SowinskiBraeden/level-editor
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delete, enter key handling

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SowinskiBraeden committed 2022-09-06 22:36:03 -07:00
1 parent f543de9135
commit ad5cf0d4b7
2 files changed
+176 -6
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.gitignore
+3
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@@ -1,5 +1,8 @@
# Visual Studio Config
.vs/*
# Test file
test.txt
# Output
level
level.cpp
+173 -6
View File
@@ -8,6 +8,7 @@
#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdarg.h>
#include <stdlib.h>
@@ -22,10 +23,12 @@
#define LEVEL_VERSION "0.0.1"
#define LEVEL_TAB_STOP 8
#define LEVEL_QUIT_TIMES 3
#define CTRL_KEY(k) ((k) & 0x1f)
enum editorKey {
BACKSPACE = 127,
ARROW_LEFT = 1000,
ARROW_RIGHT,
ARROW_UP,
@@ -56,6 +59,7 @@ struct editorConfig {
int screencols;
int numrows;
erow *row;
int dirty;
char *filename;
char statusmsg[80];
time_t statusmsg_time;
@@ -64,6 +68,10 @@ struct editorConfig {
struct editorConfig E;
/*** prototypes ***/
void editorSetStatusMessage(const char* fmt, ...);
/*** terminal ***/
void die(const char *s) {
@@ -219,10 +227,12 @@ void editorUpdateRow(erow *row) {
row->rsize = idx;
}
void editorAppendRow(char *s, size_t len) {
void editorInsertRow(int at, const char *s, size_t len) {
if (at < 0 || at > E.numrows) return;
E.row = (erow*)realloc(E.row, sizeof(erow) * (E.numrows + 1));
memmove(&E.row[at + 1], &E.row[at], sizeof(erow) * (E.numrows - at));
int at = E.numrows;
E.row[at].size = len;
E.row[at].chars = (char*)malloc(len + 1);
memcpy(E.row[at].chars, s, len);
@@ -233,10 +243,108 @@ void editorAppendRow(char *s, size_t len) {
editorUpdateRow(&E.row[at]);
E.numrows++;
E.dirty++;
}
void editorFreeRow(erow* row) {
free(row->render);
free(row->chars);
}
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));
E.numrows--;
E.dirty++;
}
void editorRowInsertChar(erow* row, int at, int c) {
if (at < 0 || at > row->size) at = row->size;
row->chars = (char*)realloc(row->chars, row->size + 2);
memmove(&row->chars[at + 1], &row->chars[at], row->size - at + 1);
row->size++;
row->chars[at] = c;
editorUpdateRow(row);
E.dirty++;
}
void editorRowAppendString(erow* row, const char* s, size_t len) {
row->chars = (char*)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 {
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) {
int total_len = 0;
for (int j = 0; j < E.numrows; j++)
total_len += E.row[j].size + 1;
*buflen = total_len;
char *buf = (char*)malloc(total_len);
char *p = buf;
for (int 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);
@@ -251,11 +359,35 @@ E.filename = strdup(filename);
while (linelen > 0 && (line[linelen - 1] == '\n' ||
line[linelen - 1] == '\r'))
linelen--;
editorAppendRow(line, linelen);
editorInsertRow(E.numrows, line, linelen);
}
free(line);
fclose(fp);
E.dirty = 0;
}
void editorSave() {
if (E.filename == NULL) return;
int len;
char *buf = editorRowsToString(&len);
int fd = open(E.filename, O_RDWR | O_CREAT, 0644);
if (fd != -1) {
if (ftruncate(fd, len) != -1) {
if (write(fd, buf, len) == len) {
close(fd);
free(buf);
E.dirty = 0;
editorSetStatusMessage("Successfully Saved");
return;
}
}
close(fd);
}
free(buf);
editorSetStatusMessage("Can't save! I/O error: %s", strerror(errno));
}
/*** append buffer ***/
@@ -326,8 +458,9 @@ void editorDrawRows(struct abuf *ab) {
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 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), "%d/%d",
E.cy + 1, E.numrows);
if (len > E.screencols) len = E.screencols;
@@ -409,16 +542,32 @@ void editorMoveCursor(int key) {
}
void editorProcessKeypress() {
static int quit_times = LEVEL_QUIT_TIMES;
int c = editorReadKey();
switch (c) {
case '\r':
editorInsertNewLine();
break;
case CTRL_KEY('q'):
if (E.dirty && quit_times > 0) {
editorSetStatusMessage("WARNING! File has unsaved Changed. "
"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;
@@ -427,6 +576,13 @@ void editorProcessKeypress() {
if (E.cy < E.numrows) E.cx = E.row[E.cy].size;
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:
{
@@ -448,7 +604,17 @@ void editorProcessKeypress() {
case ARROW_RIGHT:
editorMoveCursor(c);
break;
case CTRL_KEY('l'):
case '\x1b':
break;
default:
editorInsertChar(c);
break;
}
quit_times = LEVEL_QUIT_TIMES;
}
/*** init ***/
@@ -461,6 +627,7 @@ void initEditor() {
E.coloff = 0;
E.numrows = 0;
E.row = NULL;
E.dirty = 0;
E.filename = NULL;
E.statusmsg[0] = '\0';
E.statusmsg_time = 0;
@@ -474,7 +641,7 @@ int main(int argc, char *argv[]) {
initEditor();
if (argc >= 2) editorOpen(argv[1]);
editorSetStatusMessage("HELP: Ctrl-Q = quit");
editorSetStatusMessage("HELP: Ctrl-S = save | Ctrl-Q = quit");
while (1) {
editorRefreshScreen();