ui-stats: replace 'enable-stats' setting with 'max-stats'

The new 'max-stats' and 'repo.max-stats' settings makes it possible to
define the maximum statistics period, both globally and per repo. Hence,
it is now feasible to allow statistics on repositories with a high commit
frequency, like linux-2.6, by setting repo.max-stats to e.g. 'month'.

Signed-off-by: Lars Hjemli <hjemli@gmail.com>

1 files changed, 58 insertions, 39 deletions

diff --git a/ui-stats.c b/ui-stats.c
index 3cc8d70..1104485 100644
--- a/ui-stats.c
+++ b/ui-stats.c
@@ -1,27 +1,13 @@
+#include <string-list.h>
+
 #include "cgit.h"
 #include "html.h"
-#include <string-list.h>
+#include "ui-shared.h"
+#include "ui-stats.h"
 
 #define MONTHS 6
 
-struct Period {
-        const char code;
-        const char *name;
-        int max_periods;
-        int count;
-
-        /* Convert a tm value to the first day in the period */
-        void (*trunc)(struct tm *tm);
-
-        /* Update tm value to start of next/previous period */
-        void (*dec)(struct tm *tm);
-        void (*inc)(struct tm *tm);
-
-        /* Pretty-print a tm value */
-        char *(*pretty)(struct tm *tm);
-};
-
 struct authorstat {
         long total;
         struct string_list list;
 };
@@ -136,17 +122,41 @@ static char *pretty_year(struct tm *tm)
 {
         return fmt("%d", tm->tm_year + 1900);
 }
 
-struct Period periods[] = {
+struct cgit_period periods[] = {
         {'w', "week", 12, 4, trunc_week, dec_week, inc_week, pretty_week},
         {'m', "month", 12, 4, trunc_month, dec_month, inc_month, pretty_month},
         {'q', "quarter", 12, 4, trunc_quarter, dec_quarter, inc_quarter, pretty_quarter},
         {'y', "year", 12, 4, trunc_year, dec_year, inc_year, pretty_year},
 };
 
+/* Given a period code or name, return a period index (1, 2, 3 or 4)
+ * and update the period pointer to the correcsponding struct.
+ * If no matching code is found, return 0.
+ */
+int cgit_find_stats_period(const char *expr, struct cgit_period **period)
+{
+        int i;
+        char code = '\0';
+
+        if (!expr)
+                return 0;
+
+        if (strlen(expr) == 1)
+                code = expr[0];
+
+        for (i = 0; i < sizeof(periods) / sizeof(periods[0]); i++)
+                if (periods[i].code == code || !strcmp(periods[i].name, expr)) {
+                        if (period)
+                                *period = &periods[i];
+                        return i+1;
+                }
+        return 0;
+}
+
 static void add_commit(struct string_list *authors, struct commit *commit,
-        struct Period *period)
+        struct cgit_period *period)
 {
         struct commitinfo *info;
         struct string_list_item *author, *item;
         struct authorstat *authorstat;
@@ -189,9 +199,9 @@ static int cmp_total_commits(const void *a1, const void *a2)
 /* Walk the commit DAG and collect number of commits per author per
  * timeperiod into a nested string_list collection.
  */
 struct string_list collect_stats(struct cgit_context *ctx,
-        struct Period *period)
+        struct cgit_period *period)
 {
         struct string_list authors;
         struct rev_info rev;
         struct commit *commit;
@@ -232,9 +242,9 @@ struct string_list collect_stats(struct cgit_context *ctx,
 }
 
 void print_combined_authorrow(struct string_list *authors, int from, int to,
         const char *name, const char *leftclass, const char *centerclass,
-        const char *rightclass, struct Period *period)
+        const char *rightclass, struct cgit_period *period)
 {
         struct string_list_item *author;
         struct authorstat *authorstat;
         struct string_list *items;
@@ -270,9 +280,10 @@ void print_combined_authorrow(struct string_list *authors, int from, int to,
         }
         htmlf("<td class='%s'>%d</td></tr>", rightclass, total);
 }
 
-void print_authors(struct string_list *authors, int top, struct Period *period)
+void print_authors(struct string_list *authors, int top,
+                   struct cgit_period *period)
 {
         struct string_list_item *author;
         struct authorstat *authorstat;
         struct string_list *items;
@@ -338,18 +349,24 @@ void print_authors(struct string_list *authors, int top, struct Period *period)
  */
 void cgit_show_stats(struct cgit_context *ctx)
 {
         struct string_list authors;
-        struct Period *period;
+        struct cgit_period *period;
         int top, i;
+        const char *code = "w";
 
-        period = &periods[0];
-        if (ctx->qry.period) {
-                for (i = 0; i < sizeof(periods) / sizeof(periods[0]); i++)
-                        if (periods[i].code == ctx->qry.period[0]) {
-                                period = &periods[i];
-                                break;
-                        }
+        if (ctx->qry.period)
+                code = ctx->qry.period;
+
+        i = cgit_find_stats_period(code, &period);
+        if (!i) {
+                cgit_print_error(fmt("Unknown statistics type: %c", code));
+                return;
+        }
+        if (i > ctx->repo->max_stats) {
+                cgit_print_error(fmt("Statistics type disabled: %s",
+                                     period->name));
+                return;
         }
         authors = collect_stats(ctx, period);
         qsort(authors.items, authors.nr, sizeof(struct string_list_item),
                 cmp_total_commits);
@@ -367,16 +384,18 @@ void cgit_show_stats(struct cgit_context *ctx)
 
         html("<form method='get' action='.' style='float: right; text-align: right;'>");
         if (strcmp(ctx->qry.head, ctx->repo->defbranch))
                 htmlf("<input type='hidden' name='h' value='%s'/>", ctx->qry.head);
-        html("Period: ");
-        html("<select name='period' onchange='this.form.submit();'>");
-        for (i = 0; i < sizeof(periods) / sizeof(periods[0]); i++)
-                htmlf("<option value='%c'%s>%s</option>",
-                        periods[i].code,
-                        period == &periods[i] ? " selected" : "",
-                        periods[i].name);
-        html("</select><br/><br/>");
+        if (ctx->repo->max_stats > 1) {
+                html("Period: ");
+                html("<select name='period' onchange='this.form.submit();'>");
+                for (i = 0; i < ctx->repo->max_stats; i++)
+                        htmlf("<option value='%c'%s>%s</option>",
+                                periods[i].code,
+                                period == &periods[i] ? " selected" : "",
+                                periods[i].name);
+                html("</select><br/><br/>");
+        }
         html("Authors: ");
         html("");
         html("<select name='ofs' onchange='this.form.submit();'>");
         htmlf("<option value='10'%s>10</option>", top == 10 ? " selected" : "");