From ddbc8d6346f383da636bea540163868cda5f786a Mon Sep 17 00:00:00 2001
From: Tyrel Souza <923113+tyrelsouza@users.noreply.github.com>
Date: Thu, 21 Oct 2021 01:13:33 -0400
Subject: [PATCH] statusbars

---
 README.md |  2 ++
 tted.c    | 81 +++++++++++++++++++++++++++++++++++++++++++++++++------
 2 files changed, 75 insertions(+), 8 deletions(-)

diff --git a/README.md b/README.md
index f994af7..cb62a4d 100644
--- a/README.md
+++ b/README.md
@@ -5,3 +5,5 @@ https://viewsourcecode.org/snaptoken/kilo/04.aTextViewer.html#vertical-scrolling
 https://viewsourcecode.org/snaptoken/kilo/04.aTextViewer.html#horizontal-scrolling
 https://viewsourcecode.org/snaptoken/kilo/04.aTextViewer.html#tabs-and-the-cursor
 https://viewsourcecode.org/snaptoken/kilo/04.aTextViewer.html#scrolling-with-page-up-and-page-down
+
+https://viewsourcecode.org/snaptoken/kilo/05.aTextEditor.html
diff --git a/tted.c b/tted.c
index c2380e2..79c4946 100644
--- a/tted.c
+++ b/tted.c
@@ -6,11 +6,13 @@
 #include <ctype.h>
 #include <errno.h>
 #include <stdio.h>
+#include <stdarg.h>
 #include <stdlib.h>
 #include <string.h>
 #include <sys/ioctl.h>
 #include <sys/types.h>
 #include <termios.h>
+#include <time.h>
 #include <unistd.h>
 
 /** defines */
@@ -48,6 +50,9 @@ struct editorConfig {
     int screencols;
     int numrows;
     erow *row;
+    char *filename;
+    char statusmsg[80];
+    time_t statusmsg_time;
     struct termios orig_termios;
 };
 struct editorConfig E;
@@ -176,14 +181,15 @@ int getWindowSize(int *rows, int *cols) {
 int editorRowCxToRx(erow *row, int cx) {
     int rx = 0;
     int j;
-    for (j=0; j < cx; j++){
+    for (j = 0; j < cx; j++) {
         if (row->chars[j] == '\t') {
-            rx += (TTED_TAB_STOP -1) - (rx % TTED_TAB_STOP);
+            rx += (TTED_TAB_STOP - 1) - (rx % TTED_TAB_STOP);
         }
         rx++;
     }
     return rx;
 }
+
 void editorUpdateRow(erow *row) {
     int tabs = 0;
     int j;
@@ -194,7 +200,7 @@ void editorUpdateRow(erow *row) {
     }
 
     free(row->render);
-    row->render = malloc(row->size + tabs*(TTED_TAB_STOP - 1) + 1);
+    row->render = malloc(row->size + tabs * (TTED_TAB_STOP - 1) + 1);
 
     int idx = 0;
     for (j = 0; j < row->size; j++) {
@@ -226,6 +232,8 @@ 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");
 
@@ -267,7 +275,7 @@ void abFree(struct abuf *ab) {
 /** output */
 void editorScroll() {
     E.rx = 0;
-    if (E.cy < E.numrows){
+    if (E.cy < E.numrows) {
         E.rx = editorRowCxToRx(&E.row[E.cy], E.cx);
     }
 
@@ -314,12 +322,42 @@ 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);
+    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();
 
@@ -327,6 +365,8 @@ void editorRefreshScreen() {
     abAppend(&ab, "\x1b[?25l", 6);
     abAppend(&ab, "\x1b[H", 3); // Cursor Position home
     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);
@@ -337,6 +377,14 @@ 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) {
@@ -393,11 +441,21 @@ 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);
@@ -421,7 +479,12 @@ void initEditor() {
     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;
 }
 
 int main(int argc, char *argv[]) {
@@ -431,6 +494,8 @@ int main(int argc, char *argv[]) {
         editorOpen(argv[1]);
     }
 
+    editorSetStatusMessage("HELP: Ctrl-Q = quit");
+
     while (1) {
         editorRefreshScreen();
         editorProcessKeypress();