R packages - Apr 2018 - New Package fansi: ANSI Control Sequence Aware String Functions

fansi provides counterparts to the base string manipulation functions substr,
strwrap, strtrim, strsplit, and n(z)char that account for ANSI CSI SGR control
sequences.? ANSI CSI SGR control sequences [1] can be used to format text in
terminals that support them.

For example the control sequence "\033[31m" causes text that follows
to render in red, and the control sequence "\033[0m" turns off
formatting.? So with:
> substr_ctl("\033[31mABC\033[0m", 2, 2)
[1] "\033[31mB\033[0m"

we extract the second letter of the red formatted ABC while retaining the
formatting.

fansi is written mostly in C, so its performance is comparable to the
corresponding base functions.? There are versions of some of the functions with
additional functionality.? For example, `substr2_ctl` supports character-width
(as opposed to character-count) based substrings.

fansi is dependency-less.

Feedback is welcome either by e-mail or via github
(<https://github.com/brodieG/fansi>).


Brodie.

[1]
<https://en.wikipedia.org/wiki/ANSI_escape_code#SGR_(Select_Graphic_Rendition)_parameters>.

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