kilo TextEditor-2
文章目录
-
- 文本查看器
-
- 行查看
- 多行显示
- 垂直滚动
- 水平滚动
- 限制向右滚动
- 将光标对齐到行尾
- 在行首向左移动 && 在行末向右移动
- 渲染Tab
- Tab和光标
- Page滚动文件页面
- End 移动到行尾
- 状态栏
- 状态消息
文本查看器
行查看
存储一行文本的数据类型
typedef struct erow {
int size;
char *chars;
} erow;
struct editorConfig {
int cx, cy;
int screenrows;
int screencols;
int numrows;
erow row;
struct termios orig_termios;
};
struct editorConfig E;
void initEditor() {
E.cx = 0;
E.cy = 0;
E.numrows = 0;
if (getWindowSize(&E.screenrows, &E.screencols) == -1) die("getWindowSize");
}
打开文件，读一行
#include 显示行
void editorDrawRows(struct abuf *ab) {
int y;
for (y = 0; y < E.screenrows; y++) {
if (y >= E.numrows) {
//显示完文本后
//如果文件没有内容才显示欢迎信息
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;
int padding = (E.screencols - welcomelen) / 2;
if (padding) {
abAppend(ab, "~", 1);
padding--;
}
while (padding--) abAppend(ab, " ", 1);
abAppend(ab, welcome, welcomelen);
} else {
abAppend(ab, "~", 1);
}
} else {
//显示文本
int len = E.row.size;
if (len > E.screencols) len = E.screencols;
abAppend(ab, E.row.chars, len);
}
abAppend(ab, "\x1b[K", 3);
if (y < E.screenrows - 1) {
abAppend(ab, "\r\n", 2);
}
}
}
//功能测试宏，用于提高可移植性
#define _DEFAULT_SOURCE
#define _BSD_SOURCE
#define _GNU_SOURCE
多行显示
需要动态分配的结构体数组
struct editorConfig {
int cx, cy;
int screenrows;
int screencols;
int numrows;
erow *row;
struct termios orig_termios;
};
void initEditor() {
E.cx = 0;
E.cy = 0;
E.numrows = 0;
E.row = NULL;
if (getWindowSize(&E.screenrows, &E.screencols) == -1) die("getWindowSize");
}
读多行
void editorAppendRow(char *s, size_t len) {
E.row = realloc(E.row, sizeof(erow) * (E.numrows + 1));
int at = E.numrows;
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.numrows++;
}
void editorOpen(char *filename) {
FILE *fp = fopen(filename, "r");
if (!fp) die("fopen");
char *line = NULL;
size_t linecap = 0;
ssize_t linelen;
while ((linelen = getline(&line, &linecap, fp)) != -1) {
while (linelen > 0 && (line[linelen - 1] == '\n' || line[linelen - 1] == '\r'))
linelen--;
editorAppendRow(line, linelen);
}
free(line);
fclose(fp);
}
显示多行
void editorDrawRows(struct abuf *ab) {
int y;
for (y = 0; y < E.screenrows; y++) {
if (y >= 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;
int padding = (E.screencols - welcomelen) / 2;
if (padding) {
abAppend(ab, "~", 1);
padding--;
}
while (padding--) abAppend(ab, " ", 1);
abAppend(ab, welcome, welcomelen);
} else {
abAppend(ab, "~", 1);
}
} else {
//显示第y行文本
int len = E.row[y].size;
if (len > E.screencols) len = E.screencols;
abAppend(ab, E.row[y].chars, len);
}
abAppend(ab, "\x1b[K", 3);
if (y < E.screenrows - 1) {
abAppend(ab, "\r\n", 2);
}
}
}
垂直滚动
滚动浏览文件，需要设置当前滚动到文件的哪一行了
struct editorConfig {
int cx, cy;
int rowoff;
int screenrows;
int screencols;
int numrows;
erow *row;
struct termios orig_termios;
};
void initEditor() {
E.cx = 0;
E.cy = 0;
E.rowoff = 0;
E.numrows = 0;
E.row = NULL;
if (getWindowSize(&E.screenrows, &E.screencols) == -1) die("getWindowSize");
}
将滚动行偏移量纳入显示行的影响参数中
void editorDrawRows(struct abuf *ab) {
int y;
for (y = 0; y < E.screenrows; y++) {
//filerow是当前屏的第y行在文件中的行编号
int filerow = y + E.rowoff;
if (filerow >= E.numrows) {
//在超出了文件所有行的地方画波浪号和欢迎信息
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;
int padding = (E.screencols - welcomelen) / 2;
if (padding) {
abAppend(ab, "~", 1);
padding--;
}
while (padding--) abAppend(ab, " ", 1);
abAppend(ab, welcome, welcomelen);
} else {
abAppend(ab, "~", 1);
}
} else {
//文件中对应的行
int len = E.row[filerow].size;
if (len > E.screencols) len = E.screencols;
abAppend(ab, E.row[filerow].chars, len);
}
abAppend(ab, "\x1b[K", 3);
if (y < E.screenrows - 1) {
abAppend(ab, "\r\n", 2);
}
}
}
光标引导滚动，此时光标看作文件中的光标，而不是屏幕中的光标
void editorScroll() {
if (E.cy < E.rowoff) {
E.rowoff = E.cy;
}
if (E.cy >= E.rowoff + E.screenrows) {
E.rowoff = E.cy - E.screenrows + 1;
}
}
void editorRefreshScreen() {
//刷新屏幕时更新滚动情况
editorScroll();
struct abuf ab = ABUF_INIT;
abAppend(&ab, "\x1b[?25l", 6);
abAppend(&ab, "\x1b[H", 3);
editorDrawRows(&ab);
char buf[32];
//更新光标在屏幕中的位置
snprintf(buf, sizeof(buf), "\x1b[%d;%dH", (E.cy - E.rowoff) + 1, E.cx + 1);
abAppend(&ab, buf, strlen(buf));
abAppend(&ab, "\x1b[?25h", 6);
write(STDOUT_FILENO, ab.b, ab.len);
abFree(&ab);
}
void editorMoveCursor(int key) {
switch (key) {
case ARROW_LEFT:
if (E.cx != 0) {
E.cx--;
}
break;
case ARROW_RIGHT:
if (E.cx != E.screencols - 1) {
E.cx++;
}
break;
case ARROW_UP:
if (E.cy != 0) {
E.cy--;
}
break;
case ARROW_DOWN:
//将光标限制在文件行数内
if (E.cy < E.numrows) {
E.cy++;
}
break;
}
}
水平滚动
struct editorConfig {
int cx, cy;
int rowoff;
int coloff;
int screenrows;
int screencols;
int numrows;
erow *row;
struct termios orig_termios;
};
void initEditor() {
E.cx = 0;
E.cy = 0;
E.rowoff = 0;
E.coloff = 0;
E.numrows = 0;
E.row = NULL;
if (getWindowSize(&E.screenrows, &E.screencols) == -1) die("getWindowSize");
}
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;
int padding = (E.screencols - welcomelen) / 2;
if (padding) {
abAppend(ab, "~", 1);
padding--;
}
while (padding--) abAppend(ab, " ", 1);
abAppend(ab, welcome, welcomelen);
} else {
abAppend(ab, "~", 1);
}
} else {
//裁剪掉水平滚动下当前行消失的列
int len = E.row[filerow].size - E.coloff;
if (len < 0) len = 0;
if (len > E.screencols) len = E.screencols;
//控制行字符串开头 E.coloff
abAppend(ab, &E.row[filerow].chars[E.coloff], len);
}
abAppend(ab, "\x1b[K", 3);
if (y < E.screenrows - 1) {
abAppend(ab, "\r\n", 2);
}
}
}
void editorScroll() {
if (E.cy < E.rowoff) {
E.rowoff = E.cy;
}
if (E.cy >= E.rowoff + E.screenrows) {
E.rowoff = E.cy - E.screenrows + 1;
}
//控制光标水平滚动范围
if (E.cx < E.coloff) {
E.coloff = E.cx;
}
if (E.cx >= E.coloff + E.screencols) {
E.coloff = E.cx - E.screencols + 1;
}
}
void editorMoveCursor(int key) {
switch (key) {
case ARROW_LEFT:
if (E.cx != 0) {
E.cx--;
}
break;
case ARROW_RIGHT:
//开放超过屏幕右边缘 if (E.cx != E.screencols - 1) {
E.cx++;
break;
case ARROW_UP:
if (E.cy != 0) {
E.cy--;
}
break;
case ARROW_DOWN:
if (E.cy < E.numrows) {
E.cy++;
}
break;
}
}
void editorRefreshScreen() {
editorScroll();
struct abuf ab = ABUF_INIT;
abAppend(&ab, "\x1b[?25l", 6);
abAppend(&ab, "\x1b[H", 3);
editorDrawRows(&ab);
char buf[32];
snprintf(buf, sizeof(buf), "\x1b[%d;%dH", (E.cy - E.rowoff) + 1, (E.cx - E.coloff) + 1);
abAppend(&ab, buf, strlen(buf));
abAppend(&ab, "\x1b[?25h", 6);
write(STDOUT_FILENO, ab.b, ab.len);
abFree(&ab);
}
限制向右滚动
有两种情况限制向右滚屏：1.到达行末 2.到达文件最后一行的下一行
void editorMoveCursor(int key) {
//是否到达文件最后一行的下一行
erow *row = (E.cy >= E.numrows) ? NULL : &E.row[E.cy];
switch (key) {
case ARROW_LEFT:
if (E.cx != 0) {
E.cx--;
}
break;
case ARROW_RIGHT:
//情况1+2判断
if (row && E.cx < row->size) {
E.cx++;
}
break;
case ARROW_UP:
if (E.cy != 0) {
E.cy--;
}
break;
case ARROW_DOWN:
if (E.cy < E.numrows) {
E.cy++;
}
break;
}
}
将光标对齐到行尾
限制光标只能在行尾内
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--;
}
break;
case ARROW_RIGHT:
if (row && E.cx < row->size) {
E.cx++;
}
break;
case ARROW_UP:
if (E.cy != 0) {
E.cy--;
}
break;
case ARROW_DOWN:
if (E.cy < E.numrows) {
E.cy++;
}
break;
}
//再次赋值是为了更新E.cy变化的情况
row = (E.cy >= E.numrows) ? NULL : &E.row[E.cy];
//限制列
int rowlen = row ? row->size : 0;
if (E.cx > rowlen) {
E.cx = rowlen;
}
}
在行首向左移动 && 在行末向右移动
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) {
//在行首向左移动的情况
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) {
//在行末向右移动的情况
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;
}
}
渲染Tab
设定Tab是由8个空格组成，计划在erow结构体中新增一个字符串用来存放该行渲染后的字符串的样子
typedef struct erow {
int size;
int rsize;//
char *chars;
char *render;//
} erow;
#define KILO_TAB_STOP 8
void editorUpdateRow(erow *row) {
int tabs = 0;
int j;
for (j = 0; j < row->size; j++)
//处理Tab
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;
}
void editorAppendRow(char *s, size_t len) {
E.row = realloc(E.row, sizeof(erow) * (E.numrows + 1));
int at = E.numrows;
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;
editorUpdateRow(&E.row[at]);
E.numrows++;
}
将显示行的内容换成渲染后字符串的内容
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;
int padding = (E.screencols - welcomelen) / 2;
if (padding) {
abAppend(ab, "~", 1);
padding--;
}
while (padding--) abAppend(ab, " ", 1);
abAppend(ab, welcome, welcomelen);
} else {
abAppend(ab, "~", 1);
}
} else {
//render替换chars
int len = E.row[filerow].rsize - E.coloff;
if (len < 0) len = 0;
if (len > E.screencols) len = E.screencols;
abAppend(ab, &E.row[filerow].render[E.coloff], len);
}
abAppend(ab, "\x1b[K", 3);
if (y < E.screenrows - 1) {
abAppend(ab, "\r\n", 2);
}
}
}
Tab和光标
当光标遇到Tab时，需要一次性跳过Tab，所以新增一个光标列坐标
struct editorConfig {
int cx, cy;
int rx;
int rowoff;
int coloff;
int screenrows;
int screencols;
int numrows;
erow *row;
struct termios orig_termios;
};
void initEditor() {
E.cx = 0;
E.cy = 0;
E.rx = 0;
E.rowoff = 0;
E.coloff = 0;
E.numrows = 0;
E.row = NULL;
if (getWindowSize(&E.screenrows, &E.screencols) == -1) die("getWindowSize");
}
替换滚动和刷新时E.cx的位置，因为rx表示的才是实际上光标的位置
void editorScroll() {
E.rx = 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 editorRefreshScreen() {
editorScroll();
struct abuf ab = ABUF_INIT;
abAppend(&ab, "\x1b[?25l", 6);
abAppend(&ab, "\x1b[H", 3);
editorDrawRows(&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));
abAppend(&ab, "\x1b[?25h", 6);
write(STDOUT_FILENO, ab.b, ab.len);
abFree(&ab);
}
cx转换成rz
制表符的作用：
原文：123456\t123 12345678\t123
结果：123456 123 12345678 123
那么考虑到后面有rx++，用(KILO_TAB_STOP - 1)（实际是8）减去前面字符已有的字符数（上面的例子分别是6和0）得到的就是制表符渲染后得到的空格数
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;
}
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;
}
}
Page滚动文件页面
void editorProcessKeypress() {
int c = editorReadKey();
switch (c) {
case CTRL_KEY('q'):
write(STDOUT_FILENO, "\x1b[2J", 4);
write(STDOUT_FILENO, "\x1b[H", 3);
exit(0);
break;
case HOME_KEY:
E.cx = 0;
break;
case END_KEY:
E.cx = E.screencols - 1;
break;
case PAGE_UP:
case PAGE_DOWN:
{
//原来是在光标上直接光标上下移动整个屏幕大小
//现在是在滚动偏移量（屏幕最顶行在文件中的偏移量）的基础上上下移动整个屏幕大小
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;
}
}
End 移动到行尾
void editorProcessKeypress() {
int c = editorReadKey();
switch (c) {
case CTRL_KEY('q'):
write(STDOUT_FILENO, "\x1b[2J", 4);
write(STDOUT_FILENO, "\x1b[H", 3);
exit(0);
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 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;
}
}
状态栏
负责呈现文件名、行数、列数等信息，在底部空出
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;
int padding = (E.screencols - welcomelen) / 2;
if (padding) {
abAppend(ab, "~", 1);
padding--;
}
while (padding--) abAppend(ab, " ", 1);
abAppend(ab, welcome, welcomelen);
} else {
abAppend(ab, "~", 1);
}
} else {
int len = E.row[filerow].rsize - E.coloff;
if (len < 0) len = 0;
if (len > E.screencols) len = E.screencols;
abAppend(ab, &E.row[filerow].render[E.coloff], len);
}
abAppend(ab, "\x1b[K", 3);
//if (y < E.screenrows - 1) {
abAppend(ab, "\r\n", 2);
}
}
void initEditor() {
E.cx = 0;
E.cy = 0;
E.rx = 0;
E.rowoff = 0;
E.coloff = 0;
E.numrows = 0;
E.row = NULL;
if (getWindowSize(&E.screenrows, &E.screencols) == -1) die("getWindowSize");
E.screenrows -= 1;//空出底部一行
}
void editorDrawStatusBar(struct abuf *ab) {
abAppend(ab, "\x1b[7m", 4);//反转颜色
int len = 0;
//画空格
while (len < E.screencols) {
abAppend(ab, " ", 1);
len++;
}
abAppend(ab, "\x1b[m", 3);//再反转回来
}
void editorRefreshScreen() {
editorScroll();
struct abuf ab = ABUF_INIT;
abAppend(&ab, "\x1b[?25l", 6);
abAppend(&ab, "\x1b[H", 3);
editorDrawRows(&ab);
editorDrawStatusBar(&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));
abAppend(&ab, "\x1b[?25h", 6);
write(STDOUT_FILENO, ab.b, ab.len);
abFree(&ab);
}
全局参数添加一个文件名
struct editorConfig {
int cx, cy;
int rx;
int rowoff;
int coloff;
int screenrows;
int screencols;
int numrows;
erow *row;
char *filename;//文件名
struct termios orig_termios;
};
void editorOpen(char *filename) {
free(E.filename);
E.filename = strdup(filename);
FILE *fp = fopen(filename, "r");
if (!fp) die("fopen");
char *line = NULL;
size_t linecap = 0;
ssize_t linelen;
while ((linelen = getline(&line, &linecap, fp)) != -1) {
while (linelen > 0 && (line[linelen - 1] == '\n' ||
line[linelen - 1] == '\r'))
linelen--;
editorAppendRow(line, linelen);
}
free(line);
fclose(fp);
}
void editorDrawStatusBar(struct abuf *ab) {
abAppend(ab, "\x1b[7m", 4);
char status[80], rstatus[80];
//文件名 总行数
int len = snprintf(status, sizeof(status), "%.20s - %d lines",
E.filename ? E.filename : "[No Name]", E.numrows);
//当前行/总行
int rlen = snprintf(rstatus, sizeof(rstatus), "%d/%d",
E.cy + 1, E.numrows);
if (len > E.screencols) len = E.screencols;
//先显示 文件名+总行
abAppend(ab, status, len);
while (len < E.screencols) {
//之后是空格，直到满足剩余字符长度="当前行/总行"的字符长度
if (E.screencols - len == rlen) {
//然后显示 当前行/总行
abAppend(ab, rstatus, rlen);
break;
} else {
abAppend(ab, " ", 1);
len++;
}
}
abAppend(ab, "\x1b[m", 3);
}
状态消息
包括时间和操作结果消息
#include #include 再空出一行来显示状态消息
void editorDrawStatusBar(struct abuf *ab) {
abAppend(ab, "\x1b[7m", 4);
char status[80], rstatus[80];
int len = snprintf(status, sizeof(status), "%.20s - %d lines",
E.filename ? E.filename : "[No Name]", E.numrows);
int rlen = snprintf(rstatus, sizeof(rstatus), "%d/%d",
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);
//空一行
abAppend(ab, "\r\n", 2);
}
void initEditor() {
E.cx = 0;
E.cy = 0;
E.rx = 0;
E.rowoff = 0;
E.coloff = 0;
E.numrows = 0;
E.row = NULL;
E.filename = NULL;
E.statusmsg[0] = '\0';
E.statusmsg_time = 0;
if (getWindowSize(&E.screenrows, &E.screencols) == -1) die("getWindowSize");
E.screenrows -= 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;
abAppend(&ab, "\x1b[?25l", 6);
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));
abAppend(&ab, "\x1b[?25h", 6);
write(STDOUT_FILENO, ab.b, ab.len);
abFree(&ab);
}