432 lines
8.8 KiB
C++
432 lines
8.8 KiB
C++
#include <stdio.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <string.h>
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#include <errno.h>
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#include <error.h>
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#include <libmaxsi/platform.h>
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#include <libmaxsi/sortix-keyboard.h>
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const int MODE_QUIT = 0;
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const int MODE_TEXT = 1;
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const int MODE_CONFIRM_QUIT = 2;
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const int MODE_SAVE = 3;
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const int MODE_LOAD = 4;
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const unsigned WIDTH = 80;
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const unsigned HEIGHT = 24;
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char buffers[HEIGHT+1][WIDTH+1];
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unsigned cursorx = 0;
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unsigned cursory = 0;
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unsigned numlines = 1;
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char filename[256];
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bool bufferchanged;
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void clearbuffers()
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{
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for ( unsigned y = 0; y < HEIGHT + 1; y++ )
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{
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for ( unsigned x = 0; x < WIDTH + 1; x++ ) { buffers[y][x] = 0; }
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}
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bufferchanged = true;
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}
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using namespace Maxsi;
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void cursorto(unsigned x, unsigned y)
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{
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printf("\e[%u;%uH", y+1+1, x+1);
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}
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void drawtextmode()
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{
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const char* printfilename = ( strlen(filename) > 0 ) ? filename : "New Buffer";
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printf("\e[30m\e[47m\e[2J\e[H");
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printf("Text Editor\t\tfile: %s\n", printfilename);
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printf("\e[37m\e[40m\e[0J");
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for ( unsigned y = 0; y < HEIGHT; y++ )
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{
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printf("%s", buffers[y]);
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if ( y < HEIGHT-1 ) { printf("\n"); }
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}
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cursorto(cursorx, cursory);
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}
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unsigned textmode()
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{
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drawtextmode();
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bool ctrl = false;
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int oldcursorx = -1;
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int oldcursory = -1;
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while ( true )
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{
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if ( oldcursorx != cursorx || oldcursory != cursory )
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{
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cursorto(cursorx, cursory);
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oldcursorx = cursorx;
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oldcursory = cursory;
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}
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unsigned method = System::Keyboard::POLL;
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uint32_t codepoint = System::Keyboard::ReceiveKeystroke(method);
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if ( codepoint == 0 ) { continue; }
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if ( codepoint & Keyboard::DEPRESSED )
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{
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if ( codepoint == Keyboard::CTRL | Keyboard::DEPRESSED ) { ctrl = false; }
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continue;
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}
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if ( ctrl )
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{
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if ( codepoint == 'o' || codepoint == 'O' ) { return MODE_SAVE; }
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if ( codepoint == 'r' || codepoint == 'R' ) { return MODE_LOAD; }
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if ( codepoint == 'x' || codepoint == 'X' ) { return MODE_CONFIRM_QUIT; }
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continue;
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}
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switch ( codepoint )
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{
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case Keyboard::ESC:
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return MODE_CONFIRM_QUIT;
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break;
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case Keyboard::CTRL:
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ctrl = true;
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break;
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case Keyboard::UP:
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if ( cursory ) { cursory--; }
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break;
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case '\n':
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cursorx = 0;
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if ( cursory < HEIGHT-1 ) { numlines++; }
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case Keyboard::DOWN:
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if ( cursory < numlines-1 ) { cursory++; }
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break;
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case Keyboard::LEFT:
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if ( cursorx ) { cursorx--; }
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break;
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case Keyboard::RIGHT:
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if ( cursorx < WIDTH-1 ) { cursorx++; }
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break;
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case '\b':
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if ( cursorx )
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{
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cursorx--;
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for ( unsigned x = cursorx; x < WIDTH; x++ )
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{
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buffers[cursory][x] = buffers[cursory][x+1];
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bufferchanged = true;
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}
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printf("\e[2K\r%s", buffers[cursory]);
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}
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else if ( 0 < cursory && strlen(buffers[cursory]) == 0 )
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{
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for ( unsigned y = cursory; y < numlines; y++ )
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{
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for ( unsigned x = 0; x < WIDTH; x++ )
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{
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buffers[y][x] = buffers[y+1][x];
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}
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}
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numlines--;
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cursory--;
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cursorx = strlen(buffers[cursory]);
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drawtextmode();
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}
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break;
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}
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size_t linelen = strlen(buffers[cursory]);
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if ( linelen < cursorx ) { cursorx = linelen; }
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if ( WIDTH <= cursorx ) { continue; }
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if ( codepoint >= 0x80 ) { continue; }
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if ( codepoint == '\t' ) { continue; }
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if ( codepoint == '\b' ) { continue; }
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if ( codepoint == '\n' ) { continue; }
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if ( codepoint == '\r' ) { continue; }
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char msg[2];
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msg[0] = codepoint;
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msg[1] = 0;
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printf("%s", msg);
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buffers[cursory][cursorx++] = codepoint;
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bufferchanged = true;
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if ( WIDTH <= cursorx ) { cursorx = WIDTH-1; }
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}
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return MODE_QUIT;
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}
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unsigned confirmquit()
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{
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if ( !bufferchanged ) { return MODE_QUIT; }
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printf("\e37m\e40m\e[2J\e[H");
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printf("There are unsaved changes: Are you sure you want to quit? (Y/N)\n");
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while ( true )
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{
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unsigned method = System::Keyboard::POLL;
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uint32_t codepoint = System::Keyboard::ReceiveKeystroke(method);
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if ( codepoint == 0 ) { continue; }
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if ( codepoint & Keyboard::DEPRESSED ) { continue; }
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switch ( codepoint )
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{
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case Keyboard::ESC:
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return MODE_QUIT;
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break;
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case 'n':
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case 'N':
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return MODE_TEXT;
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case 'y':
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case 'Y':
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return MODE_QUIT;
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default:
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printf("Would you like to quit? N for No, Y for Yes\n");
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}
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}
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}
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bool savetofile(const char* path)
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{
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int fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, 0777);
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if ( fd < 0 ) { error(0, errno, "%s", path); return false; }
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for ( unsigned y = 0; y < numlines; y++ )
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{
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size_t len = strlen(buffers[y]);
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buffers[y][len] = '\n';
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bool result = !writeall(fd, buffers[y], len+1);
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buffers[y][len] = 0;
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if ( !result ) { error(0, errno, "write: %s", path); close(fd); return false; }
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}
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if ( close(fd) ) { error(0, errno, "close: %s", path); return false; }
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return true;
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}
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int savemode()
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{
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printf("\e37m\e40m\e[2J\e[H");
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printf("Please enter the filename you wish to save the text to and press "
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"enter. Type an empty filename or press ESC to abort.\n\n");
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char writefilename[256];
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strcpy(writefilename, filename);
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retry:
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size_t len = strlen(writefilename);
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printf("File Name to Write: %s", writefilename);
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bool readytosave = false;
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while ( !readytosave )
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{
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unsigned method = System::Keyboard::POLL;
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uint32_t codepoint = System::Keyboard::ReceiveKeystroke(method);
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if ( codepoint == 0 ) { continue; }
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if ( codepoint & Keyboard::DEPRESSED ) { continue; }
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switch ( codepoint )
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{
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case Keyboard::ESC:
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return MODE_TEXT;
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break;
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case '\b':
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if ( 0 < len ) { printf("\b"); writefilename[--len] = 0; }
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break;
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case '\n':
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if ( len == 0 ) { return MODE_TEXT; }
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readytosave = true;
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printf("\n");
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break;
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default:
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if ( 0x80 <= codepoint ) { continue; }
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writefilename[len++] = codepoint;
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writefilename[len+1] = 0;
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char msg[2];
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msg[0] = codepoint;
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msg[1] = 0;
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printf("%s", msg);
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}
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}
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if ( !savetofile(writefilename) ) { goto retry; }
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strcpy(filename, writefilename);
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bufferchanged = false;
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printf("Succesfully saved\n");
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sleep(1);
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return MODE_TEXT;
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}
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bool loadfromfile(const char* path)
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{
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int fd = open(path, O_RDONLY, 0777);
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if ( fd < 0 ) { error(0, errno, "%s", path); return false; }
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clearbuffers();
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const size_t BUFFER_SIZE = 256;
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char buffer[BUFFER_SIZE];
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bool done = false;
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while ( !done )
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{
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ssize_t bytesread = read(fd, buffer, BUFFER_SIZE);
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if ( bytesread < 0 ) { error(0, errno, "read: %s", path); close(fd); return false; }
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if ( bytesread == 0 ) { break; }
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for ( ssize_t i = 0; i < bytesread; i++ )
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{
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if ( buffer[i] == '\n' )
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{
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if ( HEIGHT-1 <= ++cursory ) { done = true; break; }
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cursorx = 0;
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continue;
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}
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if ( WIDTH <= cursorx ) { continue; }
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buffers[cursory][cursorx++] = buffer[i];
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}
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}
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numlines = cursory + 1;
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close(fd);
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cursorx = 0;
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cursory = 0;
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return true;
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}
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int loadmode()
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{
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printf("\e37m\e40m\e[2J\e[H");
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printf("Please enter the filename you wish to load text from and press "
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"enter. Type an empty filename or press ESC to abort.\n\n");
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char loadfilename[256];
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loadfilename[0] = 0;
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retry:
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size_t len = strlen(loadfilename);
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printf("File Name to Load: %s", loadfilename);
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bool readytoload = false;
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while ( !readytoload )
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{
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unsigned method = System::Keyboard::POLL;
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uint32_t codepoint = System::Keyboard::ReceiveKeystroke(method);
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if ( codepoint == 0 ) { continue; }
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if ( codepoint & Keyboard::DEPRESSED ) { continue; }
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switch ( codepoint )
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{
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case Keyboard::ESC:
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return MODE_TEXT;
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break;
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case '\b':
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if ( 0 < len ) { printf("\b"); loadfilename[--len] = 0; }
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break;
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case '\n':
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if ( len == 0 ) { return MODE_TEXT; }
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readytoload = true;
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printf("\n");
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break;
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default:
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if ( 0x80 <= codepoint ) { continue; }
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loadfilename[len++] = codepoint;
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loadfilename[len+1] = 0;
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char msg[2];
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msg[0] = codepoint;
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msg[1] = 0;
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printf("%s", msg);
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}
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}
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if ( !loadfromfile(loadfilename) )
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{
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clearbuffers();
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cursorx = 0;
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cursory = 0;
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goto retry;
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}
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strcpy(filename, loadfilename);
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bufferchanged = false;
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return MODE_TEXT;
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}
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void run()
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{
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bufferchanged = false;
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unsigned mode = MODE_TEXT;
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while ( mode != MODE_QUIT )
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{
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switch ( mode )
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{
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case MODE_TEXT:
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mode = textmode();
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break;
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case MODE_CONFIRM_QUIT:
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mode = confirmquit();
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break;
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case MODE_SAVE:
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mode = savemode();
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break;
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case MODE_LOAD:
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mode = loadmode();
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break;
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default:
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printf("Application Bug: Unknown Mode\n");
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sleep(1);
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mode = MODE_TEXT;
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break;
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}
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}
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printf("\e[37m\e[40m\e[2J\e[H");
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}
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int main(int argc, char* argv[])
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{
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if ( !isatty(1) ) { error(1, errno, "stdout must be a tty"); return 1; }
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if ( argc < 2 )
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{
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clearbuffers();
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strcpy(filename, "");
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}
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else
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{
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strcpy(filename, argv[1]);
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if ( !loadfromfile(filename) ) { clearbuffers(); }
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cursorx = 0;
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cursory = 0;
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}
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run();
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return 0;
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}
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