Bash-completion is written with FHS in mind where completion scripts
all get added to /usr/share/bash-completion/completions and are picked
up by the dynamic completion loader from there---whether they are
part of bash-completion or installed by another package.

On Guix systems, we want not only to search within bash-completion's own
directory, but also in the user's profile and in the system profile.
This is what this patch does.


--- a/bash_completion
+++ b/bash_completion
@@ -2016,7 +2016,13 @@ complete -F _minimal ''
 
 __load_completion()
 {
-    local -a dirs=( ${BASH_COMPLETION_USER_DIR:-${XDG_DATA_HOME:-$HOME/.local/share}/bash-completion}/completions )
+    local -a dirs=(
+        "$HOME/.guix-profile/share/bash-completion/completions/$base"
+        "$HOME/.guix-profile/etc/bash_completion.d/$base"
+        "/run/current-system/profile/share/bash-completion/completions/$base"
+        "/run/current-system/profile/etc/bash_completion.d/$base"
+        ${BASH_COMPLETION_USER_DIR:-${XDG_DATA_HOME:-$HOME/.local/share}/bash-completion}/completions )
+
     local OIFS=$IFS IFS=: dir cmd="${1##*/}" compfile
     for dir in ${XDG_DATA_DIRS:-/usr/local/share:/usr/share}; do
         dirs+=( $dir/bash-completion/completions )
uix/commit/TODO?id=52828db08352c16518769538b7923c803a9b87ec'>commit</a><a href='/guix/diff/TODO?id=52828db08352c16518769538b7923c803a9b87ec'>diff</a></td><td class='form'><form class='right' method='get' action='/guix/log/TODO'>
<input type='hidden' name='id' value='52828db08352c16518769538b7923c803a9b87ec'/><select name='qt'>
<option value='grep'>log msg</option>
<option value='author'>author</option>
<option value='committer'>committer</option>
<option value='range'>range</option>
</select>
<input class='txt' type='search' size='10' name='q' value=''/>
<input type='submit' value='search'/>
</form>
</td></tr></table>
<div class='path'>path: <a href='/guix/log/?id=52828db08352c16518769538b7923c803a9b87ec'>root</a>/<a href='/guix/log/TODO?id=52828db08352c16518769538b7923c803a9b87ec'>TODO</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/TODO?id=52828db08352c16518769538b7923c803a9b87ec&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2019-01-21 09:59:41 +0100'>2019-01-21</span></td><td><a href='/guix/commit/TODO?id=b93d2602f72dbbd9334a4f5c75b8721e1f2fa35a'>Update 'TODO'</a><span class='msg-avail'>...</span></td><td>Mathieu Othacehe</td></tr>
<tr><td><span title='2019-01-17 14:11:15 +0100'>2019-01-17</span></td><td><a href='/guix/commit/TODO?id=11b68c90cd89288906c595d5c31a0413ed8a496f'>Update 'TODO'.</a><span class='msg-avail'>...</span></td><td>Mathieu Othacehe</td></tr>