Emoji support

The Unicode consortium has defined a set of 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 \emoji command. For example \emoji smile (or \emoji :smile:) both produce 😄.

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
  • , in case the image can be found (see 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.

Emoji image retrieval

In the list of images can be downloaded via the following Python script:

# 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):
    if not os.path.exists(dir_name):
        os.makedirs(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)

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 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:
doxygen -f emoji <outputFileName>

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