455 lines
14 KiB
C++
455 lines
14 KiB
C++
#include "window.hh"
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#include "buffer.hh"
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#include "file.hh"
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#include "regex_selector.hh"
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#include "command_manager.hh"
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#include "buffer_manager.hh"
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#include "selectors.hh"
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#include "assert.hh"
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#include <unordered_map>
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#include <ncurses.h>
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using namespace Kakoune;
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void draw_window(Window& window)
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{
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int max_x,max_y;
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getmaxyx(stdscr, max_y, max_x);
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max_y -= 1;
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window.set_dimensions(WindowCoord(max_y, max_x));
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window.update_display_buffer();
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WindowCoord position;
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for (const DisplayAtom& atom : window.display_buffer())
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{
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const std::string& content = atom.content;
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if (atom.attribute & UNDERLINE)
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attron(A_UNDERLINE);
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else
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attroff(A_UNDERLINE);
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size_t pos = 0;
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size_t end;
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while (true)
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{
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move(position.line, position.column);
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clrtoeol();
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end = content.find_first_of('\n', pos);
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std::string line = content.substr(pos, end - pos);
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addstr(line.c_str());
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if (end != std::string::npos)
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{
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position.line = position.line + 1;
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position.column = 0;
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pos = end + 1;
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if (position.line >= max_y)
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break;
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}
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else
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{
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position.column += line.length();
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break;
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}
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}
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if (position.line >= max_y)
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break;
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}
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while (++position.line < max_y)
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{
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move(position.line, 0);
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clrtoeol();
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addch('~');
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}
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const WindowCoord& cursor_position = window.cursor_position();
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move(cursor_position.line, cursor_position.column);
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}
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void init_ncurses()
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{
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initscr();
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cbreak();
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noecho();
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nonl();
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intrflush(stdscr, false);
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keypad(stdscr, true);
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curs_set(2);
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}
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void deinit_ncurses()
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{
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endwin();
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}
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struct prompt_aborted {};
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struct NullCompletion
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{
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Completions operator() (const std::string&, size_t cursor_pos)
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{
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return Completions(cursor_pos, cursor_pos);
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}
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};
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std::string prompt(const std::string& text,
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std::function<Completions (const std::string&, size_t)> completer = NullCompletion())
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{
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int max_x, max_y;
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getmaxyx(stdscr, max_y, max_x);
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move(max_y-1, 0);
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addstr(text.c_str());
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clrtoeol();
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std::string result;
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size_t cursor_pos = 0;
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Completions completions;
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int current_completion = -1;
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std::string text_before_completion;
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while(true)
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{
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char c = getch();
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switch (c)
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{
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case '\r':
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return result;
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case 4:
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if (cursor_pos > 0)
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--cursor_pos;
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break;
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case 5:
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if (cursor_pos < result.length())
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++cursor_pos;
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break;
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case 7:
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if (cursor_pos != 0)
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{
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result = result.substr(0, cursor_pos - 1)
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+ result.substr(cursor_pos, std::string::npos);
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--cursor_pos;
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}
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current_completion = -1;
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break;
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case 27:
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throw prompt_aborted();
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case '\t':
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{
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if (current_completion == -1)
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{
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completions = completer(result, cursor_pos);
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if (completions.candidates.empty())
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break;
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text_before_completion = result.substr(completions.start,
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completions.end - completions.start);
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}
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++current_completion;
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std::string completion;
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if (current_completion >= completions.candidates.size())
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{
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if (current_completion == completions.candidates.size() and
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std::find(completions.candidates.begin(), completions.candidates.end(), text_before_completion) == completions.candidates.end())
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completion = text_before_completion;
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else
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{
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current_completion = 0;
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completion = completions.candidates[0];
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}
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}
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else
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completion = completions.candidates[current_completion];
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move(max_y-1, text.length());
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result = result.substr(0, completions.start) + completion;
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cursor_pos = completions.start + completion.length();
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break;
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}
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default:
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current_completion = -1;
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result = result.substr(0, cursor_pos) + c + result.substr(cursor_pos, std::string::npos);
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++cursor_pos;
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}
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move(max_y - 1, text.length());
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clrtoeol();
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addstr(result.c_str());
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move(max_y - 1, text.length() + cursor_pos);
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refresh();
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}
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return result;
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}
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void print_status(const std::string& status)
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{
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int x,y;
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getmaxyx(stdscr, y, x);
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move(y-1, 0);
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clrtoeol();
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addstr(status.c_str());
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}
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struct scoped_status
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{
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scoped_status(const std::string& status)
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{
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print_status(status);
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refresh();
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}
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~scoped_status()
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{
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print_status("");
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refresh();
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}
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};
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void do_insert(Window& window, bool append = false)
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{
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scoped_status("-- INSERT --");
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Kakoune::IncrementalInserter inserter(window, append);
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draw_window(window);
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while(true)
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{
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const WindowCoord& pos = inserter.cursors().back();
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move(pos.line, pos.column);
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char c = getch();
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switch (c)
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{
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case 27:
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return;
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case 4:
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inserter.move_cursor({0, -1});
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break;
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case 5:
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inserter.move_cursor({0, 1});
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break;
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case 7:
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inserter.erase();
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break;
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case '\r':
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c = '\n';
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default:
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inserter.insert(std::string() + c);
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}
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draw_window(window);
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}
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}
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void do_go(Window& window, int count)
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{
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BufferCoord target;
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if (count != 0)
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{
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target.line = count;
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}
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else
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{
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char c = getch();
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switch (c)
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{
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case 'g':
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case 't':
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target.line = 0;
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break;
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case 'b':
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target.line = window.buffer().line_count() - 1;
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break;
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}
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}
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BufferIterator target_it = window.buffer().iterator_at(target);
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window.move_cursor_to(window.line_and_column_at(target_it));
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}
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Window* current_window;
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void edit(const CommandParameters& params)
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{
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if (params.size() != 1)
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throw wrong_argument_count();
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std::string filename = params[0];
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Buffer* buffer = NULL;
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try
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{
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buffer = create_buffer_from_file(filename);
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}
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catch (file_not_found& what)
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{
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print_status("new file " + filename);
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buffer = new Buffer(filename);
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}
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current_window = buffer->get_or_create_window();
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}
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void write_buffer(const CommandParameters& params)
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{
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if (params.size() > 1)
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throw wrong_argument_count();
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Buffer& buffer = current_window->buffer();
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std::string filename = params.empty() ? buffer.name() : params[0];
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write_buffer_to_file(buffer, filename);
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}
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bool quit_requested = false;
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void quit(const CommandParameters& params)
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{
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if (params.size() != 0)
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throw wrong_argument_count();
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quit_requested = true;
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}
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void show_buffer(const CommandParameters& params)
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{
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if (params.size() != 1)
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throw wrong_argument_count();
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Buffer* buffer = BufferManager::instance().get_buffer(params[0]);
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if (not buffer)
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print_status("buffer " + params[0] + " does not exists");
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else
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current_window = buffer->get_or_create_window();
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}
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CommandManager command_manager;
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void do_command()
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{
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try
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{
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command_manager.execute(prompt(":", std::bind(&CommandManager::complete,
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&command_manager,
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std::placeholders::_1,
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std::placeholders::_2)));
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}
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catch (prompt_aborted&) {}
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}
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void do_search(Window& window)
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{
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try
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{
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std::string ex = prompt("/");
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window.select(false, RegexSelector(ex));
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}
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catch (prompt_aborted&) {}
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}
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std::unordered_map<char, std::function<void (Window& window, int count)>> keymap =
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{
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{ 'h', [](Window& window, int count) { window.move_cursor(WindowCoord(0, -std::max(count,1))); window.empty_selections(); } },
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{ 'j', [](Window& window, int count) { window.move_cursor(WindowCoord( std::max(count,1), 0)); window.empty_selections(); } },
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{ 'k', [](Window& window, int count) { window.move_cursor(WindowCoord(-std::max(count,1), 0)); window.empty_selections(); } },
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{ 'l', [](Window& window, int count) { window.move_cursor(WindowCoord(0, std::max(count,1))); window.empty_selections(); } },
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{ 'H', [](Window& window, int count) { window.select(true, std::bind(move_select, std::ref(window), std::placeholders::_1,
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WindowCoord(0, -std::max(count,1)))); } },
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{ 'J', [](Window& window, int count) { window.select(true, std::bind(move_select, std::ref(window), std::placeholders::_1,
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WindowCoord( std::max(count,1), 0))); } },
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{ 'K', [](Window& window, int count) { window.select(true, std::bind(move_select, std::ref(window), std::placeholders::_1,
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WindowCoord(-std::max(count,1), 0))); } },
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{ 'L', [](Window& window, int count) { window.select(true, std::bind(move_select, std::ref(window), std::placeholders::_1,
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WindowCoord(0, std::max(count,1)))); } },
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{ 't', [](Window& window, int count) { window.select(false, std::bind(select_to, std::placeholders::_1, getch(), false)); } },
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{ 'f', [](Window& window, int count) { window.select(false, std::bind(select_to, std::placeholders::_1, getch(), true)); } },
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{ 'd', [](Window& window, int count) { window.erase(); window.empty_selections(); } },
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{ 'c', [](Window& window, int count) { window.erase(); do_insert(window); } },
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{ 'i', [](Window& window, int count) { do_insert(window); } },
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{ 'a', [](Window& window, int count) { do_insert(window, true); } },
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{ 'o', [](Window& window, int count) { window.select(true, select_line); window.append("\n"); do_insert(window, true); } },
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{ 'g', do_go },
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{ ':', [](Window& window, int count) { do_command(); } },
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{ ' ', [](Window& window, int count) { window.empty_selections(); } },
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{ 'w', [](Window& window, int count) { do { window.select(false, select_to_next_word); } while(--count > 0); } },
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{ 'W', [](Window& window, int count) { do { window.select(true, select_to_next_word); } while(--count > 0); } },
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{ 'e', [](Window& window, int count) { do { window.select(false, select_to_next_word_end); } while(--count > 0); } },
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{ 'E', [](Window& window, int count) { do { window.select(true, select_to_next_word_end); } while(--count > 0); } },
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{ 'b', [](Window& window, int count) { do { window.select(false, select_to_previous_word); } while(--count > 0); } },
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{ 'B', [](Window& window, int count) { do { window.select(true, select_to_previous_word); } while(--count > 0); } },
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{ '.', [](Window& window, int count) { do { window.select(false, select_line); } while(--count > 0); } },
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{ 'm', [](Window& window, int count) { window.select(false, select_matching); } },
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{ 'M', [](Window& window, int count) { window.select(true, select_matching); } },
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{ '/', [](Window& window, int count) { do_search(window); } },
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{ 'u', [](Window& window, int count) { do { if (not window.undo()) { print_status("nothing left to undo"); break; } } while(--count > 0); } },
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{ 'U', [](Window& window, int count) { do { if (not window.redo()) { print_status("nothing left to redo"); break; } } while(--count > 0); } },
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};
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int main(int argc, char* argv[])
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{
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init_ncurses();
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command_manager.register_command(std::vector<std::string>{ "e", "edit" }, edit,
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PerArgumentCommandCompleter{ complete_filename });
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command_manager.register_command(std::vector<std::string>{ "q", "quit" }, quit);
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command_manager.register_command(std::vector<std::string>{ "w", "write" }, write_buffer,
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PerArgumentCommandCompleter{ complete_filename });
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command_manager.register_command(std::vector<std::string>{ "b", "buffer" }, show_buffer,
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PerArgumentCommandCompleter { complete_buffername });
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try
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{
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auto buffer = (argc > 1) ? create_buffer_from_file(argv[1]) : new Buffer("<scratch>");
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current_window = buffer->get_or_create_window();
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draw_window(*current_window);
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int count = 0;
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while(not quit_requested)
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{
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try
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{
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char c = getch();
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if (isdigit(c))
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count = count * 10 + c - '0';
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else
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{
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if (keymap.find(c) != keymap.end())
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{
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keymap[c](*current_window, count);
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draw_window(*current_window);
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}
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count = 0;
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}
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}
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catch (Kakoune::runtime_error& error)
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{
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print_status(error.description());
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}
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}
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deinit_ncurses();
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}
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catch (Kakoune::exception& error)
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{
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deinit_ncurses();
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puts("uncaught exception:\n");
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puts(error.description().c_str());
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return -1;
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}
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catch (...)
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{
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deinit_ncurses();
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throw;
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}
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return 0;
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}
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