diff --git a/level.cpp b/level.cpp index 5d2f326..1061b5f 100644 --- a/level.cpp +++ b/level.cpp @@ -6,14 +6,16 @@ #define _GNU_SOURCE #endif //_GNU_SOURCE -#include -#include -#include +#include +#include +#include +#include #include #include #include #include #include +#include #include /*** defines ***/ @@ -40,19 +42,23 @@ enum editorKey { // erow stands for "editor row" typedef struct erow { int size; - int resize; + int rsize; char *chars; char *render; } erow; struct editorConfig { int cx, cy; + int rx; int rowoff; int coloff; int screenrows; int screencols; int numrows; erow *row; + char *filename; + char statusmsg[80]; + time_t statusmsg_time; struct termios orig_termios; }; @@ -182,6 +188,15 @@ int getWindowSize(int *rows, int *cols) { /*** row operations ***/ +int editorRowCxToRx(erow *row, int cx) { + int rx = 0; + for (int j = 0; j < cx; j++) { + if (row->chars[j] == '\t') rx += (LEVEL_TAB_STOP - 1) - (rx % LEVEL_TAB_STOP); + rx++; + } + return rx; +} + void editorUpdateRow(erow *row) { int tabs = 0; for (int j = 0; j < row->size; j++) { @@ -189,13 +204,13 @@ void editorUpdateRow(erow *row) { } free(row->render); - row->render = malloc(row->size + tabs*(LEVEL_TAB_STOP - 1) + 1); + row->render = (char*)malloc(row->size + tabs*(LEVEL_TAB_STOP - 1) + 1); int idx = 0; for (int j = 0; j < row->size; j++) { if (row->chars[j] == '\t') { row->render[idx++] = ' '; - while (idx % LEVEL_TAB_STOP != 0) row->render(idx++) = ' '; + while (idx % LEVEL_TAB_STOP != 0) row->render[idx++] = ' '; } else { row->render[idx++] = row->chars[j]; } @@ -223,6 +238,9 @@ void editorAppendRow(char *s, size_t len) { /*** file i/o ***/ void editorOpen(char *filename) { + free(E.filename); +E.filename = strdup(filename); + FILE *fp = fopen(filename, "r"); if (!fp) die("fopen"); @@ -265,10 +283,13 @@ void abFree(struct abuf *ab) { /*** 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.cx < E.coloff) E.coloff = E.cx; - if (E.cx >= E.coloff + E.screencols) E.coloff = E.cx - E.screencols + 1; + if (E.cx < E.coloff) E.coloff = E.rx; + if (E.cx >= E.coloff + E.screencols) E.coloff = E.rx - E.screencols + 1; } void editorDrawRows(struct abuf *ab) { @@ -298,24 +319,55 @@ void editorDrawRows(struct abuf *ab) { } abAppend(ab, "\x1b[K", 3); - if (y < E.screenrows - 1) abAppend(ab, "\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", + 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); + int len = 0; + 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, "\x1[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[2J", 4); This line clears whole screen 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.cx - E.coloff) + 1); + (E.rx - E.coloff) + 1); abAppend(&ab, buf, strlen(buf)); abAppend(&ab, "\x1b[?25h", 6); @@ -324,6 +376,14 @@ void editorRefreshScreen() { 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 ***/ void editorMoveCursor(int key) { @@ -365,12 +425,18 @@ void editorProcessKeypress() { break; case END_KEY: - E.cx = E.screencols - 1; + 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); @@ -391,12 +457,17 @@ void editorProcessKeypress() { 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'; + E.statusmsg_time = 0; if (getWindowSize(&E.screenrows, &E.screencols) == -1) die("getWindowSize"); + E.screenrows -= 2; } int main(int argc, char *argv[]) { @@ -404,6 +475,8 @@ int main(int argc, char *argv[]) { initEditor(); if (argc >= 2) editorOpen(argv[1]); + editorSetStatusMessage("HELP: Ctrl-Q = quit"); + while (1) { editorRefreshScreen(); editorProcessKeypress();