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-rw-r--r--src/analyze/analyze-calendar.c140
1 files changed, 140 insertions, 0 deletions
diff --git a/src/analyze/analyze-calendar.c b/src/analyze/analyze-calendar.c
new file mode 100644
index 0000000..6daab08
--- /dev/null
+++ b/src/analyze/analyze-calendar.c
@@ -0,0 +1,140 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include "analyze.h"
+#include "analyze-calendar.h"
+#include "calendarspec.h"
+#include "format-table.h"
+#include "terminal-util.h"
+
+static int test_calendar_one(usec_t n, const char *p) {
+ _cleanup_(calendar_spec_freep) CalendarSpec *spec = NULL;
+ _cleanup_(table_unrefp) Table *table = NULL;
+ _cleanup_free_ char *t = NULL;
+ TableCell *cell;
+ int r;
+
+ r = calendar_spec_from_string(p, &spec);
+ if (r < 0) {
+ log_error_errno(r, "Failed to parse calendar specification '%s': %m", p);
+ time_parsing_hint(p, /* calendar= */ false, /* timestamp= */ true, /* timespan= */ true);
+ return r;
+ }
+
+ r = calendar_spec_to_string(spec, &t);
+ if (r < 0)
+ return log_error_errno(r, "Failed to format calendar specification '%s': %m", p);
+
+ table = table_new_vertical();
+ if (!table)
+ return log_oom();
+
+ assert_se(cell = table_get_cell(table, 0, 0));
+ r = table_set_ellipsize_percent(table, cell, 100);
+ if (r < 0)
+ return r;
+
+ assert_se(cell = table_get_cell(table, 0, 1));
+ r = table_set_ellipsize_percent(table, cell, 100);
+ if (r < 0)
+ return r;
+
+ if (!streq(t, p)) {
+ r = table_add_many(table,
+ TABLE_FIELD, "Original form",
+ TABLE_STRING, p);
+ if (r < 0)
+ return table_log_add_error(r);
+ }
+
+ r = table_add_many(table,
+ TABLE_FIELD, "Normalized form",
+ TABLE_STRING, t);
+ if (r < 0)
+ return table_log_add_error(r);
+
+ for (unsigned i = 0; i < arg_iterations; i++) {
+ usec_t next;
+
+ r = calendar_spec_next_usec(spec, n, &next);
+ if (r == -ENOENT) {
+ if (i == 0) {
+ r = table_add_many(table,
+ TABLE_FIELD, "Next elapse",
+ TABLE_STRING, "never",
+ TABLE_SET_COLOR, ansi_highlight_yellow());
+ if (r < 0)
+ return table_log_add_error(r);
+ }
+ break;
+ }
+ if (r < 0)
+ return log_error_errno(r, "Failed to determine next elapse for '%s': %m", p);
+
+ if (i == 0) {
+ r = table_add_many(table,
+ TABLE_FIELD, "Next elapse",
+ TABLE_TIMESTAMP, next,
+ TABLE_SET_COLOR, ansi_highlight_blue());
+ if (r < 0)
+ return table_log_add_error(r);
+ } else {
+ int k = DECIMAL_STR_WIDTH(i + 1);
+
+ if (k < 8)
+ k = 8 - k;
+ else
+ k = 0;
+
+ r = table_add_cell_stringf_full(table, NULL, TABLE_FIELD, "Iteration #%u", i+1);
+ if (r < 0)
+ return table_log_add_error(r);
+
+ r = table_add_many(table,
+ TABLE_TIMESTAMP, next,
+ TABLE_SET_COLOR, ansi_highlight_blue());
+ if (r < 0)
+ return table_log_add_error(r);
+ }
+
+ if (!in_utc_timezone()) {
+ r = table_add_many(table,
+ TABLE_FIELD, "(in UTC)",
+ TABLE_TIMESTAMP_UTC, next);
+ if (r < 0)
+ return table_log_add_error(r);
+ }
+
+ r = table_add_many(table,
+ TABLE_FIELD, "From now",
+ TABLE_TIMESTAMP_RELATIVE, next);
+ if (r < 0)
+ return table_log_add_error(r);
+
+ n = next;
+ }
+
+ return table_print(table, NULL);
+}
+
+int verb_calendar(int argc, char *argv[], void *userdata) {
+ int r = 0;
+ usec_t n;
+
+ if (arg_base_time != USEC_INFINITY)
+ n = arg_base_time;
+ else
+ n = now(CLOCK_REALTIME); /* We want to use the same "base" for all expressions */
+
+ STRV_FOREACH(p, strv_skip(argv, 1)) {
+ int k;
+
+ k = test_calendar_one(n, *p);
+ if (r == 0 && k < 0)
+ r = k;
+
+ if (p[1])
+ putchar('\n');
+ }
+
+ return r;
+}