Tab completion support for additional archives for 'borg delete'

Bash and Fish tab completions now too support more than just one
archive provided for 'borg delete'.

scripts/shell_completions/bash/borg

@@ -143,32 +143,36 @@ _borg()
         return 0
     fi
 
+    # Get the repository name if available
+    # If there is a space before the "::" it means that no repository name was typed,
+    # so probably $BORG_REPO was set and we can still list the archives.
+    local repository_name=`expr match "${COMP_LINE}" "\(.*\)::"`
+    repository_name=${repository_name##* }
+
     # Listing archives.
-    # Since "::" is treated as separate word in bash,
+    # Since "::" is treated as separate word in Bash,
     #   it is $cur when the cursor is right behind it
     #   and $prev if the user has started to type an archive name.
-    local repository_name="" # If set, we'll list the archives
     local typed_word=""
+    local please_list_the_archives=false
     if [[ ${cur} == "::" ]] ; then
-        repository_name=${prev}
+        please_list_the_archives=true
     fi
     if [[ ${prev} == "::" ]] ; then
-        repository_name=${prevprev}
+        please_list_the_archives=true
         typed_word=${cur}
     fi
     # Second archive listing for borg diff
     if [[ ${COMP_LINE} =~ ^.*\ diff\ .*::[^\ ]+\ ${cur}$ ]] ; then
-        repository_name=`expr match "${COMP_LINE}" "\(.*\)::"`
-        repository_name=${repository_name##* }
+        please_list_the_archives=true
+        typed_word=${cur}
+    fi
+    # Additional archive listing for borg delete
+    if [[ ${COMP_LINE} =~ ^.*\ delete\ .*::[^\ ]+.*${cur}$ ]] ; then
+        please_list_the_archives=true
         typed_word=${cur}
     fi
-    if [[ ${repository_name} != "" ]] ; then
-        if [[ ${COMP_LINE} == *" ::"* ]] ; then
-            # There is a space before the "::"
-            # which means that no repository name was typed,
-            # so probably $BORG_REPO is set.
-            repository_name=""
-        fi
+    if [[ $please_list_the_archives = true ]] ; then
         local archive_list=$(borg list --short "${repository_name}" 2>/dev/null)
         COMPREPLY=( $(compgen -W "${archive_list}" -- "${typed_word}" ) )
         return 0

scripts/shell_completions/fish/borg.fish

@@ -360,7 +360,7 @@ function __fish_borg_list_repos_or_archives
     if string match --quiet --regex '.*::' '"'(commandline --current-token)'"'
         # If the current token contains "::" then list the archives:
         set -l repository_name (string replace --regex '::.*' '' (commandline --current-token))
-        borg list --format="$repository_name::{archive}{NEWLINE}" "$repository_name" ^/dev/null
+        borg list --format="$repository_name::{archive}{TAB}{comment}{NEWLINE}" "$repository_name" ^/dev/null
     else
         # Otherwise list the repositories, directories and user@host entries:
         set -l directories (commandline --cut-at-cursor --current-token)*/
@@ -378,15 +378,20 @@ end
 complete -c borg -f -n "__fish_borg_is_argument_n 2" -a '(__fish_borg_list_repos_or_archives)'
 
 
-# Second archive listing for borg diff
+# Additional archive listings
 
 function __fish_borg_is_diff_second_archive
     return (string match --quiet --regex ' diff .*::[^ ]+ '(commandline --current-token)'$' (commandline))
 end
 
-function __fish_borg_list_diff_archives
+function __fish_borg_is_delete_additional_archive
+    return (string match --quiet --regex ' delete .*::[^ ]+ ' (commandline))
+end
+
+function __fish_borg_list_only_archives
     set -l repo_matches (string match --regex '([^ ]*)::' (commandline))
-    borg list --format="{archive}{NEWLINE}" "$repo_matches[2]" ^/dev/null
+    borg list --format="{archive}{TAB}{comment}{NEWLINE}" "$repo_matches[2]" ^/dev/null
 end
 
-complete -c borg -f -n __fish_borg_is_diff_second_archive -a '(__fish_borg_list_diff_archives)'
+complete -c borg -f -n __fish_borg_is_diff_second_archive -a '(__fish_borg_list_only_archives)'
+complete -c borg -f -n __fish_borg_is_delete_additional_archive -a '(__fish_borg_list_only_archives)'