List the tools in the README.

README.md

@@ -22,3 +22,50 @@ To run on an older ubuntu you can checkout an older version of vigil.
 e.g. After cloning do:
 
     # git checkout ubuntu-15.10
+
+### Tools
+
+#### py
+    python_syntax python_unittests pydoc mypy python_coverage python_profile pycodestyle pyflakes pylint python_gut python_modulefinder python_mccabe bandit
+
+#### pyc
+    disassemble_pyc
+
+#### pl pm t
+    perl_syntax perldoc perltidy
+
+#### pod pod6
+    perldoc
+
+#### java
+    uncrustify
+
+#### c h
+    splint uncrustify
+
+#### o
+    objdump_headers objdump_disassemble readelf
+
+#### cpp
+    bcpp uncrustify
+
+#### pdf
+    pdf2txt
+
+#### html
+    html_syntax tidy html2text
+
+#### php
+    php5_syntax
+
+#### zip
+    unzip
+
+#### tar.gz tgz
+    tar_gz
+
+#### tar.bz2
+    tar_bz2
+
+#### a so
+    nm

make-readme.py

@@ -0,0 +1,40 @@
+#!/usr/bin/env python3
+
+
+import tools
+
+
+BODY = """\
+# Vigil Code Monitor
+
+### Summary
+
+Vigil shows a list of status reports for a given codebase, and keeps them
+up to date as the codebase changes.
+
+### Installation
+
+To run vigil:  (Tested in Ubuntu 16.10 in gnome-terminal and stterm)
+
+    # git clone https://github.com/ahamilton/vigil
+    # cd vigil
+    # ./install-dependencies
+    # ./vigil <directory_path>
+
+and to test its working properly:
+
+    # ./test-all
+
+To run on an older ubuntu you can checkout an older version of vigil.
+e.g. After cloning do:
+
+    # git checkout ubuntu-15.10
+
+### Tools"""
+
+
+print(BODY)
+for extensions, tools_ in tools.TOOLS_FOR_EXTENSIONS:
+    print()
+    print("#### " + " ".join(extensions))
+    print("    " + " ".join(tool.__name__ for tool in tools_))

tools.py

@@ -707,34 +707,36 @@ def _generic_tools():
     return [contents, metadata]
 
 
+TOOLS_FOR_EXTENSIONS = \
+    [
+        (["py"], [python_syntax, python_unittests, pydoc, mypy, python_coverage,
+                  python_profile, pycodestyle, pyflakes, pylint, python_gut,
+                  python_modulefinder, python_mccabe, bandit]),
+        (["pyc"], [disassemble_pyc]),
+        (["pl", "pm", "t"], [perl_syntax, perldoc, perltidy]),
+        # (["p6", "pm6"], [perl6_syntax, perldoc]),
+        (["pod", "pod6"], [perldoc]),
+        (["java"], [uncrustify]),
+        (["c", "h"], [splint, uncrustify]),
+        (["o"], [objdump_headers, objdump_disassemble, readelf]),
+        (["cpp"], [bcpp, uncrustify]),
+        (["pdf"], [pdf2txt]),
+        (["html"], [html_syntax, tidy, html2text]),
+        (["php"], [php5_syntax]),
+        (["zip"], [unzip]),
+        (["tar.gz", "tgz"], [tar_gz]),
+        (["tar.bz2"], [tar_bz2]),
+        (["a", "so"], [nm]),
+    ]
+
+
+@functools.lru_cache(maxsize=1)
 def _tools_for_extension():
-    return {
-        "py": [python_syntax, python_unittests, pydoc, mypy, python_coverage,
-               python_profile, pycodestyle, pyflakes, pylint, python_gut,
-               python_modulefinder, python_mccabe, bandit],
-        "pyc": [disassemble_pyc],
-        "pl": [perl_syntax, perldoc, perltidy],
-        "pm": [perl_syntax, perldoc, perltidy],
-        "t": [perl_syntax, perldoc, perltidy],
-        # "p6": [perl6_syntax, perldoc],
-        # "pm6": [perl6_syntax, perldoc],
-        "pod": [perldoc],
-        "pod6": [perldoc],
-        "java": [uncrustify],
-        "c": [splint, uncrustify],
-        "h": [splint, uncrustify],
-        "o": [objdump_headers, objdump_disassemble, readelf],
-        "zip": [unzip],
-        "tar.gz": [tar_gz],
-        "tgz": [tar_gz],
-        "tar.bz2": [tar_bz2],
-        "a": [nm],
-        "so": [nm],
-        "pdf": [pdf2txt],
-        "html": [html_syntax, tidy, html2text],
-        "cpp": [bcpp, uncrustify],
-        "php": [php5_syntax],
-    }
+    result = {}
+    for extensions, tools in TOOLS_FOR_EXTENSIONS:
+        for extension in extensions:
+            result[extension] = tools
+    return result
 
 
 def tools_all():