Refactor "{declare -{f,F} => _omb_util_function_exists}"

Co-authored-by: Koichi Murase <myoga.murase@gmail.com>

completions/docker-compose.completion.sh

@@ -552,7 +552,7 @@ _docker_compose() {
 	done
 
 	local completions_func=_docker_compose_${command//-/_}
-	declare -F $completions_func >/dev/null && $completions_func
+	_omb_util_function_exists $completions_func && $completions_func
 
 	eval "$previous_extglob_setting"
 	return 0

completions/docker-machine.completion.sh

@@ -243,7 +243,7 @@ _docker_machine() {
     done
 
     local completion_func=_docker_machine_"${command//-/_}"
-    if declare -F "${completion_func}" > /dev/null; then
+    if _omb_util_function_exists "${completion_func}"; then
         ${completion_func}
     fi
 

completions/docker.completion.sh

@@ -394,7 +394,7 @@ __docker_subcommands() {
 				subcommand_pos=$counter
 				local subcommand=${words[$counter]}
 				local completions_func=_docker_${command}_${subcommand}
-				declare -F $completions_func >/dev/null && $completions_func
+				_omb_util_function_exists $completions_func && $completions_func
 				return 0
 				;;
 		esac
@@ -2953,7 +2953,7 @@ _docker() {
 	fi
 
 	local completions_func=_docker_${command}
-	declare -F $completions_func >/dev/null && $completions_func
+	_omb_util_function_exists $completions_func && $completions_func
 
 	eval "$previous_extglob_setting"
 	return 0

completions/gh.completion.sh

@@ -3,7 +3,7 @@
 # This script complements the completion script that ships with git.
 
 # Check that git tab completion is available
-if declare -F _git > /dev/null; then
+if _omb_util_function_exists _git; then
   # Duplicate and rename the 'list_all_commands' function
   eval "$(declare -f __git_list_all_commands | \
         sed 's/__git_list_all_commands/__git_list_all_commands_without_hub/')"

completions/hub.completion.sh

@@ -3,12 +3,12 @@
 # This script complements the completion script that ships with git.
 
 # If there is no git tab completion, but we have the _completion loader try to load it
-if ! declare -F _git > /dev/null && declare -F _completion_loader > /dev/null; then
+if ! _omb_util_function_exists _git && _omb_util_function_exists _completion_loader; then
   _completion_loader git
 fi
 
 # Check that git tab completion is available
-if declare -F _git > /dev/null; then
+if _omb_util_function_exists _git; then
   # Duplicate and rename the 'list_all_commands' function
   eval "$(declare -f __git_list_all_commands | \
         sed 's/__git_list_all_commands/__git_list_all_commands_without_hub/')"

completions/maven.completion.sh

@@ -6,7 +6,7 @@
 
 function_exists()
 {
-	declare -F $1 > /dev/null
+	_omb_util_function_exists $1
 	return $?
 }
 
@@ -261,4 +261,4 @@ _mvn()
 }
 
 complete -o default -F _mvn -o nospace mvn
-complete -o default -F _mvn -o nospace mvnDebug
+complete -o default -F _mvn -o nospace mvnDebug

completions/packer.completion.sh

@@ -130,7 +130,7 @@ _packer_completion ()
     # Words containing an equal sign get split into tokens in bash > 4, which
     # doesn't come in handy here.
     # This is handled here. bash < 4 does not split.
-    declare -f _get_comp_words_by_ref >/dev/null && _get_comp_words_by_ref -n = cur
+    _omb_util_function_exists _get_comp_words_by_ref && _get_comp_words_by_ref -n = cur
 
     COMPREPLY=()
     local i c=1 command
@@ -157,7 +157,7 @@ _packer_completion ()
     fi
 
     local completion_func="__packer_${command}"
-    declare -f $completion_func >/dev/null && $completion_func
+    _omb_util_function_exists $completion_func && $completion_func
 }
 
 complete -o nospace -F _packer_completion packer

themes/dulcie/dulcie.theme.sh

@@ -77,7 +77,7 @@ _omb_theme_PROMPT_COMMAND() {
   printf "\033]0;%s@%s:%s\007" "${USER}" "${HOSTNAME%%.*}" "${PWD/#$HOME/\~}"
 
   # Open the new terminal in the same directory
-  declare -f __vte_osc7 > /dev/null && __vte_osc7
+  _omb_util_function_exists __vte_osc7 && __vte_osc7
 
   PS1="${_omb_prompt_reset_color}[${DULCIE_USER}@${DULCIE_HOST}$(scm_prompt_info)${_omb_prompt_reset_color} ${DULCIE_WORKINGDIR}]"
   if [[ "${DULCIE_MULTILINE}" -eq "1" ]]; then