From 311c481bfe0b22516859584bf79fb95716927e99 Mon Sep 17 00:00:00 2001
From: Zhong Jianxin <azuwis@gmail.com>
Date: Sun, 1 Sep 2024 21:21:26 +0800
Subject: [PATCH] tag: add '/N' formatter

---
 doc/yambar-tags.5.scd |  4 ++++
 tag.c                 | 16 ++++++++++++----
 2 files changed, 16 insertions(+), 4 deletions(-)

diff --git a/doc/yambar-tags.5.scd b/doc/yambar-tags.5.scd
index adda208..f58678c 100644
--- a/doc/yambar-tags.5.scd
+++ b/doc/yambar-tags.5.scd
@@ -86,6 +86,10 @@ be used.
 :  format
 :  Range tags
 :  Renders a range tag's value as a percentage value
+|  /N
+:  format
+:  All tag types
+:  Renders a tag's value (in decimal) divided by N
 |  b
 :  format
 :  All tag types
diff --git a/tag.c b/tag.c
index ce4e0e8..48155b5 100644
--- a/tag.c
+++ b/tag.c
@@ -430,12 +430,12 @@ sbuf_append(struct sbuf *s1, const char *s2)
 
 // stores the number in "*value" on success
 static bool
-is_number(const char *str, int *value)
+is_number(const char *str, long *value)
 {
     errno = 0;
 
     char *end;
-    int v = strtol(str, &end, 10);
+    long v = strtol(str, &end, 10);
     if (errno != 0 || *end != '\0')
         return false;
 
@@ -522,8 +522,8 @@ tags_expand_template(const char *template, const struct tag_set *tags)
         } kind
             = VALUE_VALUE;
 
-        int digits = 0;
-        int decimals = 2;
+        long digits = 0;
+        long decimals = 2;
         long divider = 1;
         bool zero_pad = false;
         char *point = NULL;
@@ -537,6 +537,14 @@ tags_expand_template(const char *template, const struct tag_set *tags)
                 format = FMT_OCT;
             else if (strcmp(tag_args[i], "%") == 0)
                 format = FMT_PERCENT;
+            else if (*tag_args[i] == '/') {
+                format = FMT_DIVIDE;
+                const char *divider_str = tag_args[i] + 1;
+                if (!is_number(divider_str, &divider) || divider == 0) {
+                    divider = 1;
+                    LOG_WARN("tag `%s`: invalid divider %s, reset to 1", tag_name, divider_str);
+                }
+            }
             else if (strcmp(tag_args[i], "b") == 0) {
                 format = FMT_DIVIDE;
                 divider = 8;