tt

commit 83b7d018915e55e37a98cfc0d3fd8888c827d861
parent 7c46a4947b705412738793ef1cbf4e01d390f9d2
Author: Andrew Laack <andrew@laack.co>
Date:   Wed,  9 Sep 2026 21:18:05 -0500

run figlet to handle minutes

Diffstat:
A
.gitignore
 | 
1
+
M
README
 | 
4
++++
M
main.c
 | 
81
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++--

3 files changed, 84 insertions(+), 2 deletions(-)
diff --git a/.gitignore b/.gitignore
@@ -0,0 +1 @@
+tt
diff --git a/README b/README
@@ -2,6 +2,10 @@ tt - terminal timer
 ===================
 tt is a simple terminal timer program, written in C.
 
+depends
+=======
+figlet
+
 usage
 =====
 run:
diff --git a/main.c b/main.c
@@ -1,22 +1,99 @@
 #include <errno.h>
 #include <stdio.h>
 #include <stdlib.h>
+#include <unistd.h>
+#include <sys/select.h>
+#include <termios.h>
+#include <limits.h>
 
 #define USAGE_STRING "usage: tt {num_minutes}\n"
 #define INVALID_INPUT -1
 
+void clear_screen() {
+    printf("\033[2J\033[1;1H");
+    fflush(stdout);
+}
+
 int main(int argc, char** argv) {
+
+    fd_set readfds;
+    int nfds = 1;
+    int paused = 0;
+
+    FD_ZERO(&readfds);
+    FD_SET(0, &readfds);
+
     if (argc <= 1 || argc > 2) {
         printf(USAGE_STRING);
         return INVALID_INPUT;
     }
 
     char *end;
-    long value = strtol(argv[1], &end, 10); 
-    if (end == argv[1] || *end != '\0' || errno == ERANGE) {
+    errno = 0;
+
+    long value = strtol(argv[1], &end, 10);
+    if (end == argv[1] || *end != '\0' || errno == ERANGE || value <= 0) {
         printf("Invalid number: %s\n", argv[1]);
         return INVALID_INPUT;
     }
 
+    if (value > LONG_MAX / 60) {
+        printf("Number too large: %s\n", argv[1]);
+        return INVALID_INPUT;
+    }
+
+    value *= 60;
+
+    struct termios oldt, newt;
+    tcgetattr(0, &oldt);
+    newt = oldt;
+    newt.c_lflag &= ~(ICANON | ECHO);
+    tcsetattr(0, TCSANOW, &newt);
+
+    clear_screen();
+
+    while (value > 0) {
+        long minutes = value / 60;
+        long seconds = value % 60;
+
+        char timeStr[16];
+        snprintf(timeStr, sizeof(timeStr), "%02ld:%02ld", minutes, seconds);
+
+        char commandToRun[100];
+        snprintf(commandToRun, sizeof(commandToRun), "figlet %s", timeStr);
+        system(commandToRun);
+
+        while (1) {
+            struct timeval timeout;
+            timeout.tv_sec = paused ? 0 : 1;
+            timeout.tv_usec = 0;
+
+            FD_ZERO(&readfds);
+            FD_SET(0, &readfds);
+
+            select(nfds, &readfds, NULL, NULL, &timeout);
+
+            if (FD_ISSET(0, &readfds)) {
+                char c;
+                read(0, &c, 1);
+
+                if (c == ' ') {
+                    paused = !paused;
+                }
+            }
+
+            if (!paused) {
+                value -= 1;
+                break;
+            }
+        }
+
+        if (value > 0) {
+            clear_screen();
+        }
+    }
+
+    tcsetattr(0, TCSANOW, &oldt);
+
     return 0;
 }