Best effort dependency resolution

Add a new check_install function that checks if a tool is installed and
tries to install it on a best effort basic. Modify all scripts that
benefit from it. Small indentation and correctness fixes.

	modified:   functions/7za.fish
	modified:   functions/alert.fish
	new file:   functions/check_install.fish
	modified:   functions/lscmd.fish
	modified:   functions/rchmod.fish
	modified:   functions/renlow.fish
	modified:   functions/rlsxattr.fish
	modified:   functions/rsdos.fish
	modified:   functions/rsmac.fish
	modified:   functions/rsxattr.fish
	modified:   functions/uz.fish

1 files changed, 0 insertions, 5 deletions

diff --git a/functions/renlow.fish b/functions/renlow.fish
index 98b0e4c..1581550 100644
--- a/functions/renlow.fish
+++ b/functions/renlow.fish
@@ -1,10 +1,5 @@
 function renlow --description 'Rename all files and directories with lowercase characters'
 
-if not command -sq 'find'
-  echo "Can't find find."
-  return 1  
-end
-
 for file in (find . -type f)
   set -l element (string split -r -m1 / $file)
   mv $file $element[1]/(string lower $element[2])