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Diffstat (limited to 'butl/pager.cxx')
| -rw-r--r-- | butl/pager.cxx | 207 |
1 files changed, 0 insertions, 207 deletions
diff --git a/butl/pager.cxx b/butl/pager.cxx deleted file mode 100644 index 003c65c..0000000 --- a/butl/pager.cxx +++ /dev/null @@ -1,207 +0,0 @@ -// file : butl/pager.cxx -*- C++ -*- -// copyright : Copyright (c) 2014-2017 Code Synthesis Ltd -// license : MIT; see accompanying LICENSE file - -#include <butl/pager> - -#ifndef _WIN32 -# include <unistd.h> // STDOUT_FILENO -# include <sys/ioctl.h> // ioctl() - -# include <chrono> -# include <thread> // this_thread::sleep_for() -#else -# include <butl/win32-utility> -#endif - -#include <cstring> // strchr() -#include <utility> // move() - -#include <butl/utility> // operator<<(ostream, exception), - // throw_generic_error() -#include <butl/fdstream> // fdclose() - -using namespace std; - -namespace butl -{ - pager:: - pager (const string& name, - bool verbose, - const string* pager, - const vector<string>* pager_options) - // Create successfully exited process. Will "wait" for it if fallback to - // non-interactive execution path. - // - : p_ (process_exit (0)) - { - // If we are using the default pager, try to get the terminal width - // so that we can center the output. - // - if (pager == nullptr) - { - size_t col (0); - -#ifndef _WIN32 -# ifdef TIOCGWINSZ - struct winsize w; - if (ioctl (STDOUT_FILENO, TIOCGWINSZ, &w) == 0) - col = static_cast<size_t> (w.ws_col); -# endif -#else - // This works properly on PowerShell, while for the regular console - // (cmd.exe) it always returns 80 columns. - // - CONSOLE_SCREEN_BUFFER_INFO w; - if (GetConsoleScreenBufferInfo (GetStdHandle (STD_OUTPUT_HANDLE), &w)) - col = static_cast<size_t> (w.srWindow.Right - w.srWindow.Left + 1); -#endif - if (col > 80) - indent_.assign ((col - 80) / 2, ' '); - } - - vector<const char*> args; - string prompt; - - if (pager != nullptr) - { - if (pager->empty ()) - return; // No pager should be used. - - args.push_back (pager->c_str ()); - } - else - { - // By default try less (again, no pun intended). - // - prompt = "-Ps" + name + " (press q to quit, h for help)"; - - args.push_back ("less"); - args.push_back ("-R"); // Handle ANSI color. - - args.push_back (prompt.c_str ()); - } - - // Add extra pager options. - // - if (pager_options != nullptr) - for (const string& o: *pager_options) - args.push_back (o.c_str ()); - - args.push_back (nullptr); - - if (verbose) - { - for (const char* const* p (args.data ()); *p != nullptr; ++p) - { - if (p != args.data ()) - cerr << ' '; - - // Quote if empty or contains spaces. - // - bool q (**p == '\0' || strchr (*p, ' ') != nullptr); - - if (q) - cerr << '"'; - - cerr << *p; - - if (q) - cerr << '"'; - } - cerr << endl; - } - - // Ignore errors and go without a pager unless the pager was specified - // by the user. - // - try - { - p_ = process (args.data (), -1); // Redirect child's STDIN to a pipe. - - // Wait a bit and see if the pager has exited before reading anything - // (e.g., because exec() couldn't find the program). If you know a - // cleaner way to handle this, let me know (and no, a select()-based - // approach doesn't work; the pipe is buffered and therefore is always - // ready for writing). - // - // MINGW GCC 4.9 doesn't implement this_thread so use Win32 Sleep(). - // -#ifndef _WIN32 - this_thread::sleep_for (chrono::milliseconds (50)); -#else - Sleep (50); -#endif - - bool r; - if (p_.try_wait (r)) - { - p_.out_fd.reset (); - - if (pager != nullptr) - throw_generic_error (ECHILD); - } - else - os_.open (move (p_.out_fd)); - } - catch (const process_error& e) - { - if (e.child) - { - cerr << args[0] << ": unable to execute: " << e << endl; - exit (1); - } - - // Ignore unless it was a user-specified pager. - // - if (pager != nullptr) - throw; // Re-throw as system_error. - } - - // Setup the indentation machinery. - // - if (!indent_.empty ()) - buf_ = stream ().rdbuf (this); - } - - bool pager:: - wait (bool ie) - { - // Teardown the indentation machinery. - // - if (buf_ != nullptr) - { - stream ().rdbuf (buf_); - buf_ = nullptr; - } - - // Prevent ofdstream::close() from throwing in the ignore errors mode. - // - if (ie) - os_.exceptions (ofdstream::goodbit); - - os_.close (); - return p_.wait (ie); - } - - pager::int_type pager:: - overflow (int_type c) - { - if (prev_ == '\n' && c != '\n') // Don't indent blanks. - { - auto n (static_cast<streamsize> (indent_.size ())); - - if (buf_->sputn (indent_.c_str (), n) != n) - return traits_type::eof (); - } - - prev_ = c; - return buf_->sputc (c); - } - - int pager:: - sync () - { - return buf_->pubsync (); - } -} |