finished start formatting, added preview script

1 files changed, 123 insertions, 0 deletions

diff --git a/parser.py b/parser.py
new file mode 100644
index 0000000..8677342
--- /dev/null
+++ b/parser.py
@@ -0,0 +1,123 @@
+import argparse
+from urllib.parse import urlparse
+import webbrowser
+import app
+import re
+import os
+
+HEADER_INCREMENTER = 1
+IMAGE_TYPES = [".png", ".jpg"]
+
+def parse_file(path):
+    with open(path, "r") as f:
+        unformatted = f.read()
+
+    formatted = parse_headers(unformatted)
+    formatted = parse_asteriscs(formatted)
+    formatted = parse_links(formatted)
+    formatted = add_linebreaks(formatted)
+
+    return '{% extends "template.html" %}\n{% block content %}\n' + formatted + '\n{% endblock %}'
+
+def parse_headers(test_str):
+    regex = r"^#{1,5}\s\w.*$"
+    matches = re.finditer(regex, test_str, re.MULTILINE)
+    offset = 0
+
+    for match in matches:
+        # work out if its h2, h3 etc. from the number of #s
+        headerNo = len(match.group().split(" ")[0]) + HEADER_INCREMENTER
+        
+        replacement = "<h%i>%s</h%i>" % (headerNo, " ".join(match.group().split(" ")[1:]), headerNo)
+
+        #don't use .replace() in the unlikely case the the regex hit appears in a block
+        test_str = test_str[:match.start()+offset] + replacement + test_str[match.end()+offset:]
+        #replacing the hits fucks up the indexes, accommodate for this
+        offset += (len(replacement) - (match.end() - match.start()))
+
+    return test_str
+
+def parse_asteriscs(test_str):
+    regex = r"(?<!\\)\*{1,3}.*?\*{1,3}"
+    matches = re.finditer(regex, test_str, re.MULTILINE)
+    offset = 0
+
+    for match in matches:
+        if len(re.findall(r"\*{1,3}.*?\\\*{1,3}", match.group())) == 0:     #need to find a way of doing this with regexes
+            if match.group().startswith(re.findall(r"\w\*{1,3}", match.group())[0][1:]):    #this too
+                if match.group().startswith("***"):
+                    replacement = "<b><i>%s</i></b>" % (match.group()[3:-3])
+                elif match.group().startswith("**"):
+                    replacement = "<b>%s</b>" % (match.group()[2:-2])
+                else:
+                    replacement = "<i>%s</i>" % (match.group()[1:-1])
+        
+                test_str = test_str[:match.start()+offset] + replacement + test_str[match.end()+offset:]
+                offset += (len(replacement) - (match.end() - match.start()))
+
+    return test_str
+
+def parse_links(test_str):
+    regex = r"(?<!\\)\[.*?\]\(http[s]?://(?:[a-zA-Z]|[0-9]|[$-_@.&+]|[!*\(\),]|(?:%[0-9a-fA-F][0-9a-fA-F]))+\)"
+    matches = re.finditer(regex, test_str, re.MULTILINE)
+    offset = 0
+
+    for match in matches:
+        s = match.group().split("(")
+        label = s[0][1:-1]
+        url = s[1][:-1]
+
+        if os.path.splitext(urlparse(url).path)[1] in IMAGE_TYPES:
+            replacement = "<img alt='%s' src=%s>" % (label, url)
+        else:
+            replacement = "<a href=%s>%s</a>" % (url, label)
+
+        test_str = test_str[:match.start()+offset] + replacement + test_str[match.end()+offset:]
+        offset += (len(replacement) - (match.end() - match.start()))
+
+    return test_str
+
+def add_linebreaks(test_str):
+    return re.sub(r"^$", "<br><br>", test_str, 0, re.MULTILINE)
+
+def preview_markdown(path, title):
+    def startBrowser():
+        webbrowser.get("firefox").open("http://localhost:5000/preview")
+        del os.environ["PREVIEW"]
+        del os.environ["PREVIEW_TITLE"]
+
+    os.environ["PREVIEW"] = parse_file(path)
+    os.environ["PREVIEW_TITLE"] = title
+
+    import threading
+    threading.Timer(1.25, startBrowser ).start()
+    
+    app.app.run(host = "0.0.0.0", debug = True)
+
+def main():
+    p = argparse.ArgumentParser()
+    p.add_argument(
+        "-m", "--markdown",
+        help = "Path to a markdown file",
+        required = True,
+        type = str
+    )
+    p.add_argument(
+        "-t", "--title",
+        help = "Article title",
+        required = True,
+        type = str
+    )
+    p.add_argument(
+        "-p", "--preview",
+        help = "Preview markdown rendering",
+        action='store_true'
+    )
+    args = vars(p.parse_args())
+    if args["preview"]:
+        preview_markdown(args["markdown"], args["title"])
+    else:
+        print(parse_file(args["markdown"]))
+
+if __name__ == "__main__":
+    main()
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