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