fix: working under Zsh

README.md

@@ -14,7 +14,7 @@ Has such, you may find it a little bit disconcerting at first.
 But we believe that the advantages of this design makes it worth the effort.
 
 
-NOTE: as of now, DotMatrix only work for Bash (> 3.2), but not for Zsh. That will hopefully change in the future.
+NOTE: as of now, DotMatrix may be a little bugged on Zsh.
 
 
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dotmatrix.theme

@@ -282,7 +282,7 @@ _lp_dotmatrix_theme_directory() {
 
 _lp_dotmatrix_theme_prompt() {
 
-    local header inline prompt
+    local header inline dotmatrix_prompt
 
     # Arguments: fg, bg, bold, underline, fallback_fg, fallback_bg
     # Color codes can be any integer in 256 XTerm's system colors in [0–255].
@@ -296,6 +296,7 @@ _lp_dotmatrix_theme_prompt() {
     # HEADER (LEFT)
     ####################################################################
 
+    # PS1="headering> "
     header=""
     header+="${_DOTMATRIX_DISPLAY}"
     header+="${_DOTMATRIX_CONNECTION}"
@@ -549,7 +550,7 @@ _lp_dotmatrix_theme_prompt() {
 
     inline_right+="${DOTMATRIX_LINE}"
 
-    local inline
+    local inline=
     # FIXME use _lp_fill-like function to handle multi-character line?
     if ((DOTMATRIX_ENABLE_GRADIENT_LINE)); then
         # Fill up the center section with a line colored as a gradient.
@@ -587,35 +588,35 @@ _lp_dotmatrix_theme_prompt() {
     # PROMPT LINE
     ####################################################################
 
-    prompt=""
+    dotmatrix_prompt=""
     lp_terminal_format ${DOTMATRIX_COLOR_DARK[@]+"${DOTMATRIX_COLOR_DARK[@]}"}
 
     if (( LP_ENABLE_WIFI_STRENGTH )) ; then
         if _lp_wifi_signal_strength ; then
             lp_terminal_format ${DOTMATRIX_COLOR_WARN[@]+"${DOTMATRIX_COLOR_WARN[@]}"}
-            prompt+="${lp_terminal_format}${LP_MARK_WIFI}"
+            dotmatrix_prompt+="${lp_terminal_format}${LP_MARK_WIFI}"
         else
-            prompt+="${lp_terminal_format}${LP_MARK_WIFI}"
+            dotmatrix_prompt+="${lp_terminal_format}${LP_MARK_WIFI}"
         fi
     else
-        prompt+="${lp_terminal_format}·"
+        dotmatrix_prompt+="${lp_terminal_format}·"
     fi
 
     if _lp_http_proxy ; then
         __dotmatrix_make_sep_link ${DOTMATRIX_COLOR_LITE[@]+"${DOTMATRIX_COLOR_LITE[@]}"}
-        prompt+="${dotmatrix_sep}"
+        dotmatrix_prompt+="${dotmatrix_sep}"
     else
         __dotmatrix_make_sep_plug ${DOTMATRIX_COLOR_LITE[@]+"${DOTMATRIX_COLOR_LITE[@]}"}
-        prompt+="${dotmatrix_sep}"
+        dotmatrix_prompt+="${dotmatrix_sep}"
     fi
 
     __dotmatrix_prompt_vcs
-    prompt+="${_DOTMATRIX_VCS}"
+    dotmatrix_prompt+="${_DOTMATRIX_VCS}"
 
     if _lp_runtime_format ; then
         __dotmatrix_make_sep_plug ${DOTMATRIX_COLOR_NOTE[@]+"${DOTMATRIX_COLOR_NOTE[@]}"}
         __dotmatrix_make_field "${lp_runtime_format}" ${DOTMATRIX_COLOR_NOTE[@]+"${DOTMATRIX_COLOR_NOTE[@]}"}
-        prompt+="${dotmatrix_sep}${dotmatrix_field}"
+        dotmatrix_prompt+="${dotmatrix_sep}${dotmatrix_field}"
     fi
 
     if _lp_error ; then
@@ -627,11 +628,11 @@ _lp_dotmatrix_theme_prompt() {
         fi
         __dotmatrix_make_sep_link ${DOTMATRIX_COLOR_WARN[@]+"${DOTMATRIX_COLOR_WARN[@]}"}
         __dotmatrix_make_field "${DOTMATRIX_MARK_ERROR}${DOTMATRIX_SPACE_VOID}${error_msg}" ${DOTMATRIX_COLOR_WARN[@]+"${DOTMATRIX_COLOR_WARN[@]}"}
-        prompt+="${dotmatrix_sep}${dotmatrix_field}"
+        dotmatrix_prompt+="${dotmatrix_sep}${dotmatrix_field}"
     fi
 
     __dotmatrix_make_sep_plug ${DOTMATRIX_COLOR_MARK[@]+"${DOTMATRIX_COLOR_MARK[@]}"}
-    prompt+="${dotmatrix_sep}"
+    dotmatrix_prompt+="${dotmatrix_sep}"
     lp_terminal_format ${DOTMATRIX_COLOR_MARK[@]+"${DOTMATRIX_COLOR_MARK[@]}"}
     local mark_color="$lp_terminal_format"
 
@@ -639,11 +640,11 @@ _lp_dotmatrix_theme_prompt() {
     if _lp_shell_level ; then
         local i
         for ((i=0; i < lp_shell_level-1; i++)); do
-            prompt+="${mark_color}${DOTMATRIX_MARK}"
+            dotmatrix_prompt+="${mark_color}${DOTMATRIX_MARK}"
         done
     fi
 
-    # Warning prompt mark if either root or sudo.
+    # Warning dotmatrix_prompt mark if either root or sudo.
     _lp_user
     user="$?"
     # No need to check LP_ENABLE_SUDO, _lp_sudo_active does it.
@@ -653,16 +654,16 @@ _lp_dotmatrix_theme_prompt() {
         local dcwfg="${DOTMATRIX_COLOR_WARN[_LP_FIRST_INDEX+1]}"
         [[ -z $dcwfg ]] && dcwfg=-1
         lp_terminal_format $dcwfg
-        prompt+="${lp_terminal_format}${DOTMATRIX_MARK}"
+        dotmatrix_prompt+="${lp_terminal_format}${DOTMATRIX_MARK}"
     else
-        prompt+="${mark_color}${DOTMATRIX_MARK}"
+        dotmatrix_prompt+="${mark_color}${DOTMATRIX_MARK}"
     fi
 
-    prompt+="${NO_COL}"
+    dotmatrix_prompt+="${NO_COL}"
 
     # Assemble and setup
     local n=$'\n'
-    PS1="${n}${header}${n}${inline}${n}${prompt} "
+    PS1="${n}${header}${n}${inline}${n}${dotmatrix_prompt} "
 }
 
 
@@ -875,7 +876,7 @@ __dotmatrix_directory_path() {
 
 
 ########################################################################
-# Functions called at prompt update.
+# Functions called at dotmatrix_prompt update.
 ########################################################################
 
 __dotmatrix_prompt_vcs() {