• New feature: --extra key "python format string", for adding additional output keys to the human-readable version of the diff. #38
• Don't crash in JSON format mode if some JSON keys are missing. #13
• Now includes a Dockerfile and instructions for building and running it that way. Thanks, @gourk. #11

• Tool now also works against inputs that are JSON files consisting of a list of objects with identical keys, using --format=json. #12

• New --show-unchanged option for outputting the unchanged values of rows that had at least one change. #9
• Fix for bug with column names that contained a . character. #7
• Fix for error when no --key provided - thanks, @MainHanzo. #3
• CSV delimiter sniffer now ; delimited files. #6

• Support for TSV files. The tool will automatically detect if the input is CSV or TSV, or you can use the new --format=tsv or --format=csv options to over-ride the automatic detection. Thanks, Thomas Sibley for contributing this new feature. (#4)

Tweaked output formatting of added/removed columns for better consistency with added/removed/changed rows.

Handle columns being added and removed

My sf-tree-history project unexpectedly broke because the columns in the CSV file changed.

https://circleci.com/gh/simonw/sf-tree-history/110

csv-diff can now detect and handle this without crashing.

Example commit: simonw/sf-tree-history@781d7c4

--singular and --plural options, closes #2

Added and deleted rows now display in a more human-friendly format than raw JSON:

$ csv-diff one.csv two.csv --key=id
1 row changed, 1 row added, 1 row removed
1 row changed
  Row 1
    age: "4" => "5"
1 row added
  id: 3
  name: Bailey
  age: 1
1 row removed
  id: 2
  name: Pancakes
  age: 2

Example commit here: simonw/sf-tree-history@184efa - compare with simonw/sf-tree-history@dd08cc which demonstrates the previous behaviour.

Changed the order of the human text output: it's now changed, added, removed

I did this so that this commit message would be more interesting to read once GitHub truncated it.