progressbar.c

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#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <unistd.h>
#include <string.h>

_PROTOTYPE(int main, (int argc, char **argv));

void
prettyprogress(long b, long maxb, time_t starttime)
{
  /* print progress indication */
  time_t spent, now;
  double bpsec;
  time(&now);
  spent = now - starttime;
  printf("\r"); /* Make sure progress bar starts at beginning of line */
  if(spent > 0 && (bpsec = (double)b / spent) > 0) {
        int len, i;
        long secremain, minremain, hremain;
          secremain = (maxb - b) / bpsec;
          minremain = (secremain / 60) % 60;
          hremain = secremain / 3600;
        len = printf("Remaining: %ld files. ", maxb-b);

#if 0
        len += printf("ETA: %d:%02d:%02d ",
                hremain, minremain, secremain % 60);
#endif

        len += printf(" [");

#define WIDTH 77
        len = WIDTH - len;
        for(i = 0; i < (b * (len-1) / maxb); i++) 
                printf("=");
        printf("|");
        for(; i < len-2; i++) 
                printf("-");
        printf("]\n");
  } else printf("\n");

  return;
}

int main(argc, argv)
int argc;
char *argv[];
{
        long i = 0, count = 0;
        int l;
        char line[2000];
        time_t start;
        if(argc < 2) return 1;
        count = atol(argv[1]);
        if(count < 0) return 1;
        time(&start);
        printf("\n");
#define LINES 5
        for(l = 1; l <= LINES+1; l++) printf("\n");
        printf("");
        while(fgets(line, sizeof(line), stdin)) {
                char *nl;
                i++;
                for(l = 0; l <= LINES; l++)  printf("");
                if(i <= count) prettyprogress(i, count, start);
                else printf("\n");
                printf("");
                for(l = 0; l < LINES; l++)  printf("");
                if((nl = strchr(line, '\n'))) *nl = '\0';
                line[78] = '\0';
                printf("\r%s\r", line);
        }

        printf("\nDone.\n");

        return 0;
}

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