From c560f0f02ddf51a3ce38a945b48ecf49a138e38d Mon Sep 17 00:00:00 2001
From: Tomasz Kramkowski <tk@the-tk.com>
Date: Wed, 30 Dec 2020 22:27:33 +0000
Subject: Simpler and more flexible interval handling

---
 README.md | 15 ++++-----------
 conf      |  8 +++++++-
 run       |  6 +-----
 3 files changed, 12 insertions(+), 17 deletions(-)

diff --git a/README.md b/README.md
index d6a49e1..6acba52 100644
--- a/README.md
+++ b/README.md
@@ -2,9 +2,9 @@
 
 A simple battery daemon written for use with a daemontools-style supervisor.
 
-`run` polls the status of a `check` function with a regular interval. On the
-transition from a successful `check` exit status to an unsuccessful `check` exit
-status the `failed` function is called.
+`run` polls the status of a `check` function with an interleaved call to
+`interval`. On the transition from a successful `check` exit status to an
+unsuccessful `check` exit status the `failed` function is called.
 
 ## Installation
 
@@ -20,7 +20,7 @@ Adjust the above as needed.
 Configure `conf` appropriately. This should contain three functions:
 
 `interval`
-:   Called to determine the polling interval (see below).
+:   Called between consecutive calls to `check`.
 
 `check`
 :   Called to determine the battery status.
@@ -29,10 +29,3 @@ Configure `conf` appropriately. This should contain three functions:
 :   Called when the battery status has transitioned from a successful to a
     failing return.
 
-Optionally two variables can be set:
-
-`long_interval`
-:   The polling interval when `interval` returns success (default: 300).
-
-`short_interval`
-:   The polling interval when `interval` returns failure (default: 30).
diff --git a/conf b/conf
index cff836d..e538b60 100644
--- a/conf
+++ b/conf
@@ -1,4 +1,10 @@
 battery=/sys/class/power_supply/BAT0/uevent
-interval() { ./battcheck min_time=1200 min_pct=16 "$battery"; }
+interval() {
+	if ./battcheck min_time=1200 min_pct=16 "$battery"; then
+		sleep 300
+	else
+		sleep 30
+	fi
+}
 check() { ./battcheck min_time=600 min_pct=8 "$battery"; }
 failed() { zzz -H; }
diff --git a/run b/run
index 784c89c..03f7d08 100755
--- a/run
+++ b/run
@@ -9,11 +9,7 @@ check
 laststatus=$?
 
 while :; do
-	if interval; then
-		sleep "${long_interval-300}"
-	else
-		sleep "${short_interval-30}"
-	fi
+	interval
 	check
 	status=$?
 	if [ "$laststatus" -eq 0 ] && [ "$status" -ne 0 ]; then
-- 
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