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tag: add a ‘%’ formatter

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Range tags can now be rendered as a percentage value, by using a ‘%’
formatter:

  {tag_name:%}
This commit is contained in:
Daniel Eklöf 2021-08-27 21:02:01 +02:00
parent 0da24198b3
commit e201cc3d30
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GPG key ID: 5BBD4992C116573F
3 changed files with 73 additions and 7 deletions
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28
tag.c
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@ -459,7 +459,7 @@ tags_expand_template(const char *template, const struct tag_set *tags)
sbuf_append_at_most(&formatted, template, begin - template);
/* Parse arguments */
enum { FMT_DEFAULT, FMT_HEX, FMT_OCT } format = FMT_DEFAULT;
enum { FMT_DEFAULT, FMT_HEX, FMT_OCT, FMT_PERCENT } format = FMT_DEFAULT;
enum { VALUE_VALUE, VALUE_MIN, VALUE_MAX, VALUE_UNIT } kind = VALUE_VALUE;
for (size_t i = 0; i < MAX_TAG_ARGS; i++) {
@ -469,12 +469,16 @@ tags_expand_template(const char *template, const struct tag_set *tags)
format = FMT_HEX;
else if (strcmp(tag_args[i], "oct") == 0)
format = FMT_OCT;
else if (strcmp(tag_args[i], "%") == 0)
format = FMT_PERCENT;
else if (strcmp(tag_args[i], "min") == 0)
kind = VALUE_MIN;
else if (strcmp(tag_args[i], "max") == 0)
kind = VALUE_MAX;
else if (strcmp(tag_args[i], "unit") == 0)
kind = VALUE_UNIT;
else
LOG_WARN("invalid tag formatter: %s", tag_args[i]);
}
/* Copy tag value */
@ -493,20 +497,40 @@ tags_expand_template(const char *template, const struct tag_set *tags)
sbuf_append(&formatted, str);
break;
}
case FMT_PERCENT: {
const long min = tag->min(tag);
const long max = tag->max(tag);
const long cur = tag->as_int(tag);
char str[4];
snprintf(str, sizeof(str), "%lu", (cur - min) * 100 / (max - min));
sbuf_append(&formatted, str);
break;
}
}
break;
case VALUE_MIN:
case VALUE_MAX: {
const long value = kind == VALUE_MIN ? tag->min(tag) : tag->max(tag);
const long min = tag->min(tag);
const long max = tag->max(tag);
long value = kind == VALUE_MIN ? min : max;
const char *fmt;
switch (format) {
case FMT_DEFAULT: fmt = "%ld"; break;
case FMT_HEX: fmt = "%lx"; break;
case FMT_OCT: fmt = "%lo"; break;
case FMT_PERCENT:
value = (value - min) * 100 / (max - min);
fmt = "%lu";
break;
}
char str[24];
snprintf(str, sizeof(str), fmt, value);
sbuf_append(&formatted, str);