shellcheck fails to parse tests when the comparator is a variable.

[derekschrock]

For bugs

• SC1073
• version: 0.10.0
• The rule's wiki page does not already cover this (e.g. https://shellcheck.net/wiki/SC2086)
• I tried on https://www.shellcheck.net/ and verified that this is still a problem on the latest commit

For new checks and feature suggestions

• https://www.shellcheck.net/ (i.e. the latest commit) currently gives no useful warnings about this
• I searched through https://github.com/koalaman/shellcheck/issues and didn't find anything related

Here's a snippet or screenshot that shows the problem:

#!/bin/sh

v1=1
v2=2

gt=">"
[ "$v1" $gt "$v2" ] || echo no
[ "$v2" $gt "$v1" ] && echo yes

gt="-gt"
[ "$v1" $gt "$v2" ] || echo no
[ "$v2" $gt "$v1" ] && echo yes

Here's what shellcheck currently says:

In test.sh line 9:
[ "$v1" $gt "$v2" ] || echo no
^-- SC1073 (error): Couldn't parse this test expression. Fix to allow more checks.
^-- SC1072 (error): Expected test to end here (don't wrap commands in []/[[]]). Fix any mentioned problems and try again.

Here's what I wanted or expected to see:

shellcheck to be able to handle the test where test is a var.