Andrew's git - gitweb.git/blob

   1#include "git-compat-util.h"
   2#include "progress.h"
   3
   4struct progress {
   5        const char *title;
   6        int last_value;
   7        unsigned total;
   8        unsigned last_percent;
   9        unsigned delay;
  10        unsigned delayed_percent_treshold;
  11};
  12
  13static volatile sig_atomic_t progress_update;
  14
  15static void progress_interval(int signum)
  16{
  17        progress_update = 1;
  18}
  19
  20static void set_progress_signal(void)
  21{
  22        struct sigaction sa;
  23        struct itimerval v;
  24
  25        progress_update = 0;
  26
  27        memset(&sa, 0, sizeof(sa));
  28        sa.sa_handler = progress_interval;
  29        sigemptyset(&sa.sa_mask);
  30        sa.sa_flags = SA_RESTART;
  31        sigaction(SIGALRM, &sa, NULL);
  32
  33        v.it_interval.tv_sec = 1;
  34        v.it_interval.tv_usec = 0;
  35        v.it_value = v.it_interval;
  36        setitimer(ITIMER_REAL, &v, NULL);
  37}
  38
  39static void clear_progress_signal(void)
  40{
  41        struct itimerval v = {{0,},};
  42        setitimer(ITIMER_REAL, &v, NULL);
  43        signal(SIGALRM, SIG_IGN);
  44        progress_update = 0;
  45}
  46
  47static int display(struct progress *progress, unsigned n, int done)
  48{
  49        char *eol;
  50
  51        if (progress->delay) {
  52                if (!progress_update || --progress->delay)
  53                        return 0;
  54                if (progress->total) {
  55                        unsigned percent = n * 100 / progress->total;
  56                        if (percent > progress->delayed_percent_treshold) {
  57                                /* inhibit this progress report entirely */
  58                                clear_progress_signal();
  59                                progress->delay = -1;
  60                                progress->total = 0;
  61                                return 0;
  62                        }
  63                }
  64        }
  65
  66        progress->last_value = n;
  67        eol = done ? ", done.   \n" : "   \r";
  68        if (progress->total) {
  69                unsigned percent = n * 100 / progress->total;
  70                if (percent != progress->last_percent || progress_update) {
  71                        progress->last_percent = percent;
  72                        fprintf(stderr, "%s: %3u%% (%u/%u)%s", progress->title,
  73                                percent, n, progress->total, eol);
  74                        progress_update = 0;
  75                        return 1;
  76                }
  77        } else if (progress_update) {
  78                fprintf(stderr, "%s: %u%s", progress->title, n, eol);
  79                progress_update = 0;
  80                return 1;
  81        }
  82
  83        return 0;
  84}
  85
  86int display_progress(struct progress *progress, unsigned n)
  87{
  88        return progress ? display(progress, n, 0) : 0;
  89}
  90
  91struct progress *start_progress_delay(const char *title, unsigned total,
  92                                       unsigned percent_treshold, unsigned delay)
  93{
  94        struct progress *progress = malloc(sizeof(*progress));
  95        if (!progress) {
  96                /* unlikely, but here's a good fallback */
  97                fprintf(stderr, "%s...\n", title);
  98                return NULL;
  99        }
 100        progress->title = title;
 101        progress->total = total;
 102        progress->last_value = -1;
 103        progress->last_percent = -1;
 104        progress->delayed_percent_treshold = percent_treshold;
 105        progress->delay = delay;
 106        set_progress_signal();
 107        return progress;
 108}
 109
 110struct progress *start_progress(const char *title, unsigned total)
 111{
 112        return start_progress_delay(title, total, 0, 0);
 113}
 114
 115void stop_progress(struct progress **p_progress)
 116{
 117        struct progress *progress = *p_progress;
 118        if (!progress)
 119                return;
 120        *p_progress = NULL;
 121        if (progress->last_value != -1) {
 122                /* Force the last update */
 123                progress_update = 1;
 124                display(progress, progress->last_value, 1);
 125        }
 126        clear_progress_signal();
 127        free(progress);
 128}