Open files, and scroll through them

This commit is contained in:
Timothy Warren 2019-08-19 13:23:54 -04:00
parent 727baa5069
commit 36059938f6

96
kilo.c
View File

@ -1,10 +1,16 @@
/*** includes ***/ /*** includes ***/
#define _DEFAULT_SOURCE
#define _BSD_SOURCE
#define _GNU_SOURCE
#include <ctype.h> #include <ctype.h>
#include <errno.h> #include <errno.h>
#include <stdio.h> #include <stdio.h>
#include <stdlib.h> #include <stdlib.h>
#include <string.h> #include <string.h>
#include <sys/ioctl.h> #include <sys/ioctl.h>
#include <sys/types.h>
#include <termios.h> #include <termios.h>
#include <unistd.h> #include <unistd.h>
@ -28,10 +34,18 @@ enum editorKey {
/*** data ***/ /*** data ***/
typedef struct erow {
int size;
char *chars;
} erow;
struct editorConfig { struct editorConfig {
int cx, cy; int cx, cy;
int rowoff;
int screenrows; int screenrows;
int screencols; int screencols;
int numrows;
erow *row;
struct termios orig_termios; struct termios orig_termios;
}; };
@ -216,6 +230,46 @@ int getWindowSize(int *rows, int *cols)
return 0; return 0;
} }
/*** row operations ***/
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++;
}
/*** file i/o ***/
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);
}
/*** append buffer ***/ /*** append buffer ***/
struct abuf { struct abuf {
@ -246,12 +300,28 @@ void abFree(struct abuf *ab)
/*** output ***/ /*** output ***/
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 editorDrawRows(struct abuf *ab) void editorDrawRows(struct abuf *ab)
{ {
int y; int y;
for (y = 0; y < E.screenrows; y++) for (y = 0; y < E.screenrows; y++)
{ {
if (y == E.screenrows / 3) int filerow = y + E.rowoff;
if (filerow >= E.numrows)
{
if (E.numrows == 0 && y == E.screenrows / 3)
{ {
char welcome[80]; char welcome[80];
int welcomelen = snprintf(welcome, sizeof(welcome), int welcomelen = snprintf(welcome, sizeof(welcome),
@ -280,6 +350,17 @@ void editorDrawRows(struct abuf *ab)
{ {
abAppend(ab, "~", 1); abAppend(ab, "~", 1);
} }
}
else
{
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); abAppend(ab, "\x1b[K", 3);
if (y < E.screenrows - 1) if (y < E.screenrows - 1)
@ -291,6 +372,8 @@ void editorDrawRows(struct abuf *ab)
void editorRefreshScreen() void editorRefreshScreen()
{ {
editorScroll();
struct abuf ab = ABUF_INIT; struct abuf ab = ABUF_INIT;
abAppend(&ab, "\x1b[?25l", 6); abAppend(&ab, "\x1b[?25l", 6);
@ -336,7 +419,7 @@ void editorMoveCursor(int key)
break; break;
case ARROW_DOWN: case ARROW_DOWN:
if (E.cy != E.screenrows - 1) if (E.cy < E.numrows)
{ {
E.cy++; E.cy++;
} }
@ -389,6 +472,9 @@ void initEditor()
{ {
E.cx = 0; E.cx = 0;
E.cy = 0; E.cy = 0;
E.rowoff = 0;
E.numrows = 0;
E.row = NULL;
if (getWindowSize(&E.screenrows, &E.screencols) == -1) if (getWindowSize(&E.screenrows, &E.screencols) == -1)
{ {
@ -396,10 +482,14 @@ void initEditor()
} }
} }
int main() int main(int argc, char *argv[])
{ {
enableRawMode(); enableRawMode();
initEditor(); initEditor();
if (argc >= 2)
{
editorOpen(argv[1]);
}
while (1) while (1)
{ {