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#pragma once
///@file
#include <limits>
#include <string>
namespace nix {
/**
* Determine whether ANSI escape sequences are appropriate for the
* present output.
*
* This follows the rules described on https://bixense.com/clicolors/
* with CLICOLOR defaulted to enabled (and thus ignored).
*
* That is to say, the following procedure is followed in order:
* - NO_COLOR or NOCOLOR set -> always disable colour
* - CLICOLOR_FORCE or FORCE_COLOR set -> enable colour
* - The output is a tty; TERM != "dumb" -> enable colour
* - Otherwise -> disable colour
*/
bool shouldANSI();
/**
* Truncate a string to 'width' printable characters. If 'filterAll'
* is true, all ANSI escape sequences are filtered out. Otherwise,
* some escape sequences (such as colour setting) are copied but not
* included in the character count. Also, tabs are expanded to
* spaces.
*/
std::string filterANSIEscapes(std::string_view s,
bool filterAll = false,
unsigned int width = std::numeric_limits<unsigned int>::max(),
bool eatTabs = true);
/**
* Recalculate the window size, updating a global variable. Used in the
* `SIGWINCH` signal handler.
*/
void updateWindowSize();
/**
* @return the number of rows and columns of the terminal.
*
* The value is cached so this is quick. The cached result is computed
* by `updateWindowSize()`.
*/
std::pair<unsigned short, unsigned short> getWindowSize();
}
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