bug#73650: 31.0.50; [PATCH] Improve correctness of Eshell conditional forms and allow if/else chaining

[Jim Porter]

These patches improve a few inconsistencies in how Eshell conditionals 
work, especially when using Lisp forms inside of the command-form of 
"if". For example, before this patch, the following command outputs 
nothing at all:

  if (zerop 0) (identity \"yes\") (identity \"no\")

With the patches, it now correctly outputs "yes".

I also added the ability to use the "else" keyword so that you can chain 
together if/else blocks like so:

  if {[ -f file.txt ]} {
    echo found file
  } else if {[ -f alternate.txt ]} {
    echo found alternate
  } else {
    echo not found!
  }

0001-Simplify-creation-of-Eshell-command-forms.patch
Description: Text document

0002-Improve-correctness-of-Eshell-sub-forms.patch
Description: Text document

0003-Add-support-for-chaining-conditionals-in-Eshell.patch
Description: Text document