Contents

#!/usr/bin/env ruby
# Given:
#   --- languages-v1.tsv ---
#   id	name	author	first_appeared	stable_release
#   1	ruby	Yukihiro Matsumoto	1995	2.7.1
#   2	python	Guido van Rossum	1991	3.9.0
#   3	jq	Stephen Dolan	2013	1.6
#   --- languages-v1.tsv ---
#
#   --- languages-v2.tsv ---
#   id	name	author	first_appeared	stable_release
#   1	ruby	Yukihiro Matsumoto	1995	2.7.2
#   2	python	Guido van Rossum	1991	3.9.0
#   3	jq	Stephen Dolan	2013	1.6
#   --- languages-v2.tsv ---
#
# Examples:
#   > diff-csv languages-v1.tsv languages-v2.tsv
#   {
#     1=>{
#       "stable_release"=>- "2.7.1"+ "2.7.2"
#     }
#   }
#   Where, - 1 missing, + 1 additional
#
#   > VERBOSE=1 diff-csv languages-v{1,2}.tsv
#   {
#     1=>{
#       "name"=>"ruby",
#       "author"=>"Yukihiro Matsumoto",
#       "first_appeared"=>1995,
#       "stable_release"=>- "2.7.1"+ "2.7.2"
#     },
#     2=>{
#       "name"=>"python",
#       "author"=>"Guido van Rossum",
#       "first_appeared"=>1991,
#       "stable_release"=>"3.9.0"
#     },
#     3=>{
#       "name"=>"jq",
#       "author"=>"Stephen Dolan",
#       "first_appeared"=>2013,
#       "stable_release"=>1.6
#     }
#   }
#   Where, - 1 missing, + 1 additional
#
#   > KEY=name diff-csv languages-v{1,2}.tsv
#   {
#     "ruby"=>{
#       "stable_release"=>- "2.7.1"+ "2.7.2"
#     }
#   }
#   Where, - 1 missing, + 1 additional

require 'csv'
require 'diff_matcher/cli'

COL_SEP=ENV.fetch("COL_SEP", "\t")
KEY=ENV.fetch("KEY", "id")


def fix_nulls(h)
  h.each { |k, v| h[k] = (v == 'NULL' ? nil : v) }
end

def records(file, key=KEY, col_sep=COL_SEP)
  CSV(file, col_sep: COL_SEP, headers: true, converters: :all).inject({}) do |h, row|
    data = fix_nulls(row.to_hash)
    h.update(data.delete(key)=> data)
  end
end

DiffMatcher::CLI.diff(
  records(File.open(ARGV[0])),
  records(File.open(ARGV[1]))
)

Version data entries

2 entries across 2 versions & 1 rubygems

Version	Path
diff_matcher-2.9.0	exe/diff-csv
diff_matcher-2.8.1	exe/diff-csv