Removed usage of += as it’s unsupported on bash versions < 3.1.

completion/available/docker-compose.completion.bash

@@ -534,12 +534,12 @@ _docker_compose() {
 		case "${words[$counter]}" in
 			$(__docker_compose_to_extglob "$daemon_boolean_options") )
 				local opt=${words[counter]}
-				daemon_options+=($opt)
+				daemon_options=(${daemon_options[@]} $opt)
 				;;
 			$(__docker_compose_to_extglob "$daemon_options_with_args") )
 				local opt=${words[counter]}
 				local arg=${words[++counter]}
-				daemon_options+=($opt $arg)
+				daemon_options=(${daemon_options[@]} $opt $arg)
 				;;
 			-*)
 				;;

completion/available/docker.completion.bash

@@ -147,7 +147,7 @@ __docker_complete_containers_and_images() {
 	__docker_complete_containers_all
 	local containers=( "${COMPREPLY[@]}" )
 	__docker_complete_images
-	COMPREPLY+=( "${containers[@]}" )
+	COMPREPLY=( "${COMPREPLY[@]}" "${containers[@]}" )
 }
 
 # Returns the names and optionally IDs of networks.
@@ -235,7 +235,7 @@ __docker_complete_nodes() {
 
 __docker_complete_nodes_plus_self() {
 	__docker_complete_nodes "$@"
-	COMPREPLY+=( self )
+	COMPREPLY=( ${COMPREPLY[@]} self )
 }
 
 # Returns a list of all services. Additional arguments to `docker service ls`
@@ -2375,7 +2375,7 @@ _docker_run() {
 		seccomp)
 			local cur=${cur##*=}
 			_filedir
-			COMPREPLY+=( $( compgen -W "unconfined" -- "$cur" ) )
+			COMPREPLY=( ${COMPREPLY[@]} $( compgen -W "unconfined" -- "$cur" ) )
 			return
 			;;
 	esac

completion/available/go.completion.bash

@@ -86,7 +86,7 @@ _go()
               0)
                 _filedir go
                 _go_importpath_cache
-                COMPREPLY+=(`_go_importpath "$cur"`)
+                COMPREPLY=(${COMPREPLY[@]} `_go_importpath "$cur"`)
                 ;;
               1)
                 _filedir go

plugins/available/alias-completion.plugin.bash

@@ -49,7 +49,7 @@ function alias_completion {
                 eval "$completion_loader $alias_cmd"
                 # 124 means completion loader was successful
                 [[ $? -eq 124 ]] || continue
-                completions+=($alias_cmd)
+                completions=(${completions[@]} $alias_cmd)
             else
                 continue
             fi

plugins/available/projects.plugin.bash

@@ -34,7 +34,7 @@ fi
 # with the same name in project directories
 for i in ${PROJECT_PATHS//:/$'\n'}; do
   if [ -d "$i"/"$1" ]; then
-    dests+=("$i/$1")
+    dests=(${dests[@]} "$i/$1")
   fi
 done
 
@@ -49,7 +49,7 @@ elif [ ${#dests[@]} -eq 1 ]; then
 
 elif [ ${#dests[@]} -gt 1 ]; then
   PS3="Multiple project directories found. Please select one: "
-  dests+=("cancel")
+  dests=(${dests[@]} "cancel")
   select d in "${dests[@]}"; do
     case $d in
       "cancel")

themes/base.theme.bash

@@ -149,7 +149,7 @@ function git_prompt_minimal_info {
     SCM_BRANCH=${SCM_THEME_BRANCH_PREFIX}${ref}
 
     # Get the status
-    [[ "${SCM_GIT_IGNORE_UNTRACKED}" = "true" ]] && git_status_flags+='-untracked-files=no'
+    [[ "${SCM_GIT_IGNORE_UNTRACKED}" = "true" ]] && git_status_flags="${git_status_flags} -untracked-files=no"
     status=$(command git status ${git_status_flags} 2> /dev/null | tail -n1)
 
     if [[ -n ${status} ]]; then
@@ -208,15 +208,15 @@ function git_prompt_vars {
     if [[ "${untracked_count}" -gt 0 || "${unstaged_count}" -gt 0 || "${staged_count}" -gt 0 ]]; then
       SCM_DIRTY=1
       if [[ "${SCM_GIT_SHOW_DETAILS}" = "true" ]]; then
-        [[ "${staged_count}" -gt 0 ]] && details+=" ${SCM_GIT_STAGED_CHAR}${staged_count}" && SCM_DIRTY=3
+        [[ "${staged_count}" -gt 0 ]] && details="${details} ${SCM_GIT_STAGED_CHAR}${staged_count}" && SCM_DIRTY=3
-        [[ "${unstaged_count}" -gt 0 ]] && details+=" ${SCM_GIT_UNSTAGED_CHAR}${unstaged_count}" && SCM_DIRTY=2
+        [[ "${unstaged_count}" -gt 0 ]] && details="${details} ${SCM_GIT_UNSTAGED_CHAR}${unstaged_count}" && SCM_DIRTY=2
-        [[ "${untracked_count}" -gt 0 ]] && details+=" ${SCM_GIT_UNTRACKED_CHAR}${untracked_count}" && SCM_DIRTY=1
+        [[ "${untracked_count}" -gt 0 ]] && details="${details} ${SCM_GIT_UNTRACKED_CHAR}${untracked_count}" && SCM_DIRTY=1
       fi
       SCM_STATE=${GIT_THEME_PROMPT_DIRTY:-$SCM_THEME_PROMPT_DIRTY}
     fi
   fi
 
-  [[ "${SCM_GIT_SHOW_CURRENT_USER}" == "true" ]] && details+="$(git_user_info)"
+  [[ "${SCM_GIT_SHOW_CURRENT_USER}" == "true" ]] && details="${details}$(git_user_info)"
 
   SCM_CHANGE=$(git rev-parse --short HEAD 2>/dev/null)
 
@@ -237,15 +237,15 @@ function git_prompt_vars {
       if ([[ "${SCM_GIT_SHOW_REMOTE_INFO}" = "auto" ]] && [[ "${num_remotes}" -ge 2 ]]) ||
           [[ "${SCM_GIT_SHOW_REMOTE_INFO}" = "true" ]]; then
         remote_info="${remote_name}"
-        [[ "${same_branch_name}" != "true" ]] && remote_info+="/${remote_branch}"
+        [[ "${same_branch_name}" != "true" ]] && remote_info="${remote_info}/${remote_branch}"
       elif [[ ${same_branch_name} != "true" ]]; then
         remote_info="${remote_branch}"
       fi
       if [[ -n "${remote_info}" ]];then
         if [[ "${branch_gone}" = "true" ]]; then
-          SCM_BRANCH+="${SCM_THEME_BRANCH_GONE_PREFIX}${remote_info}"
+          SCM_BRANCH="${SCM_BRANCH}${SCM_THEME_BRANCH_GONE_PREFIX}${remote_info}"
         else
-          SCM_BRANCH+="${SCM_THEME_BRANCH_TRACK_PREFIX}${remote_info}"
+          SCM_BRANCH="${SCM_BRANCH}${SCM_THEME_BRANCH_TRACK_PREFIX}${remote_info}"
         fi
       fi
     fi
@@ -267,13 +267,13 @@ function git_prompt_vars {
 
   local ahead_re='.+ahead ([0-9]+).+'
   local behind_re='.+behind ([0-9]+).+'
-  [[ "${status}" =~ ${ahead_re} ]] && SCM_BRANCH+=" ${SCM_GIT_AHEAD_CHAR}${BASH_REMATCH[1]}"
+  [[ "${status}" =~ ${ahead_re} ]] && SCM_BRANCH="${SCM_BRANCH} ${SCM_GIT_AHEAD_CHAR}${BASH_REMATCH[1]}"
-  [[ "${status}" =~ ${behind_re} ]] && SCM_BRANCH+=" ${SCM_GIT_BEHIND_CHAR}${BASH_REMATCH[1]}"
+  [[ "${status}" =~ ${behind_re} ]] && SCM_BRANCH="${SCM_BRANCH} ${SCM_GIT_BEHIND_CHAR}${BASH_REMATCH[1]}"
 
   local stash_count="$(git stash list 2> /dev/null | wc -l | tr -d ' ')"
-  [[ "${stash_count}" -gt 0 ]] && SCM_BRANCH+=" {${stash_count}}"
+  [[ "${stash_count}" -gt 0 ]] && SCM_BRANCH="${SCM_BRANCH} {${stash_count}}"
 
-  SCM_BRANCH+=${details}
+  SCM_BRANCH="${SCM_BRANCH}${details}"
 
   SCM_PREFIX=${GIT_THEME_PROMPT_PREFIX:-$SCM_THEME_PROMPT_PREFIX}
   SCM_SUFFIX=${GIT_THEME_PROMPT_SUFFIX:-$SCM_THEME_PROMPT_SUFFIX}

themes/brainy/brainy.theme.bash

@@ -13,13 +13,13 @@ ____brainy_top_left_parse() {
 	args=( $1 )
 	IFS="${ifs_old}"
 	if [ -n "${args[3]}" ]; then
-		_TOP_LEFT+="${args[2]}${args[3]}"
+		_TOP_LEFT="${_TOP_LEFT}${args[2]}${args[3]}"
 	fi
-	_TOP_LEFT+="${args[0]}${args[1]}"
+	_TOP_LEFT="${_TOP_LEFT}${args[0]}${args[1]}"
 	if [ -n "${args[4]}" ]; then
-		_TOP_LEFT+="${args[2]}${args[4]}"
+		_TOP_LEFT="${_TOP_LEFT}${args[2]}${args[4]}"
 	fi
-	_TOP_LEFT+=" "
+	_TOP_LEFT="${_TOP_LEFT} "
 }
 
 ____brainy_top_right_parse() {
@@ -27,13 +27,13 @@ ____brainy_top_right_parse() {
 	IFS="|"
 	args=( $1 )
 	IFS="${ifs_old}"
-	_TOP_RIGHT+=" "
+	_TOP_RIGHT="${_TOP_RIGHT} "
 	if [ -n "${args[3]}" ]; then
-		_TOP_RIGHT+="${args[2]}${args[3]}"
+		_TOP_RIGHT="${_TOP_RIGHT}${args[2]}${args[3]}"
 	fi
-	_TOP_RIGHT+="${args[0]}${args[1]}"
+	_TOP_RIGHT="${_TOP_RIGHT}${args[0]}${args[1]}"
 	if [ -n "${args[4]}" ]; then
-		_TOP_RIGHT+="${args[2]}${args[4]}"
+		_TOP_RIGHT="${_TOP_RIGHT}${args[2]}${args[4]}"
 	fi
 	__TOP_RIGHT_LEN=$(( __TOP_RIGHT_LEN + ${#args[1]} + ${#args[3]} + ${#args[4]} + 1 ))
 	(( __SEG_AT_RIGHT += 1 ))
@@ -44,8 +44,8 @@ ____brainy_bottom_parse() {
 	IFS="|"
 	args=( $1 )
 	IFS="${ifs_old}"
-	_BOTTOM+="${args[0]}${args[1]}"
+	_BOTTOM="${_BOTTOM}${args[0]}${args[1]}"
-	[ ${#args[1]} -gt 0 ] && _BOTTOM+=" "
+	[ ${#args[1]} -gt 0 ] && _BOTTOM="${_BOTTOM} "
 }
 
 ____brainy_top() {
@@ -60,7 +60,7 @@ ____brainy_top() {
 	done
 
 	___cursor_right="\033[500C"
-	_TOP_LEFT+="${___cursor_right}"
+	_TOP_LEFT="${_TOP_LEFT}${___cursor_right}"
 
 	for seg in ${___BRAINY_TOP_RIGHT}; do
 		info="$(___brainy_prompt_"${seg}")"
@@ -69,7 +69,7 @@ ____brainy_top() {
 
 	[ $__TOP_RIGHT_LEN -gt 0 ] && __TOP_RIGHT_LEN=$(( __TOP_RIGHT_LEN - 1 ))
 	___cursor_adjust="\033[${__TOP_RIGHT_LEN}D"
-	_TOP_LEFT+="${___cursor_adjust}"
+	_TOP_LEFT="${_TOP_LEFT}${___cursor_adjust}"
 
 	printf "%s%s" "${_TOP_LEFT}" "${_TOP_RIGHT}"
 }
@@ -162,7 +162,7 @@ ___brainy_prompt_battery() {
 		color=$bold_red
 	fi
 	box="[|]"
-	ac_adapter_connected && info+="+"
+	ac_adapter_connected && info="${info}+"
 	[ "$info" == "100+" ] && info="AC"
 	printf "%s|%s|%s|%s" "${color}" "${info}" "${bold_white}" "${box}"
 }

themes/powerline-multiline/powerline-multiline.base.bash

@@ -18,7 +18,7 @@ function __powerline_right_segment {
     separator_color="$(set_color ${params[1]} ${LAST_SEGMENT_COLOR})"
     (( padding += 1 ))
   fi
-  RIGHT_PROMPT+="${separator_color}${separator_char}${normal}$(set_color - ${params[1]}) ${params[0]} ${normal}$(set_color - ${COLOR})${normal}"
+  RIGHT_PROMPT="${RIGHT_PROMPT}${separator_color}${separator_char}${normal}$(set_color - ${params[1]}) ${params[0]} ${normal}$(set_color - ${COLOR})${normal}"
   RIGHT_PROMPT_LENGTH=$(( ${#params[0]} + RIGHT_PROMPT_LENGTH + padding ))
   LAST_SEGMENT_COLOR="${params[1]}"
   (( SEGMENTS_AT_RIGHT += 1 ))
@@ -41,16 +41,16 @@ function __powerline_prompt_command {
     local info="$(__powerline_${segment}_prompt)"
     [[ -n "${info}" ]] && __powerline_left_segment "${info}"
   done
-  [[ -n "${LEFT_PROMPT}" ]] && LEFT_PROMPT+="$(set_color ${LAST_SEGMENT_COLOR} -)${separator_char}${normal}"
+  [[ -n "${LEFT_PROMPT}" ]] && LEFT_PROMPT="${LEFT_PROMPT}$(set_color ${LAST_SEGMENT_COLOR} -)${separator_char}${normal}"
 
   ## right prompt ##
   if [[ -n "${POWERLINE_RIGHT_PROMPT}" ]]; then
-    LEFT_PROMPT+="${move_cursor_rightmost}"
+    LEFT_PROMPT="${LEFT_PROMPT}${move_cursor_rightmost}"
     for segment in $POWERLINE_RIGHT_PROMPT; do
       local info="$(__powerline_${segment}_prompt)"
       [[ -n "${info}" ]] && __powerline_right_segment "${info}"
     done
-    LEFT_PROMPT+="\033[${RIGHT_PROMPT_LENGTH}D"
+    LEFT_PROMPT="${LEFT_PROMPT}\033[${RIGHT_PROMPT_LENGTH}D"
   fi
 
   PS1="${LEFT_PROMPT}${RIGHT_PROMPT}\n$(__powerline_last_status_prompt ${last_status})${PROMPT_CHAR} "

themes/powerline-naked/powerline-naked.base.bash

@@ -10,6 +10,6 @@ function __powerline_left_segment {
   if [[ "${SEGMENTS_AT_LEFT}" -gt 0 ]]; then
     separator="${separator_char}"
   fi
-  LEFT_PROMPT+="${separator}$(set_color ${params[1]} -) ${params[0]} ${normal}"
+  LEFT_PROMPT="${LEFT_PROMPT}${separator}$(set_color ${params[1]} -) ${params[0]} ${normal}"
   (( SEGMENTS_AT_LEFT += 1 ))
 }

themes/powerline-plain/powerline-plain.base.bash

@@ -5,7 +5,7 @@ function __powerline_left_segment {
   local params=( $1 )
   IFS="${OLD_IFS}"
 
-  LEFT_PROMPT+="${separator}$(set_color - ${params[1]}) ${params[0]} ${normal}"
+  LEFT_PROMPT="${LEFT_PROMPT}${separator}$(set_color - ${params[1]}) ${params[0]} ${normal}"
   LAST_SEGMENT_COLOR=${params[1]}
 }
 
@@ -20,7 +20,7 @@ function __powerline_prompt_command {
     [[ -n "${info}" ]] && __powerline_left_segment "${info}"
   done
   [[ "${last_status}" -ne 0 ]] && __powerline_left_segment $(__powerline_last_status_prompt ${last_status})
-  [[ -n "${LEFT_PROMPT}" ]] && LEFT_PROMPT+="$(set_color ${LAST_SEGMENT_COLOR} -) ${normal}"
+  [[ -n "${LEFT_PROMPT}" ]] && LEFT_PROMPT="${LEFT_PROMPT}$(set_color ${LAST_SEGMENT_COLOR} -) ${normal}"
 
   PS1="${LEFT_PROMPT} "
 

themes/powerline/powerline.base.bash

@@ -83,7 +83,7 @@ function __powerline_scm_prompt {
       color=${SCM_THEME_PROMPT_CLEAN_COLOR}
     fi
     if [[ "${SCM_GIT_CHAR}" == "${SCM_CHAR}" ]]; then
-      scm_prompt+="${SCM_CHAR}${SCM_BRANCH}${SCM_STATE}"
+      scm_prompt="${scm_prompt}${SCM_CHAR}${SCM_BRANCH}${SCM_STATE}"
     fi
     echo "${scm_prompt}${scm}|${color}"
   fi
@@ -132,7 +132,7 @@ function __powerline_left_segment {
   if [[ "${SEGMENTS_AT_LEFT}" -gt 0 ]]; then
     separator="$(set_color ${LAST_SEGMENT_COLOR} ${params[1]})${separator_char}${normal}"
   fi
-  LEFT_PROMPT+="${separator}$(set_color - ${params[1]}) ${params[0]} ${normal}"
+  LEFT_PROMPT="${LEFT_PROMPT}${separator}$(set_color - ${params[1]}) ${params[0]} ${normal}"
   LAST_SEGMENT_COLOR=${params[1]}
   (( SEGMENTS_AT_LEFT += 1 ))
 }
@@ -155,7 +155,7 @@ function __powerline_prompt_command {
     [[ -n "${info}" ]] && __powerline_left_segment "${info}"
   done
   [[ "${last_status}" -ne 0 ]] && __powerline_left_segment $(__powerline_last_status_prompt ${last_status})
-  [[ -n "${LEFT_PROMPT}" ]] && LEFT_PROMPT+="$(set_color ${LAST_SEGMENT_COLOR} -)${separator_char}${normal}"
+  [[ -n "${LEFT_PROMPT}" ]] && LEFT_PROMPT="${LEFT_PROMPT}$(set_color ${LAST_SEGMENT_COLOR} -)${separator_char}${normal}"
 
   PS1="${LEFT_PROMPT} "
 

themes/rana/rana.theme.bash

@@ -138,22 +138,22 @@ prompt_git() {
 
 			# Check for uncommitted changes in the index.
 			if ! $(git diff --quiet --ignore-submodules --cached); then
-				s+='+';
+				s=${s}'+';
 			fi;
 
 			# Check for unstaged changes.
 			if ! $(git diff-files --quiet --ignore-submodules --); then
-				s+='!';
+				s=${s}'!';
 			fi;
 
 			# Check for untracked files.
 			if [ -n "$(git ls-files --others --exclude-standard)" ]; then
-				s+='?';
+				s=${s}'?';
 			fi;
 
 			# Check for stashed files.
 			if $(git rev-parse --verify refs/stash &>/dev/null); then
-				s+='$';
+				s=${s}'$';
 			fi;
 
 		fi;