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// Copyright 2013 Google Inc. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "line_printer.h"
#include <stdio.h>
#include <stdlib.h>
#ifdef _WIN32
#include <windows.h>
#else
#include <unistd.h>
#include <sys/ioctl.h>
#include <termios.h>
#include <sys/time.h>
#endif
// Make sure printf is really adb_printf which works for UTF-8 on Windows.
#include <sysdeps.h>
// Stuff from ninja's util.h that's needed below.
#include <vector>
using namespace std;
// This does not account for multiple UTF-8 bytes corresponding to a single Unicode code point, or
// multiple code points corresponding to a single grapheme cluster (user-perceived character).
string ElideMiddle(const string& str, size_t width) {
const int kMargin = 3; // Space for "...".
string result = str;
if (result.size() + kMargin > width) {
size_t elide_size = (width - kMargin) / 2;
result = result.substr(0, elide_size)
+ "..."
+ result.substr(result.size() - elide_size, elide_size);
}
return result;
}
LinePrinter::LinePrinter() : have_blank_line_(true) {
#ifndef _WIN32
const char* term = getenv("TERM");
smart_terminal_ = unix_isatty(1) && term && string(term) != "dumb";
#else
// Disable output buffer. It'd be nice to use line buffering but
// MSDN says: "For some systems, [_IOLBF] provides line
// buffering. However, for Win32, the behavior is the same as _IOFBF
// - Full Buffering."
setvbuf(stdout, nullptr, _IONBF, 0);
console_ = GetStdHandle(STD_OUTPUT_HANDLE);
CONSOLE_SCREEN_BUFFER_INFO csbi;
smart_terminal_ = GetConsoleScreenBufferInfo(console_, &csbi);
#endif
}
static void Out(const std::string& s) {
// Avoid printf and C strings, since the actual output might contain null
// bytes like UTF-16 does (yuck).
fwrite(s.data(), 1, s.size(), stdout);
}
void LinePrinter::Print(string to_print, LineType type) {
if (!smart_terminal_) {
if (type == LineType::INFO) {
info_line_ = to_print + "\n";
} else {
Out(to_print + "\n");
}
return;
}
// Print over previous line, if any.
// On Windows, calling a C library function writing to stdout also handles
// pausing the executable when the "Pause" key or Ctrl-S is pressed.
printf("\r");
if (type == INFO) {
#ifdef _WIN32
CONSOLE_SCREEN_BUFFER_INFO csbi;
GetConsoleScreenBufferInfo(console_, &csbi);
to_print = ElideMiddle(to_print, static_cast<size_t>(csbi.dwSize.X));
std::wstring to_print_wide;
// ElideMiddle may create invalid UTF-8, so ignore conversion errors.
(void)android::base::UTF8ToWide(to_print, &to_print_wide);
// We don't want to have the cursor spamming back and forth, so instead of
// printf use WriteConsoleOutput which updates the contents of the buffer,
// but doesn't move the cursor position.
COORD buf_size = { csbi.dwSize.X, 1 };
COORD zero_zero = { 0, 0 };
SMALL_RECT target = {
csbi.dwCursorPosition.X, csbi.dwCursorPosition.Y,
static_cast<SHORT>(csbi.dwCursorPosition.X + csbi.dwSize.X - 1),
csbi.dwCursorPosition.Y
};
vector<CHAR_INFO> char_data(csbi.dwSize.X);
for (size_t i = 0; i < static_cast<size_t>(csbi.dwSize.X); ++i) {
char_data[i].Char.UnicodeChar = i < to_print_wide.size() ? to_print_wide[i] : L' ';
char_data[i].Attributes = csbi.wAttributes;
}
WriteConsoleOutputW(console_, &char_data[0], buf_size, zero_zero, &target);
#else
// Limit output to width of the terminal if provided so we don't cause
// line-wrapping.
winsize size;
if ((ioctl(0, TIOCGWINSZ, &size) == 0) && size.ws_col) {
to_print = ElideMiddle(to_print, size.ws_col);
}
Out(to_print);
printf("\x1B[K"); // Clear to end of line.
fflush(stdout);
#endif
have_blank_line_ = false;
} else {
Out(to_print);
Out("\n");
have_blank_line_ = true;
}
}
void LinePrinter::KeepInfoLine() {
if (smart_terminal_) {
if (!have_blank_line_) Out("\n");
have_blank_line_ = true;
} else {
Out(info_line_);
info_line_.clear();
}
}
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