mirror of
https://github.com/NixOS/nix
synced 2025-06-27 00:11:17 +02:00
756758d968
Looks like some cruft has been left over from previous refactorings. This removes dead variables, which should not have side effects in their constructors. In cases where the variable initialization has a purpose [[maybe_unused]] is inserted to silence compiler warnings.
136 lines
3.7 KiB
C++
136 lines
3.7 KiB
C++
#include "terminal.hh"
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#include "environment-variables.hh"
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#include "sync.hh"
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#if _WIN32
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# include <io.h>
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# define WIN32_LEAN_AND_MEAN
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# include <windows.h>
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# define isatty _isatty
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#else
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# include <sys/ioctl.h>
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#endif
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#include <unistd.h>
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namespace nix {
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bool isTTY()
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{
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static const bool tty =
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isatty(STDERR_FILENO)
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&& getEnv("TERM").value_or("dumb") != "dumb"
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&& !(getEnv("NO_COLOR").has_value() || getEnv("NOCOLOR").has_value());
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return tty;
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}
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std::string filterANSIEscapes(std::string_view s, bool filterAll, unsigned int width)
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{
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std::string t;
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size_t w = 0;
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auto i = s.begin();
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while (w < (size_t) width && i != s.end()) {
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if (*i == '\e') {
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std::string e;
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e += *i++;
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char last = 0;
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if (i != s.end() && *i == '[') {
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e += *i++;
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// eat parameter bytes
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while (i != s.end() && *i >= 0x30 && *i <= 0x3f) e += *i++;
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// eat intermediate bytes
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while (i != s.end() && *i >= 0x20 && *i <= 0x2f) e += *i++;
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// eat final byte
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if (i != s.end() && *i >= 0x40 && *i <= 0x7e) e += last = *i++;
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} else if (i != s.end() && *i == ']') {
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// OSC
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e += *i++;
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// eat ESC
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while (i != s.end() && *i != '\e') e += *i++;
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// eat backslash
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if (i != s.end() && *i == '\\') e += last = *i++;
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} else {
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if (i != s.end() && *i >= 0x40 && *i <= 0x5f) e += *i++;
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}
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if (!filterAll && last == 'm')
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t += e;
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}
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else if (*i == '\t') {
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i++; t += ' '; w++;
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while (w < (size_t) width && w % 8) {
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t += ' '; w++;
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}
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}
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else if (*i == '\r' || *i == '\a')
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// do nothing for now
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i++;
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else {
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w++;
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// Copy one UTF-8 character.
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if ((*i & 0xe0) == 0xc0) {
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t += *i++;
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if (i != s.end() && ((*i & 0xc0) == 0x80)) t += *i++;
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} else if ((*i & 0xf0) == 0xe0) {
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t += *i++;
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if (i != s.end() && ((*i & 0xc0) == 0x80)) {
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t += *i++;
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if (i != s.end() && ((*i & 0xc0) == 0x80)) t += *i++;
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}
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} else if ((*i & 0xf8) == 0xf0) {
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t += *i++;
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if (i != s.end() && ((*i & 0xc0) == 0x80)) {
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t += *i++;
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if (i != s.end() && ((*i & 0xc0) == 0x80)) {
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t += *i++;
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if (i != s.end() && ((*i & 0xc0) == 0x80)) t += *i++;
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}
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}
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} else
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t += *i++;
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}
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}
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return t;
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}
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//////////////////////////////////////////////////////////////////////
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static Sync<std::pair<unsigned short, unsigned short>> windowSize{{0, 0}};
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void updateWindowSize()
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{
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#ifndef _WIN32
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struct winsize ws;
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if (ioctl(2, TIOCGWINSZ, &ws) == 0) {
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auto windowSize_(windowSize.lock());
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windowSize_->first = ws.ws_row;
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windowSize_->second = ws.ws_col;
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}
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#else
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CONSOLE_SCREEN_BUFFER_INFO info;
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// From https://stackoverflow.com/a/12642749
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if (GetConsoleScreenBufferInfo(GetStdHandle(STD_OUTPUT_HANDLE), &info) != 0) {
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auto windowSize_(windowSize.lock());
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// From https://github.com/libuv/libuv/blob/v1.48.0/src/win/tty.c#L1130
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windowSize_->first = info.srWindow.Bottom - info.srWindow.Top + 1;
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windowSize_->second = info.dwSize.X;
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}
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#endif
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}
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std::pair<unsigned short, unsigned short> getWindowSize()
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{
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return *windowSize.lock();
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}
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}
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