From 8aacb4d5fbb4909efa1531e7883c14865387ccd5 Mon Sep 17 00:00:00 2001
From: Kaz Kylheku <kaz@kylheku.com>
Date: Thu, 24 Mar 2022 03:05:23 -0700
Subject: don't create temp file when not needed.

---
 cppawk | 31 +++++++++++++++++--------------
 1 file changed, 17 insertions(+), 14 deletions(-)

diff --git a/cppawk b/cppawk
index f33cab8..7b166a0 100755
--- a/cppawk
+++ b/cppawk
@@ -154,25 +154,28 @@ done
 awk="command $(quote "$awk")"
 prepro="command $(quote "$prepro")"
 
-trap 'rm -f $tmp_file' EXIT INT TERM
-
 if [ -n "$awk_file" ] ; then
-  tmp_file=$(mktemp)
   awk_file_dir=$(dirname "$awk_file")
-  $delhashbang "$awk_file" | \
-    eval "$prepro $incopt\"$awk_file_dir\" $prepro_opts -" | \
-    collapse > $tmp_file
-  [ $prepro_only ] \
-    && cat $tmp_file \
-    || eval "$awk $awk_opts -f $tmp_file -- \"\$@\""
+  if [ $prepro_only ] ; then
+    $delhashbang "$awk_file" \
+    | eval "$prepro $incopt\"$awk_file_dir\" $prepro_opts - | collapse"
+  else
+    trap 'rm -f $tmp_file' EXIT INT TERM
+    tmp_file=$(mktemp)
+    $delhashbang "$awk_file" \
+    | eval "$prepro $incopt\"$awk_file_dir\" $prepro_opts - | collapse" \
+    > $tmp_file
+    eval "$awk $awk_opts -f $tmp_file -- \"\$@\""
+  fi
 elif [ $# -gt 0 ] ; then
-  tmp_file=$(mktemp)
   if [ $prepro_only ] ; then
-    printf "%s" "$1" | $delhashbang | \
-      eval "$prepro $incopt"$(pwd)" $prepro_opts - | collapse"
+    printf "%s" "$1" | $delhashbang \
+    | eval "$prepro $incopt"$(pwd)" $prepro_opts - | collapse"
   else
-    printf "%s" "$1" | $delhashbang | \
-      eval "$prepro $incopt"$(pwd)" $prepro_opts - | collapse" > $tmp_file
+    trap 'rm -f $tmp_file' EXIT INT TERM
+    tmp_file=$(mktemp)
+    printf "%s" "$1" | $delhashbang \
+    | eval "$prepro $incopt"$(pwd)" $prepro_opts - | collapse" > $tmp_file
     shift
     eval "$awk $awk_opts -f $tmp_file -- \"\$@\""
   fi
-- 
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