add -c and --clip option to tail

[caillouc]

Add the possibility to copy the first line of the file and display only the tail of the file.
tail would support -c and --clip option

[ahippo]

Oh, shellcheck also complains quite a bit:
(which can be fixed by basically wrapping up the whole thing into a function like cmd_tail()

$ make lint
shellcheck -s bash src/tail.bash

In src/tail.bash line 3:
local opts clip=0
^---^ SC2168: 'local' is only valid in functions.


In src/tail.bash line 5:
local err=$?
^---^ SC2168: 'local' is only valid in functions.


In src/tail.bash line 14:
local pass
^---^ SC2168: 'local' is only valid in functions.


In src/tail.bash line 15:
local path="$1"
^---^ SC2168: 'local' is only valid in functions.


In src/tail.bash line 16:
local passfile="$PREFIX/$path.gpg"
^---^ SC2168: 'local' is only valid in functions.


In src/tail.bash line 23:
                local cpy="$(echo "$pass" | $BASE64 -d | head -n 1)"
                ^---^ SC2168: 'local' is only valid in functions.
                      ^-^ SC2155: Declare and assign separately to avoid masking return values.

For more information:
  https://www.shellcheck.net/wiki/SC2168 -- 'local' is only valid in functions.
  https://www.shellcheck.net/wiki/SC2155 -- Declare and assign separately to ...
make: *** [Makefile:37: lint] Error 1

[palortoff]

This looks great. Thanks

Could you please make a note in the readme to explain the -c option?

Also please add this to the completion.

COMPREPLY+=($(compgen -W "-c --clip" -- ${cur}))

Finally please rebase on master and squash the commit so that the PR only consists of one commit.

Also thanks to @ahippo for the review!

[ahippo]

Also thanks to @ahippo for the review!

Sure, you're welcome!

[ahippo]

Looks good to me!

[caillouc]

Don't hesitate to tell me if you need me to add anything

[johnrichardrinehart]

@palortoff Good to merge?

[ahippo]

@palortoff , any help needed in merging the PR?

[caillouc]

@palortoff I think the pull request is ready for a merge now