Permalink
Branch: master
Find file Copy path
Fetching contributors…
Cannot retrieve contributors at this time
1366 lines (1203 sloc) 24 KB
/*** includes ***/
#define _DEFAULT_SOURCE
#define _BSD_SOURCE
#define _GNU_SOURCE
#include <unistd.h>
#include <termios.h>
#include <stdlib.h>
#include <stdarg.h>
#include <ctype.h>
#include <stdio.h>
#include <errno.h>
#include <sys/ioctl.h>
#include <string.h>
#include <sys/types.h>
#include <time.h>
#include <fcntl.h>
/*** defines ***/
#define KILO_VERSION "0.0.1"
#define KILO_TAB_STOP 8
#define KILO_QUIT_TIMES 3
#define CTRL_KEY(k) ((k)&0x1f)
//bitwise-ANDs 00011111
enum editorKey
{
BACKSPACE = 127,
ARROW_LEFT = 1000,
ARROW_RIGHT,
ARROW_UP,
ARROW_DOWN,
DEL_KEY,
HOME_KEY,
END_KEY,
PAGE_UP,
PAGE_DOWN
};
enum editorHighlight
{
HL_NORMAL = 0,
HL_COMMENT,
HL_MLCOMMENT,
HL_KEYWORD1,
HL_KEYWORD2,
HL_STRING,
HL_NUMBER,
HL_MATCH
};
#define HL_HIGHLIGHT_NUMBERS (1 << 0)
#define HL_HIGHLIGHT_STRINGS (1 << 1)
/*** data ***/
struct editorSyntax
{
char *filetype;
char **filematch;
char **keywords;
char *singleline_comment_start;
char *multiline_comment_start;
char *multiline_comment_end;
int flags;
};
typedef struct erow
{
int idx;
int size;
int rsize; //render size
char *chars;
char *render;
unsigned char *hl;
int hl_open_comment;
} erow;
struct editorConfig
{
int cx, cy; // cursor position, current line
int rx;
int rowoff;
int coloff;
int screenrows;
int screencols;
int numrows; // 0 or 1
erow *row;
int dirty;
char *filename;
char statusmsg[80];
time_t statusmsg_time;
struct editorSyntax *syntax;
struct termios orig_termios;
};
struct editorConfig E;
/*** filetypes ***/
char *C_HL_extensions[] = {".c", ".h", ".cpp", NULL};
char *C_HL_keywords[] = {
"switch", "if", "while", "for", "break", "continue", "return", "else",
"struct", "union", "typedef", "static", "enum", "class", "case",
"int|", "long|", "double|", "float|", "char|", "unsigned|", "signed|",
"void|", NULL};
struct editorSyntax HLDB[] = {
{"c",
C_HL_extensions,
C_HL_keywords,
"//", "/*", "*/",
HL_HIGHLIGHT_NUMBERS | HL_HIGHLIGHT_STRINGS},
};
#define HLDB_ENTRIES (sizeof(HLDB) / sizeof(HLDB[0]))
/*** prototypes ***/
void editorSetStatusMessage(const char *fmt, ...);
void editorRefreshScreen();
char *editorPrompt(char *prompt, void (*callback)(char *, int));
/*** terminal ***/
void die(const char *s)
{
write(STDOUT_FILENO, "\x1b[2J", 4);
write(STDOUT_FILENO, "\x1b[H", 3);
perror(s);
exit(1);
}
void disableRawMode()
{
if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &E.orig_termios) == -1)
{
die("tcsetattr");
}
}
void enableRawMode()
{
if (tcgetattr(STDIN_FILENO, &E.orig_termios) == -1)
die("tcgetattr");
atexit(disableRawMode);
// use it to register our disableRawMode() function to be called automatically when the program exits
struct termios raw = E.orig_termios;
raw.c_iflag &= ~(BRKINT | ICRNL | INPCK | ISTRIP | IXON);
raw.c_oflag &= ~(OPOST);
raw.c_cflag |= (CS8);
raw.c_lflag &= ~(ECHO | ICANON | IEXTEN | ISIG);
raw.c_cc[VMIN] = 0;
raw.c_cc[VTIME] = 1;
if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &raw) == -1)
die("tcsetattr");
}
int editorReadKey()
{
int nread;
char c;
while ((nread = read(STDIN_FILENO, &c, 1)) != 1)
{
if (nread == -1 && errno != EAGAIN)
die("read");
}
if (c == '\x1b')
{
char seq[3];
if (read(STDIN_FILENO, &seq[0], 1) != 1)
return '\x1b';
if (read(STDIN_FILENO, &seq[1], 1) != 1)
return '\x1b';
if (seq[0] == '[')
{
if (seq[1] >= '0' && seq[1] <= '9')
{
if (read(STDIN_FILENO, &seq[2], 1) != 1)
return '\x1b';
if (seq[2] == '~')
{
// pageup and pagedown <esc>[5~ and <esc>[6~
switch (seq[1])
{
case '1':
return HOME_KEY;
case '3':
return DEL_KEY;
//<esc>[3~
case '4':
return END_KEY;
case '5':
return PAGE_UP;
case '6':
return PAGE_DOWN;
case '7':
return HOME_KEY;
case '8':
return END_KEY;
}
}
}
else
{
switch (seq[1])
{
case 'A':
return ARROW_UP;
case 'B':
return ARROW_DOWN;
case 'C':
return ARROW_RIGHT;
case 'D':
return ARROW_LEFT;
case 'H':
return HOME_KEY;
case 'F':
return END_KEY;
}
}
}
else if (seq[0] == 'O')
{
switch (seq[1])
{
case 'H':
return HOME_KEY;
case 'F':
return END_KEY;
}
}
return '\x1b';
}
else
{
return c;
}
}
int getCursorPosition(int *rows, int *cols)
{
char buf[32];
unsigned int i = 0;
if (write(STDOUT_FILENO, "\x1b[6n", 4) != 4)
return -1;
while (i < sizeof(buf) - 1)
{
if (read(STDIN_FILENO, &buf[i], 1) != 1)
break;
if (buf[i] == 'R')
break;
i++;
}
buf[i] = '\0';
if (buf[0] != '\x1b' || buf[1] != '[')
return -1;
if (sscanf(&buf[2], "%d;%d", rows, cols) != 2)
return -1;
return 0;
}
int getWindowSize1(int *rows, int *cols)
{
struct winsize ws;
if (ioctl(STDIN_FILENO, TIOCGWINSZ, &ws) == -1 || ws.ws_col == 0)
{
return -1;
}
else
{
*cols = ws.ws_col;
*rows = ws.ws_row;
return 0;
}
}
int getWindowSize(int *rows, int *cols)
{
struct winsize ws;
if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) == -1 || ws.ws_col == 0)
{
if (write(STDOUT_FILENO, "\x1b[999C\x1b[999B", 12) != 12)
return -1;
return getCursorPosition(rows, cols);
}
else
{
*cols = ws.ws_col;
*rows = ws.ws_row;
return 0;
}
}
/*** syntax highlighting ***/
int is_separator(int c)
{
return isspace(c) || c == '\0' || strchr(",.()+-/*=~%<>[];", c) != NULL;
}
void editorUpdateSyntax(erow *row)
{
row->hl = realloc(row->hl, row->rsize);
memset(row->hl, HL_NORMAL, row->rsize);
// set all charaters to HI_NORMAL(0) by default
if (E.syntax == NULL)
return;
char **keywords = E.syntax->keywords;
char *scs = E.syntax->singleline_comment_start;
char *mcs = E.syntax->multiline_comment_start;
char *mce = E.syntax->multiline_comment_end;
int scs_len = scs ? strlen(scs) : 0;
int mcs_len = mcs ? strlen(mcs) : 0;
int mce_len = mce ? strlen(mce) : 0;
int prev_sep = 1;
int in_string = 0;
int in_comment = (row->idx > 0 && E.row[row->idx - 1].hl_open_comment);
int i = 0;
while (i < row->rsize)
{
char c = row->render[i];
unsigned char prev_hl = (i > 0) ? row->hl[i - 1] : HL_NORMAL;
if (scs_len && !in_string && !in_comment)
{
if (!strncmp(&row->render[i], scs, scs_len))
{
memset(&row->hl[i], HL_COMMENT, row->rsize - i);
break;
}
}
if (mcs_len && mce_len && !in_string)
{
if (in_comment)
{
row->hl[i] = HL_MLCOMMENT;
if (!strncmp(&row->render[i], mce, mce_len))
{
memset(&row->hl[i], HL_MLCOMMENT, mce_len);
i += mce_len;
in_comment = 0;
prev_sep = 1;
continue;
}
else
{
i++;
continue;
}
}
else if (!strncmp(&row->render[i], mcs, mcs_len))
{
memset(&row->hl[i], HL_MLCOMMENT, mcs_len);
i += mcs_len;
in_comment = 1;
continue;
}
}
if (E.syntax->flags & HL_HIGHLIGHT_STRINGS)
{
if (in_string)
{
row->hl[i] = HL_STRING;
if (c == '\\' && i + 1 < row->rsize)
{
row->hl[i + 1] = HL_STRING;
i += 2;
continue;
}
if (c == in_string)
in_string = 0;
i++;
prev_sep = 1;
continue;
}
else
{
if (c == '"' || c == '\'')
{
in_string = c;
row->hl[i] = HL_STRING;
i++;
continue;
}
}
}
if (E.syntax->flags & HL_HIGHLIGHT_NUMBERS)
{
if ((isdigit(c) && (prev_sep || prev_hl == HL_NUMBER)) ||
(c == '.' && prev_hl == HL_NUMBER))
{
row->hl[i] = HL_NUMBER;
i++;
prev_sep = 0;
continue;
}
}
if (prev_sep)
{
int j;
for (j = 0; keywords[j]; j++)
{
int klen = strlen(keywords[j]);
int kw2 = keywords[j][klen - 1] == '|';
if (kw2)
klen--;
if (!strncmp(&row->render[i], keywords[j], klen) &&
is_separator(row->render[i + klen]))
{
memset(&row->hl[i], kw2 ? HL_KEYWORD2 : HL_KEYWORD1, klen);
i += klen;
break;
}
}
if (keywords[j] != NULL)
{
prev_sep = 0;
continue;
}
}
prev_sep = is_separator(c);
i++;
}
int changed = (row->hl_open_comment != in_comment);
row->hl_open_comment = in_comment;
if (changed && row->idx + 1 < E.numrows)
editorUpdateSyntax(&E.row[row->idx + 1]);
}
int editorSyntaxToColor(int hl)
{
switch (hl)
{
case HL_COMMENT:
case HL_MLCOMMENT:
return 36;
//cyan
case HL_KEYWORD1:
return 33;
case HL_KEYWORD2:
return 32;
case HL_STRING:
return 35;
//magenta
case HL_NUMBER:
return 31;
//red
case HL_MATCH:
return 34;
default:
return 37;
// white
}
}
void editorSelectSyntaxHighlight()
{
E.syntax = NULL;
if (E.filename == NULL)
return;
char *ext = strrchr(E.filename, '.');
for (unsigned int j = 0; j < HLDB_ENTRIES; j++)
{
struct editorSyntax *s = &HLDB[j];
unsigned int i = 0;
while (s->filematch[i])
{
int is_ext = (s->filematch[i][0] == '.');
if ((is_ext && ext && !strcmp(ext, s->filematch[i])) ||
(!is_ext && strstr(E.filename, s->filematch[i])))
{
E.syntax = s;
int filerow;
for (filerow = 0; filerow < E.numrows; filerow++)
{
editorUpdateSyntax(&E.row[filerow]);
}
return;
}
i++;
}
}
}
/*** row operations ***/
int editorRowCxToRx(erow *row, int cx)
{
int rx = 0;
int j;
for (j = 0; j < cx; j++)
{
if (row->chars[j] == '\t')
rx += (KILO_TAB_STOP - 1) - (rx % KILO_TAB_STOP);
rx++;
}
return rx;
}
int editorRowRxToCx(erow *row, int rx)
{
int cur_rx = 0;
int cx;
for (cx = 0; cx < row->size; cx++)
{
if (row->chars[cx] == '\t')
cur_rx += (KILO_TAB_STOP - 1) - (cur_rx % KILO_TAB_STOP);
cur_rx++;
if (cur_rx > rx)
return cx;
}
return cx;
}
void editorUpdateRow(erow *row)
{
int tabs = 0;
int j;
for (j = 0; j < row->size; j++)
if (row->chars[j] == '\t')
tabs++;
free(row->render);
row->render = malloc(row->size + tabs * (KILO_TAB_STOP - 1) + 1);
int idx = 0;
for (j = 0; j < row->size; j++)
{
if (row->chars[j] == '\t')
{
row->render[idx++] = ' ';
while (idx % KILO_TAB_STOP != 0)
row->render[idx++] = ' ';
}
else
{
row->render[idx++] = row->chars[j];
}
}
row->render[idx] = '\0';
row->rsize = idx;
editorUpdateSyntax(row);
}
void editorInsertRow(int at, char *s, size_t len)
{
if (at < 0 || at > E.numrows)
return;
E.row = realloc(E.row, sizeof(erow) * (E.numrows + 1));
memmove(&E.row[at + 1], &E.row[at], sizeof(erow) * (E.numrows - at));
for (int j = at + 1; j <= E.numrows; j++)
E.row[j].idx++;
E.row[at].idx = at;
E.row[at].size = len;
E.row[at].chars = malloc(len + 1);
memcpy(E.row[at].chars, s, len);
E.row[at].chars[len] = '\0';
E.row[at].rsize = 0;
E.row[at].render = NULL;
E.row[at].hl = NULL;
E.row[at].hl_open_comment = 0;
editorUpdateRow(&E.row[at]);
E.numrows++;
E.dirty++;
}
void editorFreeRow(erow *row)
{
free(row->render);
free(row->chars);
free(row->hl);
}
void editorDelRow(int at)
{
if (at < 0 || at >= E.numrows)
return;
editorFreeRow(&E.row[at]);
memmove(&E.row[at], &E.row[at + 1], sizeof(erow) * (E.numrows - at - 1));
for (int j = at; j < E.numrows - 1; j++)
E.row[j].idx--;
E.numrows--;
E.dirty++;
}
void editorRowInsertChar(erow *row, int at, int c)
{
if (at < 0 || at > row->size)
at = row->size;
// at is the index we want to insert into
row->chars = realloc(row->chars, row->size + 2);
memmove(&row->chars[at + 1], &row->chars[at], row->size - at + 1);
// memmove to make room for the new charater
row->size++;
row->chars[at] = c;
editorUpdateRow(row);
E.dirty++;
}
void editorRowAppendString(erow *row, char *s, size_t len)
{ //append a string to the end of row
row->chars = realloc(row->chars, row->size + len + 1);
memcpy(&row->chars[row->size], s, len);
row->size += len;
row->chars[row->size] = '\0';
editorUpdateRow(row);
E.dirty++;
}
void editorRowDelChar(erow *row, int at)
{
if (at < 0 || at >= row->size)
return;
memmove(&row->chars[at], &row->chars[at + 1], row->size - at);
row->size--;
editorUpdateRow(row);
E.dirty++;
}
/*** editor operations ***/
void editorInsertChar(int c)
{
if (E.cy == E.numrows)
{
editorInsertRow(E.numrows, "", 0);
}
editorRowInsertChar(&E.row[E.cy], E.cx, c);
E.cx++;
}
void editorInsertNewline()
{
if (E.cx == 0)
{
editorInsertRow(E.cy, "", 0);
}
else
{
erow *row = &E.row[E.cy];
editorInsertRow(E.cy + 1, &row->chars[E.cx], row->size - E.cx);
row = &E.row[E.cy];
row->size = E.cx;
row->chars[row->size] = '\0';
editorUpdateRow(row);
}
E.cy++;
E.cx = 0;
}
void editorDelChar()
{
if (E.cy == E.numrows)
return;
if (E.cx == 0 && E.cy == 0)
return;
erow *row = &E.row[E.cy];
if (E.cx > 0)
{
editorRowDelChar(row, E.cx - 1);
E.cx--;
}
else
// means E.cx == 0
{
E.cx = E.row[E.cy - 1].size;
editorRowAppendString(&E.row[E.cy - 1], row->chars, row->size);
editorDelRow(E.cy);
E.cy--;
}
}
/*** file i/o ***/
char *editorRowsToString(int *buflen)
{
//converts arow into a single string
int totlen = 0;
int j;
for (j = 0; j < E.numrows; j++)
totlen += E.row[j].size + 1;
*buflen = totlen;
char *buf = malloc(totlen);
char *p = buf;
for (j = 0; j < E.numrows; j++)
{
memcpy(p, E.row[j].chars, E.row[j].size);
p += E.row[j].size;
*p = '\n';
p++;
}
return buf;
}
void editorOpen(char *filename)
{
free(E.filename);
E.filename = strdup(filename);
//strdup: makes a copy of the given string
editorSelectSyntaxHighlight();
FILE *fp = fopen(filename, "r");
if (!fp)
die("fopen");
char *line = NULL;
size_t linecap = 0;
//line capacity
ssize_t linelen;
while ((linelen = getline(&line, &linecap, fp)) != -1)
{
while (linelen > 0 && (line[linelen - 1] == '\n' ||
line[linelen - 1] == '\r'))
linelen--;
editorInsertRow(E.numrows, line, linelen);
}
free(line);
fclose(fp);
E.dirty = 0;
}
void editorSave()
{
if (E.filename == NULL)
{
E.filename = editorPrompt("Save as: %s (ESC to cancel)", NULL);
if (E.filename == NULL)
{
editorSetStatusMessage("Save aborted");
return;
}
editorSelectSyntaxHighlight();
}
int len;
char *buf = editorRowsToString(&len);
int fd = open(E.filename, O_RDWR | O_CREAT, 0644);
//reading and writing , 0644: permissions
if (fd != -1)
{
if (ftruncate(fd, len) != -1)
//sets the file��s size to the specified length
{
if (write(fd, buf, len) == len)
{
close(fd);
free(buf);
E.dirty = 0;
editorSetStatusMessage("%d bytes written to disk", len);
return;
}
}
close(fd);
}
free(buf);
editorSetStatusMessage("Can't save! I/O error: %s", strerror(errno));
}
/*** find ***/
void editorFindCallback(char *query, int key)
{
static int last_match = -1;
static int direction = 1;
static int saved_hl_line;
static char *saved_hl = NULL;
if (saved_hl)
{
memcpy(E.row[saved_hl_line].hl, saved_hl, E.row[saved_hl_line].rsize);
free(saved_hl);
//malloc()��d memory is guaranteed to be free()��d
saved_hl = NULL;
}
if (key == '\r' || key == '\x1b')
{
//Enter or Escape
last_match = -1;
direction = 1;
return;
}
else if (key == ARROW_RIGHT || key == ARROW_DOWN)
{
direction = 1;
}
else if (key == ARROW_LEFT || key == ARROW_UP)
{
direction = -1;
}
else
{
last_match = -1;
direction = 1;
}
if (last_match == -1)
direction = 1;
int current = last_match;
int i;
for (i = 0; i < E.numrows; i++)
{
current += direction;
if (current == -1)
current = E.numrows - 1;
else if (current == E.numrows)
current = 0;
erow *row = &E.row[current];
char *match = strstr(row->render, query);
if (match)
{
last_match = current;
E.cy = current;
E.cx = editorRowRxToCx(row, match - row->render);
E.rowoff = E.numrows;
saved_hl_line = current;
saved_hl = malloc(row->rsize);
memcpy(saved_hl, row->hl, row->rsize);
memset(&row->hl[match - row->render], HL_MATCH, strlen(query));
break;
}
}
}
void editorFind()
{
int saved_cx = E.cx;
int saved_cy = E.cy;
int saved_coloff = E.coloff;
int saved_rowoff = E.rowoff;
char *query = editorPrompt("Search: %s (Use ESC/Arrows/Enter)",
editorFindCallback);
if (query)
{
free(query);
}
else
{
E.cx = saved_cx;
E.cy = saved_cy;
E.coloff = saved_coloff;
E.rowoff = saved_rowoff;
}
}
/*** append buffer ***/
struct abuf
{
char *b;
int len;
};
#define ABUF_INIT \
{ \
NULL, 0 \
}
void abAppend(struct abuf *ab, const char *s, int len)
{
char *new = realloc(ab->b, ab->len + len);
if (new == NULL)
return;
memcpy(&new[ab->len], s, len);
ab->b = new;
ab->len += len;
}
void abFree(struct abuf *ab)
{
free(ab->b);
}
/*** output ***/
void editorScroll()
{
E.rx = 0;
if (E.cy < E.numrows)
{
E.rx = editorRowCxToRx(&E.row[E.cy], E.cx);
}
if (E.cy < E.rowoff)
{
E.rowoff = E.cy;
}
if (E.cy >= E.rowoff + E.screenrows)
{
E.rowoff = E.cy - E.screenrows + 1;
}
if (E.rx < E.coloff)
{
E.coloff = E.rx;
}
if (E.rx >= E.coloff + E.screencols)
{
E.coloff = E.rx - E.screencols + 1;
}
}
void editorDrawRows(struct abuf *ab)
{
int y;
for (y = 0; y < E.screenrows; y++)
{
int filerow = y + E.rowoff;
if (filerow >= E.numrows)
{
if (E.numrows == 0 && y == E.screenrows / 3)
{
char welcome[80];
int welcomelen = snprintf(welcome, sizeof(welcome),
"Kilo editor -- version %s", KILO_VERSION);
if (welcomelen > E.screencols)
welcomelen = E.screencols;
// center the welcome info
int padding = (E.screencols - welcomelen) / 2;
if (padding)
{
abAppend(ab, "~", 1);
padding--;
}
while (padding--)
{
abAppend(ab, " ", 1);
}
abAppend(ab, welcome, welcomelen);
}
else
{
//write(STDOUT_FILENO, "~", 1);
abAppend(ab, "~", 1);
}
}
else
{
int len = E.row[filerow].rsize - E.coloff;
if (len < 0)
len = 0;
if (len > E.screencols)
len = E.screencols;
char *c = &E.row[filerow].render[E.coloff];
unsigned char *hl = &E.row[filerow].hl[E.coloff];
int current_color = -1;
int j;
for (j = 0; j < len; j++)
{
if (iscntrl(c[j]))
{
char sym = (c[j] <= 26) ? '@' + c[j] : '?';
abAppend(ab, "\x1b[7m", 4);
abAppend(ab, &sym, 1);
abAppend(ab, "\x1b[m", 3);
if (current_color != -1)
{
char buf[16];
int clen = snprintf(buf, sizeof(buf), "\x1b[%dm", current_color);
abAppend(ab, buf, clen);
}
}
else if (hl[j] == HL_NORMAL)
{
if (current_color != -1)
{
abAppend(ab, "\x1b[39m", 5);
current_color = -1;
}
abAppend(ab, &c[j], 1);
}
else
{
int color = editorSyntaxToColor(hl[j]);
if (color != current_color)
{
current_color = color;
char buf[16];
int clen = snprintf(buf, sizeof(buf), "\x1b[%dm", color);
abAppend(ab, buf, clen);
}
abAppend(ab, &c[j], 1);
}
}
abAppend(ab, "\x1b[39m", 5);
}
abAppend(ab, "\x1b[K", 3);
// K means `erase in line`
//write(STDOUT_FILENO, "\r\n", 2);
abAppend(ab, "\r\n", 2);
}
}
void editorDrawStatusBar(struct abuf *ab)
{
abAppend(ab, "\x1b[7m", 4);
char status[80], rstatus[80];
int len = snprintf(status, sizeof(status), "%.20s - %d lines %s",
E.filename ? E.filename : "[No Name]", E.numrows,
E.dirty ? "(modified)" : "");
int rlen = snprintf(rstatus, sizeof(rstatus), "%s | %d/%d",
E.syntax ? E.syntax->filetype : "no file type", E.cy + 1, E.numrows);
if (len > E.screencols)
len = E.screencols;
abAppend(ab, status, len);
while (len < E.screencols)
{
if (E.screencols - len == rlen)
{
abAppend(ab, rstatus, rlen);
break;
}
else
{
abAppend(ab, " ", 1);
len++;
}
}
abAppend(ab, "\x1b[m", 3);
abAppend(ab, "\r\n", 2);
}
void editorDrawMessageBar(struct abuf *ab)
{
abAppend(ab, "\x1b[K", 3);
int msglen = strlen(E.statusmsg);
if (msglen > E.screencols)
msglen = E.screencols;
if (msglen && time(NULL) - E.statusmsg_time < 5)
abAppend(ab, E.statusmsg, msglen);
}
void editorRefreshScreen()
{
editorScroll();
struct abuf ab = ABUF_INIT;
//write(STDOUT_FILENO, "\x1b[2J", 4);
//write(STDOUT_FILENO, "\x1b[H", 3);
abAppend(&ab, "\x1b[?25l", 6);
//abAppend(&ab, "\x1b[2J", 4);
// remove the clear entire screen escape sequence
abAppend(&ab, "\x1b[H", 3);
editorDrawRows(&ab);
editorDrawStatusBar(&ab);
editorDrawMessageBar(&ab);
char buf[32];
snprintf(buf, sizeof(buf), "\x1b[%d;%dH", (E.cy - E.rowoff) + 1,
(E.rx - E.coloff) + 1);
abAppend(&ab, buf, strlen(buf));
//write(STDOUT_FILENO, "\x1b[H", 3);
//abAppend(&ab, "\x1b[H", 3);
abAppend(&ab, "\x1b[?25h", 6);
write(STDOUT_FILENO, ab.b, ab.len);
//write the buffer's contents out to standard output
abFree(&ab);
}
void editorSetStatusMessage(const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
vsnprintf(E.statusmsg, sizeof(E.statusmsg), fmt, ap);
va_end(ap);
E.statusmsg_time = time(NULL);
}
/*** input ***/
char *editorPrompt(char *prompt, void (*callback)(char *, int))
{
size_t bufsize = 128;
char *buf = malloc(bufsize);
size_t buflen = 0;
buf[0] = '\0';
while (1)
{
editorSetStatusMessage(prompt, buf);
editorRefreshScreen();
int c = editorReadKey();
if (c == DEL_KEY || c == CTRL_KEY('h') || c == BACKSPACE)
{
if (buflen != 0)
buf[--buflen] = '\0';
}
else if (c == '\x1b')
{
editorSetStatusMessage("");
if (callback)
callback(buf, c);
free(buf);
return NULL;
}
else if (c == '\r')
{
if (buflen != 0)
{
editorSetStatusMessage("");
if (callback)
callback(buf, c);
return buf;
}
}
else if (!iscntrl(c) && c < 128)
{
if (buflen == bufsize - 1)
{
bufsize *= 2;
buf = realloc(buf, bufsize);
}
buf[buflen++] = c;
buf[buflen] = '\0';
}
if (callback)
callback(buf, c);
}
}
void editorMoveCursor(int key)
{
erow *row = (E.cy >= E.numrows) ? NULL : &E.row[E.cy];
switch (key)
{
case ARROW_LEFT:
if (E.cx != 0)
{
E.cx--;
}
else if (E.cy > 0)
{
E.cy--;
E.cx = E.row[E.cy].size;
}
break;
case ARROW_RIGHT:
if (row && E.cx < row->size)
{
E.cx++;
}
else if (row && E.cx == row->size)
{
E.cy++;
E.cx = 0;
}
break;
case ARROW_UP:
if (E.cy != 0)
{
E.cy--;
}
break;
case ARROW_DOWN:
if (E.cy < E.numrows)
{
E.cy++;
}
break;
}
row = (E.cy >= E.numrows) ? NULL : &E.row[E.cy];
int rowlen = row ? row->size : 0;
if (E.cx > rowlen)
{
E.cx = rowlen;
}
}
void editorProcessKeypress()
{
static int quit_times = KILO_QUIT_TIMES;
int c = editorReadKey();
switch (c)
{
case '\r':
//Enter key
editorInsertNewline();
break;
case CTRL_KEY('q'):
if (E.dirty && quit_times > 0)
{
editorSetStatusMessage("WARNING!!! File has unsaved changes. "
"Press Ctrl-Q %d more times to quit.",
quit_times);
quit_times--;
return;
}
write(STDOUT_FILENO, "\x1b[2J", 4);
write(STDOUT_FILENO, "\x1b[H", 3);
exit(0);
break;
case CTRL_KEY('s'):
editorSave();
break;
case HOME_KEY:
E.cx = 0;
break;
case END_KEY:
if (E.cy < E.numrows)
E.cx = E.row[E.cy].size;
break;
case CTRL_KEY('f'):
editorFind();
break;
case BACKSPACE:
case CTRL_KEY('h'):
case DEL_KEY:
if (c == DEL_KEY)
editorMoveCursor(ARROW_RIGHT);
editorDelChar();
break;
case PAGE_UP:
case PAGE_DOWN:
{
if (c == PAGE_UP)
{
E.cy = E.rowoff;
}
else if (c == PAGE_DOWN)
{
E.cy = E.rowoff + E.screenrows - 1;
if (E.cy > E.numrows)
E.cy = E.numrows;
}
int times = E.screenrows;
while (times--)
editorMoveCursor(c == PAGE_UP ? ARROW_UP : ARROW_DOWN);
}
break;
case ARROW_UP:
case ARROW_DOWN:
case ARROW_LEFT:
case ARROW_RIGHT:
editorMoveCursor(c);
break;
case CTRL_KEY('l'):
case '\x1b':
break;
default:
editorInsertChar(c);
break;
}
quit_times = KILO_QUIT_TIMES;
}
/*** init ***/
void initEditor()
{
E.cx = 0;
E.cy = 0;
E.rx = 0;
E.rowoff = 0;
E.coloff = 0;
E.numrows = 0;
E.row = NULL;
E.dirty = 0;
E.filename = NULL;
E.statusmsg[0] = '\0';
E.statusmsg_time = 0;
E.syntax = NULL;
if (getWindowSize(&E.screenrows, &E.screencols) == -1)
die("getWindowSize");
E.screenrows -= 2;
//2 lines for status bar
}
int main(int argc, char *argv[])
{
enableRawMode();
//enable raw mode, type `reset` to exit the raw mode to canonical mode
initEditor();
if (argc >= 2)
{
editorOpen(argv[1]);
}
editorSetStatusMessage(
"HELP: Ctrl-S = save | Ctrl-Q = quit | Ctrl-F = find");
while (1)
{
editorRefreshScreen();
editorProcessKeypress();
}
return 0;
}