()
    num_items = len(json_data)
    cur_item=0
    for image,url in sorted(json_data.items()):
        image_name = image+'.png'
        cur_item=cur_item+1
        if url.find('/unicode/')==-1 or not os.path.isfile(dir_name+'/'+image_name):
            with open(dir_name+'/'+image_name,'wb') as file:
                print('%s/%s: fetching %s' % (cur_item,num_items,image_name))
                file.write(urlrequest.urlopen(url).read())
        else:
            print('%s/%s: skipping %s' % (cur_item,num_items,image_name))

def produce_table():
    json_data = get_emojis()
    lines = []
    for image,url in sorted(json_data.items()):
        match = unicode_re.match(url)
        if match:
            unicodes = match.group(1).split('-')
            unicodes_html = ''.join(["&#x"+x+";" for x in unicodes])
            image_str = "\":"+image+":\","
            unicode_str = "\""+unicodes_html+"\""
            lines.append('  { %-42s %-38s }' % (image_str,unicode_str))
    out_str = ',\n'.join(lines)
    print("{")
    print(out_str)
    print("};")

if __name__=="__main__":
    parser = argparse.ArgumentParser()
    group = parser.add_mutually_exclusive_group()
    group.add_argument('-d','--dir',help='directory to place images in')
    group.add_argument('-t','--table',help='generate code fragment',action='store_true')
    args = parser.parse_args()
    if args.table:
        produce_table()
    else:
        download_images(args.dir)

\endcode
When invoking it with the `-d image_dir` option the images will by downloaded in the `image_dir` directory.
By means of the doxygen configuration parameter
\ref cfg_latex_emoji_directory "LATEX_EMOJI_DIRECTORY" the requested directory can be selected.

For convenience a zip with the result of running the script can also be downloaded from
https://www.doxygen.nl/dl/github_emojis.zip

For an overview of the supported emoji one can issue the command:<br>
`doxygen -f emoji <outputFileName>`

\htmlonly
Go to the <a href="langhowto.html">next</a> section or return to the
 <a href="index.html">index</a>.
\endhtmlonly

*/