bitfield / script Public

Co-authored-by: Aaron Huntley <aaron.huntley2007@gmail.com>
Co-authored-by: Brian Hasden <bhasden@gmail.com>
Co-authored-by: Umang Vanjara <umang.vanjara@gmail.com>

refactor docs, add examples

Bug fixes and improvements for corner cases

Previously, pipes always wrote to os.Stdout on calling Stdout().
This made it awkward to test. Now you can set a 'fake stdout'
by calling WithStdout(io.Writer) on the pipe.

Fix the defect that Column crashes on zero or negative input.
Fix the defect that Last() crashes on negative input;
Fix the defect that Regex filters crashes on nil regex expression;
Add unit test for WithError(); close the pipe when a non-nil error is set;
Add ExecForEach, Reject(), and RejectRegexp to doMethodsOnPipe tests;
Improve coverage by adding equal counts in the testcase of Freq;
Use io.Copy() in Stdout() to improve efficiency.

Previously, pipes always wrote to os.Stdout on calling Stdout().
This made it awkward to test. Now you can set a 'fake stdout'
by calling WithStdout(io.Writer) on the pipe.

Fix #81

WriteFile is supposed to truncate and overwrite an existing file. In fact, it was overwriting the beginning of the file with the new data, but leaving the remaining old data intact. Adding the O_TRUNC flag to os.OpenFile fixes this.

* Add Slice() sink (fixes #47)

* Add test with empty pipe

* Apply suggestions from code review

Co-Authored-By: John Arundel <john@bitfieldconsulting.com>

* Not using type as variable name

* Using cmp to deep compare

* Not testing ListFiles in the test method for SliceSink

* Remove examples/visitors/go.sum who should not be commited

* An empty pipe should return an empty Slice

* Better example for Slice

* Ignore all go.sum

Co-authored-by: John Arundel <john@bitfieldconsulting.com>

* use cmp.diff when printing error

* Remove comma in doc

* Move Slice after SHA256

* Edit comments

* Adding trailing blank line:

* Single line with embeded new lines

* Code style

* Range over pids

* Code style

* Using EachLine to split on each lines

* Slice is supposed to be after SHA256

* Change order of params in cmp.Equal

* Better explanation in test

* typo

* Better example who don't use system specific command

* still an order problem

* Order problem

* Add comment to the example for slice

* Move the test to a t.Run format

* Change order for cmp.Equal

* Add example file

* Tweaks to SliceSink

Co-authored-by: John Arundel <john@bitfieldconsulting.com>
Co-authored-by: Thomas Poignant <thomas.poignant@adevinta.com>

Add ExecForEach()

Have Concat skip errors (fixes #26)

Fix Exec to handle quotes