fix(completions/*): scan until cword instead of ${#words[@]}-1

We find in the codebase many loops scanning the arguments excluding
the last word (i.e., the loop condition is `i < ${#words[@]} - 1`).

The earliest versions of this type of loops were introduced in commit
e8d1508 in the form of `${#COMP_WORDS}-1` when the completions for
the `apt-*` commands are introduced.  There is no explanation about
the reason that the last word is excluded. [ Note: `${#COMP_WORDS}`
counting characters instead of words is clearly wrong but later fixed
to be `${#COMP_WORDS[@]}` in commit 57437d5. ]

Those are likely to be intended to exclude the word we currently try
to complete.  If that is the case, we should instead exclude all the
words at the current word and later words (i.e., the loop condition is
`i < cword`).  The value of `cword` matches `${#words[@]} - 1` in a
typical case where the tab completion is attempted at the end of the
command line, but this assumption breaks down when the user attempts a
completion in the middle of the command line.

completions/_yum

@@ -45,7 +45,7 @@ _comp_cmd_yum()
     _comp_initialize -s -- "$@" || return
 
     local special="" i
-    for ((i = 1; i < ${#words[@]} - 1; i++)); do
+    for ((i = 1; i < cword; i++)); do
         if [[ ${words[i]} == @(install|update|upgrade|remove|erase|deplist|info) ]]; then
             special=${words[i]}
             break

completions/apt-build

@@ -6,7 +6,7 @@ _comp_cmd_apt_build()
     _comp_initialize -- "$@" || return
 
     local special="" i
-    for ((i = 1; i < ${#words[@]} - 1; i++)); do
+    for ((i = 1; i < cword; i++)); do
         if [[ ${words[i]} == @(install|remove|source|info|clean) ]]; then
             special=${words[i]}
             break

completions/apt-get

@@ -22,7 +22,7 @@ _comp_cmd_apt_get()
     _comp_initialize -n ':=' -- "$@" || return
 
     local special="" i
-    for ((i = 1; i < ${#words[@]} - 1; i++)); do
+    for ((i = 1; i < cword; i++)); do
         if [[ ${words[i]} == @(install|remove|auto?(-)remove|purge|source|build-dep|download|changelog) ]]; then
             special=${words[i]}
             break

completions/apt-mark

@@ -6,7 +6,7 @@ _comp_cmd_apt_mark()
     _comp_initialize -s -- "$@" || return
 
     local special="" i
-    for ((i = 1; i < ${#words[@]} - 1; i++)); do
+    for ((i = 1; i < cword; i++)); do
         if [[ ${words[i]} == @(auto|manual|minimize-manual|showauto|showmanual|hold|unhold|showhold|install|remove|deinstall|purge|showinstall|showremove|showpurge) ]]; then
             special=${words[i]}
             break

completions/ip

@@ -43,7 +43,7 @@ _comp_cmd_ip()
     esac
 
     local subcword cmd="" has_cmd="" subcmd=""
-    for ((subcword = 1; subcword < ${#words[@]} - 1; subcword++)); do
+    for ((subcword = 1; subcword < cword; subcword++)); do
         [[ ${words[subcword]} == -b?(atch) ]] && return
         [[ $has_cmd ]] && subcmd=${words[subcword]} && break
         [[ ${words[subcword]} != -* &&

completions/ipmitool

@@ -66,7 +66,7 @@ _comp_cmd_ipmitool()
         sel pef sol tsol isol user channel session sunoem kontronoem picmg fwum
         firewall shell exec set hpm ekanalyzer)
     local i c cmd="" has_cmd="" subcmd
-    for ((i = 1; i < ${#words[@]} - 1; i++)); do
+    for ((i = 1; i < cword; i++)); do
         [[ $has_cmd ]] && subcmd=${words[i]} && break
         for c in "${cmds[@]}"; do
             [[ ${words[i]} == "$c" ]] && cmd=$c has_cmd=set && break

completions/jarsigner

@@ -32,7 +32,7 @@ _comp_cmd_jarsigner()
 
     # Check if a jar was already given.
     local i jar=""
-    for ((i = 1; i < ${#words[@]} - 1; i++)); do
+    for ((i = 1; i < cword; i++)); do
         if [[ ${words[i]} == *.@(jar|apk) &&
             ${words[i - 1]} != -signedjar ]]; then
             jar=set

completions/mcrypt

@@ -48,7 +48,7 @@ _comp_cmd_mcrypt()
         _comp_compgen_filedir nc
     else
         local i decrypt=""
-        for ((i = 1; i < ${#words[@]} - 1; i++)); do
+        for ((i = 1; i < cword; i++)); do
             if [[ ${words[i]} == -@(d|-decrypt) ]]; then
                 _comp_compgen_filedir nc
                 decrypt=set

completions/mdtool

@@ -6,7 +6,7 @@ _comp_cmd_mdtool()
     _comp_initialize -- "$@" || return
 
     local command="" i
-    for ((i = 1; i < ${#words[@]} - 1; i++)); do
+    for ((i = 1; i < cword; i++)); do
         if [[ ${words[i]} == @(build|generate-makefiles|setup) ]]; then
             command=${words[i]}
             break

completions/mr

@@ -27,7 +27,7 @@ _comp_cmd_mr()
     # Determine if user has entered an `mr` command. Used to block top-level
     # (option and command) completions.
     local cmd has_cmd="" i
-    for ((i = 1; i < ${#words[@]} - 1; i++)); do
+    for ((i = 1; i < cword; i++)); do
         # shellcheck disable=SC2053
         if [[ ${words[i]} == $glob_commands ]]; then
             cmd="${words[i]}"

completions/pack200

@@ -46,7 +46,7 @@ _comp_cmd_pack200()
 
     # Check if a pack or a jar was already given.
     local i pack="" jar=""
-    for ((i = 1; i < ${#words[@]} - 1; i++)); do
+    for ((i = 1; i < cword; i++)); do
         case ${words[i]} in
             *.pack | *.pack.gz) pack=set ;;
             *.jar) jar=set ;;

completions/route

@@ -17,7 +17,7 @@ _comp_cmd_route()
     for opt in add del -host -net netmask metric mss window irtt reject mod \
         dyn reinstate dev default gw; do
         found=""
-        for ((i = 1; i < ${#words[@]} - 1; i++)); do
+        for ((i = 1; i < cword; i++)); do
             [[ ${words[i]} == "$opt" ]] && found=set && break
         done
         [[ $found ]] || COMPREPLY+=("$opt")