Inject auto-calculated wordcount

build.py

@@ -3,6 +3,8 @@ import argparse
 import pathlib
 import os
 import subprocess
+import re
+import tempfile
 
 
 CWD = pathlib.Path(os.getcwd())
@@ -10,15 +12,18 @@ BASE_DIR = pathlib.Path(os.path.dirname(os.path.abspath(__file__)))
 TEMPLATE_FILE = BASE_DIR / 'main.tex'
 OUTPUT_FILE = CWD / 'output.pdf'
 CONTEXT_FILE = CWD / 'context.yaml'
-BUILD_PASSES = 2
+WORDCOUNT_TEMPLATE = BASE_DIR / 'wordcount.yaml'
 
 
-def build(input_file: pathlib.Path):
+def build(input_file: pathlib.Path, additional_args=None):
     build_args = ['pandoc', str(input_file)]
 
     if CONTEXT_FILE.exists():
         build_args.append(str(CONTEXT_FILE))
 
+    if additional_args is not None:
+        build_args.extend(additional_args)
+
     build_args.extend([
         '--template',
         str(TEMPLATE_FILE),
@@ -28,12 +33,28 @@ def build(input_file: pathlib.Path):
     return subprocess.run(build_args, cwd=str(BASE_DIR), check=True)
 
 
-def parse_args(args=None):
+def get_word_count() -> int:
+    words = subprocess.check_output([
+        'pdftotext', str(OUTPUT_FILE), '-'
+    ], cwd=str(BASE_DIR))
+    return len(re.findall(r'\w+', words.decode()))
+
+
+def write_wordcount() -> pathlib.Path:
+    _, out_file_path = tempfile.mkstemp(suffix='.yaml')
+    wordcount = get_word_count()
+    with open(out_file_path, 'w') as out_file:
+        with WORDCOUNT_TEMPLATE.open() as template:
+            out_file.write(template.read().format(wordcount=wordcount))
+    return pathlib.Path(out_file_path)
+
+
+def parse_args():
     parser = argparse.ArgumentParser()
     parser.add_argument("-v", "--verbose", help="Set verbosity level (repeat argument)", action="count", default=0)
     parser.add_argument("input", help="Input File", action='store', type=pathlib.Path,)
     parser.add_help = True
-    return parser.parse_args(args=args)
+    return parser.parse_args()
 
 
 if __name__ == '__main__':
@@ -41,6 +62,6 @@ if __name__ == '__main__':
     input_file = args.input.resolve()
     if not input_file.is_file():
         raise ValueError("Failed to find {}".format(input_file))
-    for i in range(2):
-        print("Building pass {}.".format(i + 1))
     build(input_file)
+    wordcount_metadata_file = write_wordcount()
+    build(input_file, [str(wordcount_metadata_file)])

header-footer.tex

@@ -1,6 +1,6 @@
 \pagestyle{fancy}
 
-\rfoot{$wordcount$ words}
+\rfoot{\wordcount words}
 \cfoot{\thepage\ of \pageref{LastPage}}
 \lhead{\thetitle}
 \rhead{\date}

main.tex

@@ -1,6 +1,5 @@
 \documentclass[12pt,titlepage,a4paper,twoside]{article}
     \include{packages}
-    \include{header-footer}
 
     \renewcommand{\thesection}{}
     \renewcommand{\thesubsection}{\arabic{section}.\arabic{subsection}}
@@ -13,10 +12,11 @@
 
     \title{$title$}
     \newcommand{\subtitle}{$subtitle$}
+    \newcommand{\wordcount}{$wordcount$}
     \author{Some Author}
     \date{2018-01-01}
 
-
+    \include{header-footer}
 
     \begin{document}
 

wordcount.yaml

@@ -0,0 +1,3 @@
+---
+wordcount: {wordcount}
+...