From 533fd864a564943beba3b0d311eb7e0f990051e2 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?John=20Ankarstr=C3=B6m?= <john@ankarstrom.se>
Date: Sat, 12 Dec 2020 20:33:55 +0100
Subject: typ.c: Add backspace support (draft)

---
 typ.c | 51 +++++++++++++++++++++++++++++++++++++++++----------
 1 file changed, 41 insertions(+), 10 deletions(-)

diff --git a/typ.c b/typ.c
index 542476d..8c6d808 100644
--- a/typ.c
+++ b/typ.c
@@ -23,41 +23,72 @@ int main() {
 	wt = malloc(ws * sizeof(double)); /* word times */
 	if (wt == NULL) err(1, "malloc");
 
+	for (int i = 0; i < ws; i++)
+		wt[i] = 0;
+
 	l = 0; /* current word length */
-	wi = 0; /* number of current word in order */
+	wi = -1; /* index of current word in order */
 
 	/* enter "raw" mode */
 	ttyfd = open("/dev/tty", O_RDWR);
 	if (ttyfd == -1) err(1, "open");
 	tcgetattr(ttyfd, &orig);
 	raw = orig;
-	raw.c_lflag &= ~(ICANON);
+	raw.c_lflag &= ~(ECHO | ICANON);
 	tcsetattr(ttyfd, TCSANOW, &raw);
 
 	/* read loop */
-	while ((c = getchar()) != EOF) {
-		if (l == 0)
-			t = atime(); /* current word time */
+	while (read(ttyfd, &c, 1)) {
+		/* backspace */
+		if (c == 127) {
+			l--;
+			write(ttyfd, &c, 1);
+			if (l == -1) {
+				wi--;
+				fprintf(stderr, "<\n");
+			}
+			continue;
+		}
+
+		/* back to previous word (after backspace) */
+		if (l == -1) {
+			l = wl[wi];
+			fprintf(stderr, "%d\n", wl[wi-1]);
+		}
+
+		/* new word */
+		if (c != ' ' && c != '\n' && (l == 0 || l == -1)) {
+			wi++;
+			t = atime(); /* current word start time */
+			fprintf(stderr, "*\n");
+		}
+
+		/* end word */
 		if (c == ' ' || c == '\n') {
 			wl[wi] = l;
-			wt[wi] = atime() - t;
+			if (t > -1) {
+				wt[wi] += atime() - t;
+				// fprintf(stderr, "[+%f]", atime() - t);
+			}
 			l = 0;
-			wi++;
+			t = -1;
 		} else
 			l++;
 		if (c == '\n')
 			break;
+		write(ttyfd, &c, 1);
 	}
+	write(ttyfd, "\n", 1);
 
 	/* print statistics */
 	double tt = 0;
 	int tl = 0;
-	for (int i = 0; i < wi; i++) {
+	for (int i = 0; i <= wi; i++) {
 		tt += wt[i];
 		tl += wl[i];
 	}
-	printf("%f seconds per word\n", tt / wi);
-	printf("%f seconds per word character\n", tt / tl);
+	printf("%f seconds per word (%d)\n", tt / (wi + 1), wi + 1);
+	printf("%f seconds per word character (%d)\n", tt / tl, tl);
 
 	/* restore original terminal settings */
 	tcsetattr(ttyfd, TCSANOW, &orig);
-- 
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