From c5fbe36d5e71a94589039ad9bc422da543fddf01 Mon Sep 17 00:00:00 2001
From: EuAndreh <eu@euandre.org>
Date: Fri, 10 May 2024 08:25:12 -0300
Subject: src/ifnew: Add working utility

---
 deps.mk   |  1 +
 src/ifnew | 33 +++++++++++++++++++++++++++++++++
 2 files changed, 34 insertions(+)
 create mode 100755 src/ifnew

diff --git a/deps.mk b/deps.mk
index dec3a78..0a6adda 100644
--- a/deps.mk
+++ b/deps.mk
@@ -2,6 +2,7 @@ sources.sh = \
 	src/assert-arg \
 	src/clock \
 	src/color \
+	src/ifnew \
 	src/minutes \
 	src/mkdtemp \
 	src/mkstemp \
diff --git a/src/ifnew b/src/ifnew
new file mode 100755
index 0000000..c293f63
--- /dev/null
+++ b/src/ifnew
@@ -0,0 +1,33 @@
+#!/bin/sh
+set -eu
+
+usage() {
+	cat <<-'EOF'
+		Usage:
+		  ifnew [-v] FILE
+	EOF
+}
+
+MV_ARGS=''
+while getopts 'v' flag; do
+	case "$flag" in
+		(v)
+			MV_ARGS='-v'
+			;;
+		(*)
+			usage >&2
+			exit 2
+			;;
+	esac
+done
+shift $((OPTIND - 1))
+
+FILE="${1:-}"
+eval "$(assert-arg -- "$FILE" 'FILE')"
+
+
+STDIN="$FILE.$(uuid).tmp"
+trap 'rm -f "$STDIN"' EXIT
+
+cat - > "$STDIN"
+cmp -s "$STDIN" "$FILE" || mv $MV_ARGS "$STDIN" "$FILE"
-- 
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