npm install -g humandiff

Usage: humandiff [options] <oldFile> <newFile> [oldFileLabel] [newFileLabel]

Human readable "diff" tool with no data loss.

  Differenced sections are labeled with oldFileLabel and newFileLabel if provided.

  File path is used otherwise.


Options:

  -V, --version                      output the version number
  -o, --acceptOld <cfgOptions_list>  Comma-separated list of options to automatically accept old version
  -n, --acceptNew <cfgOptions_list>  Comma-separated list of options to automatically accept new version
  -i, --ignoreCase                   Perform case-insensitive comparsion
  -h, --help                         output usage information


Exit statuses:
   Possible return status codes are:

      0: Ok
         Compare files are identical (~diff)
         ...OR if conflicts were automatically resolved.
      1: Conflict
         Files differ (~diff)
         ...AND conflicts couldn't automatically resolved.
            (Output file needs human review)
      2: Binary
         Tryed to compare binary file (=diff)
         (RESERVED, but Not yet used)
      5: Error
         Some error happened.
         (Details logged to stderr)

   NOTE: Defined as close as possible to diff exit status.
   See: http://tldp.org/LDP/abs/html/filearchiv.html#DIFFERR2


Advanced features:

  Automated resolution:
      Given any differnce section, if it consists in single row both sides
      and both consists in property definiton of the form 'propName = xxxx'.
      If propName is present on --acceptOld or --acceptNew list, proper
      version is automatically selected (printed) and no conflict block is
      rendered. It also works if property is not present either side (was
      removed or added in newFile) or, sometimes, even if its position changes
      (removed from its original position and added in another place).

  Case insensitive comparsion:
      if --ignoreCase option (or -i) option is used, case-insensitive
      comparsion is performed. In this mode, propNames in --acceptOld and
      --acceptNew are threaten in case insensitive manner so, for example
      "someoption" and "SomeOption" property names are considered the same
      and thus selected version is picked (in its original case). In case of
      rows with no other difference than upper/lower-case letters, oldFile
      verison is used

  Diff example file.

  This row is the same.

  <<<<<<<< test/a.txt
  This row is not the same.
  ========
  This row is different.
  >>>>>>>> test/b.txt

  This is also the same.
  And this too.

  <<<<<<<< test/a.txt
  This row is missing.
  ========
  >>>>>>>> test/b.txt

  More data.

  <<<<<<<< test/a.txt
  ========
  This row is added.
  >>>>>>>> test/b.txt

  And much more data.

  <<<<<<<< test/a.txt
  More differences.
  ========
  Another different block.
  This also added more rows.
  >>>>>>>> test/b.txt

  And much more data again.