improve: decrease rate of errors/false positives

- avoid showing useless results (e.g : alias found himself...)
- better handling of quotes/double quotes/dollars sign in searches, by
  switching to fgrep (thanks to
  https://unix.stackexchange.com/q/32018/220566 for the idea)

dot_zsh_functions

@@ -135,6 +135,7 @@ function whichfunc() {
     type -a $1
 }
 # TODO : suggest using long parameter names instead of short ones....
+# TODO : suggest spelling fixes
 function suggest_code_refactoring() {
     #inspired by : \grep 'awk '\''{$1=$1};1'\' $HOME/Code/dotfiles/dot_zsh*
     header "code refactoring suggestions"
@@ -142,14 +143,13 @@ function suggest_code_refactoring() {
         local short_name=$(echo "$line" | sed -E "s/='.*//g")
         local alias_value=$(echo "$line" | sed -E 's/[a-zA-Z_-]+=//g')
         local alias_value_truncated=${alias_value:1:$((${#alias_value} - 2))}
-        #arrow "looking for opportunities to use alias $short_name instead of $alias_value_truncated"
-        \grep "$alias_value_truncated" $HOME/Code/dotfiles/dot_zsh_funct* 2>/tmp/error.log #/dev/null
+        \fgrep $alias_value_truncated "$@" 2>/tmp/error.log | \grep -v "alias $short_name=" 1>/dev/null
         if [ $? -eq 0 ]; then
             success "found $short_name --> $alias_value_truncated"
-            \grep "$alias_value_truncated" $HOME/Code/dotfiles/dot_zsh_funct* --color -n -H --line-buffered #2>/dev/null
+            \fgrep "$alias_value_truncated" "$@" --color -n -H --line-buffered | \grep -v "alias $short_name="
         else
             local error_message=$(\cat /tmp/error.log)
-            if [ ! -z "$error_message" ]; then
+            if [ -n "$error_message" ]; then
                 error "issue occured when looking for $alias_value_truncated : $error_message"
             fi
         fi