From f0baa933d31d3c80b168752ede43b6d305a005f5 Mon Sep 17 00:00:00 2001
From: Erich Eckner <git@eckner.net>
Date: Fri, 15 Jun 2018 13:15:46 +0200
Subject: bin/ii-answer: remove found regexes atomically if possible

---
 bin/ii-answer | 20 +++++++++-----------
 1 file changed, 9 insertions(+), 11 deletions(-)

diff --git a/bin/ii-answer b/bin/ii-answer
index ec234f1..5a7bc53 100755
--- a/bin/ii-answer
+++ b/bin/ii-answer
@@ -10,17 +10,15 @@
 # welcome devs (in #archlinux32 only)
 welcome_user_regex='^\S\+ -!- \(abaumann\|deep42thought\|tyzoid\|phrik\)(.* has joined \S\+$'
 new_users=$(
-  sed -n '
+  sed -i '
     s/'"${welcome_user_regex}"'/\1/
     T
-    p
+    w /dev/stdout
+    d
   ' "${irc_dir}/#archlinux32/out" | \
     sort -u
 )
 if [ -n "${new_users}" ]; then
-  sed -i '
-    /'"${welcome_user_regex}"'/ d
-  ' "${irc_dir}/#archlinux32/out"
   printf '%s\n' "${new_users}" | \
     sed '
       s/^/Hi /
@@ -46,10 +44,11 @@ find "${irc_dir}" \
     # answer "why don't you?"
     regex='^\(\S\+ \)\?\S\+ <\S\+> '"${prefix}"'why[- ]don'"'"'\?t[- ]you \(build\|stabilize\|unstage\|keep\|stubbornly_keep\) '
     if grep -q "${regex}" "${out_file}"; then
-      sed -n '
+      sed -i '
         s/'"${regex}"'/\2 /
         T
-        p
+        w /dev/stdout
+        d
       ' "${out_file}" | \
         while read -r line; do
           reason=$(
@@ -65,15 +64,15 @@ find "${irc_dir}" \
           fi | \
             irc_say "${channel}" 'copy'
         done
-      sed -i "/${regex}/d" "${out_file}"
     fi
     # answer "wtf?"
     regex='^\(\S\+ \)\?\S\+ <\S\+> '"${prefix}"'wtf '
     if grep -q "${regex}" "${out_file}"; then
-      sed -n '
+      sed -i '
         s/'"${regex}"'//
         T
-        p
+        w /dev/stdout
+        d
       ' "${out_file}" | \
         while read -r line; do
           reason=$("${base_dir}/bin/wtf" "${line}");
@@ -89,7 +88,6 @@ find "${irc_dir}" \
           fi | \
             irc_say "${channel}" 'copy'
         done
-      sed -i "/${regex}/d" "${out_file}"
     fi
     # answer "What's up?"
     regex='^\(\S\+ \)\?\S\+ <\S\+> .*[Ww]hat'"'"'\?s *[Uu]p'
-- 
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