implement a basic linter

Currently it just checks if the kernel doesn't accidentally use
arch-dependent headers.

1 files changed, 28 insertions, 0 deletions

diff --git a/tools/linter/main.rb b/tools/linter/main.rb
new file mode 100755
index 0000000..1198fd1
--- /dev/null
+++ b/tools/linter/main.rb
@@ -0,0 +1,28 @@
+#!/usr/bin/env ruby
+# must be run in the root directory of the repo
+# currently it only checks if code in src/kernel/ uses anything arch-dependent
+
+$return = 0
+
+def warn(msg)
+  STDERR.puts "[LINTER] #{msg}"
+  $return = 1
+end
+
+whitelist = ["arch/generic.h"]
+
+Dir["src/kernel/**.?"]
+  .each do |path|
+    File.read(path)
+      .lines
+      .map(&:strip)                          # strip whitespace
+      .filter{|line| line[0] == '#'}         # find preprocessor directives
+      .map{|line| line[1..].strip}           # get rid of the #, strip again
+      .filter{|l| l.start_with? "include"}   # find includes
+      .map{|l| /([<"](.+)[">])/.match(l)[2]} # get the name of the included file
+      .filter{|l| l.start_with? "arch/"}     # find files in arch/
+      .filter{|l| not whitelist.include? l}  # filter out whitelisted headers
+      .each{|inc| warn "#{path} includes #{inc}"}
+  end
+
+exit $return