zshrc: Move minimal-shell to its own file

Signed-off-by: Frank Terbeck <ft@bewatermyfriend.org>

doc/grmlzshrc.t2t

@@ -569,10 +569,6 @@ Returns true, if run within an utf environment, else false.
 Creates directory including parent directories, if necessary. Then changes
 current working directory to it.
 
-: **minimal-shell()**
-Spawns a minimally set up MirBSD Korn shell. It references no files in /usr,
-so that file system can be unmounted.
-
 : **modified()**
 Lists files in current directory, which have been modified within the
 last N days. N is an integer to be passed as first and only argument.

etc/zsh/zshrc

@@ -2149,19 +2149,6 @@ deswap() {
     print 'Finished, running "swapoff -a; swapon -a" may also be useful.'
 }
 
-# spawn a minimally set up mksh - useful if you want to umount /usr/.
-minimal-shell() {
-    emulate -L zsh
-    local shell="/bin/mksh"
-
-    if [[ ! -x ${shell} ]]; then
-        printf '`%s'\'' not available, giving up.\n' ${shell} >&2
-        return 1
-    fi
-
-    exec env -i ENV="/etc/minimal-shellrc" HOME="$HOME" TERM="$TERM" ${shell}
-}
-
 # a wrapper for vim, that deals with title setting
 #   VIM_OPTIONS
 #       set this array to a set of options to vim you always want

usr_share_grml/zsh/functions/minimal-shell

@@ -0,0 +1,15 @@
+# spawn a minimally set up mksh - useful if you want to umount /usr/.
+emulate -L zsh
+
+local shell="/bin/mksh"
+local env_file="/etc/minimal-shellrc"
+
+if [[ ! -x ${shell} ]]; then
+    printf '`%s'\'' not available, giving up.\n' ${shell} >&2
+    return 1
+elif [[ ! -f ${env_file} ]]; then
+    printf 'minimal-shell: Configuration missing: `%s'\''\n' ${shell} >&2
+    return 2
+fi
+
+exec env -i ENV="$env_file" HOME="$HOME" TERM="$TERM" ${shell}