clangの警告オプション一覧表示スクリプト ref: http://qiita.com/kaityo256/items/a2ea1474973cd938c50c

diag.rb

list = Array.new

str = ""
while line=gets
  next if line=~/^\s*\/\//
  next if line.chomp.strip == ""
  str = str + line.chomp.strip
  if line=~/\;/
    list.push str
    str = ""
  end
end

class Diag
  def initialize(name, value, array)
    @name = name 
    @value = value
    @array = array
  end
  def isLeaf
    return @array == []
  end
  def show(aliasHash, diagHash, l=0)
    if @array == []
      l.times{print "  "}
      puts @name
    else 
      l.times{print "  "}
      puts @name
      @array.each{|v|
        name = aliasHash[v.strip]
        d = diagHash[name]
        d.show(aliasHash,diagHash,l+1) 
      }
    end
  end
end

diagHash = Hash.new
aliasHash = Hash.new

list.each{|line|
  if line=~/def(.*): DiagGroup<\"(.*)\".*,.*\[(.*)\]>/
    a = $1.strip
    name = $2.strip
    array = $3.split(/,/)
    d = Diag.new(name,a, array)
    diagHash[name] = d
    aliasHash[a] = name if a != ""
  elsif line=~/def (.*)\s*:\s*DiagGroup<\"(.*)\">/
    a = $1.strip
    name = $2.strip
    d = Diag.new(name, a, [])
    diagHash[name] = d
    aliasHash[a] = name if a != ""
  end
}

diagHash["all"].show(aliasHash, diagHash)

file1.txt

$ ruby diag.rb DiagnosticGroups.td 
all
  most
    char-subscripts
    comment
    delete-non-virtual-dtor
    format
      format-extra-args
      format-zero-length
      nonnull
      format-security
      format-y2k
      format-invalid-specifier
    implicit
      implicit-function-declaration
      implicit-int
    infinite-recursion
    mismatched-tags
    missing-braces
    move
      pessimizing-move
      redundant-move
      self-move
    multichar
    reorder
    return-type
      return-type-c-linkage
    self-assign
      self-assign-field
    self-move
    sizeof-array-argument
    sizeof-array-decay
    string-plus-int
    trigraphs
    uninitialized
      sometimes-uninitialized
      static-self-init
    unknown-pragmas
    unused
      unused-argument
      unused-function
        unneeded-internal-declaration
      unused-label
      unused-private-field
      unused-local-typedef
      unused-value
        unused-comparison
        unused-result
        unevaluated-expression
          potentially-evaluated-expression
      unused-variable
        unused-const-variable
      unused-property-ivar
    volatile-register-var
    objc-missing-super-calls
    objc-designated-initializers
    overloaded-virtual
    private-extern
    cast-of-sel-type
    extern-c-compat
  parentheses
    logical-op-parentheses
    logical-not-parentheses
    bitwise-op-parentheses
    shift-op-parentheses
    overloaded-shift-op-parentheses
    parentheses-equality
    dangling-else
  switch
  switch-bool