tools: Added shellcheck for bash, sh, dash or ksh files.

README.md

@@ -41,3 +41,4 @@ Extensions | Tools
 .tar.bz2 | [tar_bz2](http://www.gnu.org/software/tar/manual/tar.html)
 .a .so | [nm](https://linux.die.net/man/1/nm)
 .png .jpg .gif .bmp .ppm .tiff .tga | [pil](http://python-pillow.github.io/) • [pil_half](http://python-pillow.github.io/)
+.bash .sh .dash .ksh | [shellcheck](http://hackage.haskell.org/package/ShellCheck)

TODO

@@ -6,7 +6,6 @@ Todo (tool related)
 - Report on python doctests. (also coverage of)
 - Cache tools._python_version.
 - Colourise git_diff.
-- Add shellcheck tool for shell scripts.
 
 
 Done
@@ -166,6 +165,7 @@ Done
 - Add bandit tool for python.
 - Created a setup.py file.
 - Add cppcheck tool for C and C++.
+- Add shellcheck tool for shell scripts.
 
 A-syntax, B-tests, C-auto docs, D-lint, E-coverage, F-profile, G-tidy, H-import deps
              A B C D E F G H

vigil/tools.py

@@ -675,6 +675,11 @@ def pil_half(path):
     return Status.normal, result
 
 
+@deps(deps={"shellcheck"}, url="shellcheck", executables={"shellcheck"})
+def shellcheck(path):
+    return _run_command(["shellcheck", path])
+
+
 @deps(deps={"git"}, url="git", executables={"git"})
 def git_blame(path):  # FIX: Add to tools_test.py
     stdout, stderr, returncode = _do_command(
@@ -830,7 +835,8 @@ TOOLS_FOR_EXTENSIONS = \
         (["tar.gz", "tgz"], [tar_gz]),
         (["tar.bz2"], [tar_bz2]),
         (["a", "so"], [nm]),
-        (IMAGE_EXTENSIONS, [pil, pil_half])
+        (IMAGE_EXTENSIONS, [pil, pil_half]),
+        (["bash", "sh", "dash", "ksh"], [shellcheck])
     ]