From 0cac0038954053c53af34fdcb2f46ebafb37828e Mon Sep 17 00:00:00 2001
From: EuAndreh <eu@euandre.org>
Date: Sun, 24 Jan 2021 13:48:16 -0300
Subject: remembering: Append to in-memory string instead of intermediate file

---
 remembering | 35 ++++++++++++++++++-----------------
 1 file changed, 18 insertions(+), 17 deletions(-)

diff --git a/remembering b/remembering
index 5ab7337..c789757 100755
--- a/remembering
+++ b/remembering
@@ -71,46 +71,47 @@ fi
 SORTED_STDIN="$(mktemp)"
 cat | sort > "$SORTED_STDIN"
 
-cmp() {
-	BEFORE="$(printf '%s\n%s\n' "$1" "$2")"
-	AFTER="$(echo "$BEFORE" | sort)"
-	if [ "$BEFORE" = "$AFTER" ]; then
-		return 0
-	else
-		return 1
-	fi
+MERGED=''
+MERGEDF="$(mktemp)"
+append() {
+	MERGED="$MERGED${MERGED:+
+}$1"
+}
+
+end() {
+	echo "$MERGED" > "$MERGEDF"
+	exit
 }
 
 get_left() {
 	if ! IFS='' read -r LEFT  <&3; then
-		exit 0
+		end
 	fi
 }
 
 get_right() {
 	if ! IFS='' read -r RIGHT_RANKED <&4; then
 		while IFS='' read -r LEFT; do
-			echo "0:$LEFT" >> "$MERGED"
+			append "0:$LEFT"
 		done <&3
-		exit 0
+		end
 	fi
 }
 
-MERGED="$(mktemp)"
 (
 	get_right
 	get_left
 	while true; do
 		RIGHT="$(echo "$RIGHT_RANKED" | cut -d: -f2-)"
 		if [ "$LEFT" = "$RIGHT" ]; then
-			echo "$RIGHT_RANKED" >> "$MERGED"
+			append "$RIGHT_RANKED"
 			get_right
 			get_left
 			continue
 		fi
 
-		if cmp "$LEFT" "$RIGHT"; then
-			echo "0:$LEFT" >> "$MERGED"
+		if [ "$(expr "$LEFT" \< "$RIGHT")" = 1 ]; then
+			append "0:$LEFT"
 			get_left
 			continue
 		else
@@ -120,7 +121,7 @@ MERGED="$(mktemp)"
 	done
 ) 3<"$SORTED_STDIN" 4<"$PROFILE"
 
-CHOICE="$(sort -t: -k1nr,1 -k2,2 < "$MERGED" | \
+CHOICE="$(sort -t: -k1nr,1 -k2,2 < "$MERGEDF" | \
 	cut -d: -f2- | \
 	sh -c "$COMMAND")"
 
@@ -135,7 +136,7 @@ if [ -n "$CHOICE" ]; then
 		else
 			echo "$LINE_RANKED" >> "$NEW_PROFILE"
 		fi
-	done < "$MERGED"
+	done < "$MERGEDF"
 fi
 
 mv "$NEW_PROFILE" "$PROFILE"
-- 
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