Use perl instead of non-GNU sed

Fixes: #22

history-sync.plugin.zsh

@@ -11,7 +11,6 @@
 # * James Fraser <wulfgar.pro@gmail.com>
 #   https://www.wulfgar.pro
 # ----------------------------------------------------------------
-#
 autoload -U colors && colors
 
 alias zhpl=history_sync_pull
@@ -20,6 +19,7 @@ alias zhsync="history_sync_pull && history_sync_push"
 
 GIT=$(which git)
 GPG=$(which gpg)
+SED_VERSION=$(sed --version 2>&1)
 
 ZSH_HISTORY_PROJ="${ZSH_HISTORY_PROJ:-${HOME}/.zsh_history_proj}"
 ZSH_HISTORY_FILE_NAME="${ZSH_HISTORY_FILE_NAME:-.zsh_history}"
@@ -92,9 +92,15 @@ function _squash_multiline_commands_in_files() {
             && mv "${TMP_FILE_2}" "${TMP_FILE_1}"
 
         # Replace all \n with a sequence of symbols
-        SED ':a;N;$!ba;s/\n/'" ${NL_REPLACEMENT} "'/g' \
-            "${TMP_FILE_1}" > "${TMP_FILE_2}" \
-            && mv "${TMP_FILE_2}" "${TMP_FILE_1}"
+        if [[ "$SED_VERSION" == *"GNU"* ]]; then
+          SED ':a;N;$!ba;s/\n/'" ${NL_REPLACEMENT} "'/g' \
+              "${TMP_FILE_1}" > "${TMP_FILE_2}"
+        else
+          # Assume BSD `sed`
+          perl -0777 -pe 's/\n/'" ${NL_REPLACEMENT} "'/g' \
+            "${TMP_FILE_1}" > "${TMP_FILE_2}"
+        fi
+        mv "${TMP_FILE_2}" "${TMP_FILE_1}"
 
         # Replace first line anchor by \n
         SED "s/${FIRST_LINE_ANCHOR} \(: [0-9]\{1,10\}:[0-9]\+;\)/\n\1/g" \

test/test.zsh

@@ -38,6 +38,7 @@ function check_env_exists() {
 }
 
 function check_history() {
+    cat ~/.zsh_history 
     rg -U "$1" ~/.zsh_history >/dev/null
     [[ $? -eq 0 ]] || {failure "FAILURE: History did not match '$1'"}
 }
@@ -111,3 +112,14 @@ done" >> ~/.zsh_history
 zhps -y -r $UID && zhpl -y
 check_history "^1 for i in \{1..3\}; do\necho \\\$i\ndone$"
 success "SUCCESS"
+
+info "TEST SYNC HISTORY MULTI-LINE PERL"
+setup
+alias sed="echo"
+echo "1 for i in {1..3}; do
+echo \$i
+done" >> ~/.zsh_history
+zhps -y -r $UID && zhpl -y
+check_history "^1 for i in \{1..3\}; do\necho \\\$i\ndone$"
+unalias sed
+success "SUCCESS"