auto toc help

reporting/md-toc

@@ -4,9 +4,24 @@ import argparse
 import sys
 import re
 
+
 def get_opts():
 
-    parser = argparse.ArgumentParser(description="TOC for markdown.")
+    parser = argparse.ArgumentParser(
+        description="TOC for markdown.",
+        epilog="""Automatic TOC guide:
+Add these hidden comments in the markdown:
+[TOCSTART]: #
+[TOCEND]: #
+
+Then, use this command to generate TOC: (make a backup first...)
+    sed -i -n \\
+        -e '1,/^\[TOCSTART\]: #/p;/^\[TOCEND\]: #/,$p' \\
+        -e '/^\[TOCSTART\]: #/r '<( md-toc document.md ) \\
+        document.md
+""",
+        formatter_class=argparse.RawTextHelpFormatter,
+    )
     parser.add_argument("-n", help="Number TOC", action="store_true")
     parser.add_argument("-l", help="TOC as links", action="store_true")
     parser.add_argument(
@@ -30,12 +45,12 @@ def main():
     bullet = "-"
     counters = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0]
     lastlev = 0
-    re_anchor = re.compile('[^0-9a-z-]')
+    re_anchor = re.compile("[^0-9a-z-]")
     for row in fp:
         if row.startswith("#"):
             headers, title = row.strip().split(" ", 1)
             if opts.l:
-                anchor = re_anchor.sub('' , title.lower().replace(" ", "-"))
+                anchor = re_anchor.sub("", title.lower().replace(" ", "-"))
                 title = "[{}](#{})".format(title, anchor)
             pad = headers.count("#") - 1
             if pad < lastlev: