bash - How to complete filenames relative to another directory? -

this follow-up question discussion in:

https://bugs.launchpad.net/ubuntu/+source/bash-completion/+bug/1394920

suppose have folder ~/tmp files , directories:

$ mkdir a; touch file1.txt; mkdir a/b; mkdir a/c; touch a/d; mkdir a/b/c 

i try make completion script complete filenames in ~/tmp, complete -o filenames option working correctly if current directory ~/tmp.

see above link more background information. far got:

$ cat setup _comptest() {     local cur basefolder     cur="${comp_words[$comp_cword]}"     basefolder=~/tmp     compopt -o nospace     compreply=(  $(        cd "$basefolder"        if [[ ${cur: -1} != "/" && -d $cur ]] ;            echo "$cur/"        else            compgen -f "$cur"        fi       )  ) } complete -f _comptest aaa 

then source it:

$ . setup 

and can

$ aaa <tab><tab> 

• problem 1 : slashes not added @ end of directory names in completion list ( desired easy separate directories file names in completion list)

• problem 2 : aaa a/<tab><tab> completion list a/b a/c a/d a/ prefix should not there. should b/ c/ d instead.

i write function as:

_comptest ()  {      local cur; local tmp;  local tmp_escaped; local i;     _get_comp_words_by_ref cur;     local _compreply=()     tmp=~/tmp/     tmp_escaped=${tmp//\//\\\/}     cur=$tmp$cur;      if [ "$1" == "-d" ];         _cd     else         _filedir;     fi;     in "${compreply[@]}";         [ -d "$i" ] && [ "$i" != "$tmp." ] && [ "$i" != "$tmp.." ] && i="$i/"         _compreply=("${_compreply[@]}" "$i")     done      compreply=(${_compreply[@]/$tmp_escaped/}) } && complete -o nospace -f _comptest aaa_files  _comptestdir() {     _comptest -d } && complete -o nospace -f _comptestdir aaa_directories 

it has 3 parts,

1. prefixing $cur base directory - ~/tmp.
2. using standard bash completion routine _filedir used cd/ls etc.
3. removing ~/tmp compreply

just record: can use logic complete file names relative many other types of path, e.g.

1. i use complete perforce paths //....
2. you can complete http://localhost/* paths, relative public_html directory.