completions/{ssh,rake,capistrano}: Do not rewrite COMP_WORDBREAKS

Fix https://github.com/ohmybash/oh-my-bash/issues/471

completions/capistrano.completion.sh

@@ -1,9 +1,12 @@
 #! bash oh-my-bash.module
 # Bash completion support for Capistrano.
 
-export COMP_WORDBREAKS=${COMP_WORDBREAKS/\:/}
+_omb_module_require lib:omb-completion
 
 function _omb_completion_cap {
+  local cur
+  _omb_completion_reassemble_breaks :
+
   if [[ -f Capfile ]]; then
     local recent=$(ls -t .cap_tasks~ Capfile **/*.cap 2> /dev/null | head -n 1)
     if [[ $recent != '.cap_tasks~' ]]; then
@@ -15,9 +18,10 @@ function _omb_completion_cap {
         cap --all --tasks | cut -d " " -f 2 > .cap_tasks~
       fi
     fi
-    COMPREPLY=($(compgen -W '$(< .cap_tasks)' -- "${COMP_WORDS[COMP_CWORD]}"))
-    return 0
+    COMPREPLY=($(compgen -W '$(< .cap_tasks)' -- "$cur"))
   fi
+
+  _omb_completion_resolve_breaks
 }
 
 complete -o default -o nospace -F _omb_completion_cap cap

completions/rake.completion.sh

@@ -1,17 +1,21 @@
 #! bash oh-my-bash.module
 # Bash completion support for Rake, Ruby Make.
 
-export COMP_WORDBREAKS=${COMP_WORDBREAKS/\:/}
+_omb_module_require lib:omb-completion
 
 function _omb_completion_rake {
+  local cur
+  _omb_completion_reassemble_breaks :
+
   if [[ -f Rakefile ]]; then
     local recent=$(ls -t .rake_tasks~ Rakefile **/*.rake 2> /dev/null | head -n 1)
     if [[ $recent != '.rake_tasks~' ]]; then
       rake --silent --tasks --all | cut -d " " -f 2 > .rake_tasks~
     fi
-    COMPREPLY=($(compgen -W '$(< .rake_tasks~)' -- "${COMP_WORDS[COMP_CWORD]}"))
-    return 0
+    COMPREPLY=($(compgen -W '$(< .rake_tasks~)' -- "$cur"))
   fi
+
+  _omb_completion_resolve_breaks
 }
 
 complete -o default -o nospace -F _omb_completion_rake rake

completions/ssh.completion.sh

@@ -1,10 +1,12 @@
 #! bash oh-my-bash.module
 # Bash completion support for ssh.
 
-export COMP_WORDBREAKS=${COMP_WORDBREAKS/\:/}
+_omb_module_require lib:omb-completion
 
 function _omb_completion_ssh {
-  local cur=${COMP_WORDS[COMP_CWORD]}
+  local cur
+  _omb_completion_reassemble_breaks :
+
   if [[ $cur == *@*  ]] ; then
     local -a options=(-P "${cur%%@*}@" -- "${cur#*@}")
   else
@@ -28,7 +30,7 @@ function _omb_completion_ssh {
     COMPREPLY+=($(compgen -W "$( grep -v '^[[:space:]]*$' /etc/hosts | grep -v '^#' | awk '{for (i=2; i<=NF; i++) print $i}' )" "${options[@]}"))
   fi
 
-  return 0
+  _omb_completion_resolve_breaks
 }
 
 complete -o default -o nospace -F _omb_completion_ssh ssh scp

lib/omb-completion.sh

@@ -0,0 +1,62 @@
+#! bash oh-my-bash.module
+# Copyright 2023 Koichi Murase.
+#
+# Helper functions for completions
+#
+
+## @fn _omb_completion_reassemble_breaks exclude
+##   @param[in] $1 exclude Characters to exclude from COMP_WORDSBREAKS
+##   @var[out] cur[0] Current word after reassembly
+##   @var[out] cur[1] Part of ${cur[0]} that was originally in previous words
+##     in COMP_WORDS.
+##   @arr[out] COMPREPLY This functions empties the array COMPREPLY.
+function _omb_completion_reassemble_breaks {
+  local exclude=$1
+  local line=$COMP_LINE point=$COMP_POINT
+  local breaks=${COMP_WORDBREAKS//[\"\'$exclude]}
+
+  COMPREPLY=()
+  cur=("${COMP_WORDS[COMP_CWORD]}" '')
+
+  local word rprefix= rword=
+  for word in "${COMP_WORDS[@]::COMP_CWORD+1}"; do
+    local space=${line%%"$word"*}
+    if [[ $space == "$line" ]]; then
+      # error: COMP_LINE does not contain enough words
+      return 1
+    fi
+
+    word=${word::point - ${#space}}
+    if [[ $space || $rword == *["$breaks"] || $word == ["$breaks"]* ]]; then
+      rprefix=
+      rword=$word
+    else
+      rprefix=$rword
+      rword+=$word
+    fi
+
+    line=${line:${#space}+${#word}}
+    ((point -= ${#space} + ${#word}))
+    ((point >= 0)) || break
+  done
+
+  cur=("$rword" "$rprefix")
+}
+
+## @fn _omb_completion_resolve_breaks
+##   Adjust completions generated for the reassembled word
+##   @var[out] cur[1] Prefix to remove set by _omb_completion_reassemble_breaks
+##   @arr[out] COMPREPLY This functions empties the array COMPREPLY.
+function _omb_completion_resolve_breaks {
+  if [[ ${cur[1]} ]]; then
+    local i
+    for i in "${!COMPREPLY[@]}"; do
+      if [[ ${COMPREPLY[i]} == "$cur_prefix"* ]]; then
+        COMPREPLY[i]=${COMPREPLY[i]#"$cur_prefix"}
+      else
+        unset -v 'COMPREPLY[i]'
+      fi
+    done
+    COMPREPLY=("${COMPREPLY[@]}")
+  fi
+}