gsu subcommand: Add gsu_get_unnamed_arg_num().

This will be handy for many gsu applications.

diff --git a/misc/gsu/subcommand b/misc/gsu/subcommand
index 84c0174ccbdaaf5b7ef8e22bb1a032b485b4c46e..5ccb3fc54fd309065482522b67a22c6e292934f2 100644 (file)
--- a/misc/gsu/subcommand
+++ b/misc/gsu/subcommand
@@ -469,6 +469,47 @@ gsu_cword_is_option_parameter()
        ret=0
 }
 
+# Get the word number on which the cursor is, not counting options.
+#
+# This is useful for completing commands whose possible completions depend
+# on the word number, for example mount.
+#
+# $1:   Getopt option string.
+# $2:   The current word number.
+# $3..: All words of the current command line.
+#
+# return: If the current word is an option, or a parameter to an option,
+# this function sets $result to -1. Otherwise, the number of the non-option
+# is returned in $result.
+#
+gsu_get_unnamed_arg_num()
+{
+       local opts="$1" cword="$2" prev cur
+       local -i i n=0
+       local -a words
+
+       shift 2
+       words=("$@")
+       cur="${words[$cword]}"
+       prev="${words[$(($cword - 1))]}"
+       result=-1
+       [[ "$cur" == -* ]] && return
+       [[ "$prev" == -* ]] && [[ "$opts" == *${prev#-}:* ]] && return
+
+       for ((i=1; i <= $cword; i++)); do
+               prev="${words[$(($i - 1))]}"
+               cur="${words[$i]}"
+               [[ "$cur" == -* ]] && continue
+               if [[ "$prev" == -* ]]; then
+                       opt=${prev#-}
+                       [[ "$opts" != *$opt:* ]] && let n++
+                       continue
+               fi
+               let n++
+       done
+       result="$(($n - 1))"
+}
+
 gsu()
 {
        local i