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dbracket.test.sh
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dbracket.test.sh
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#!/usr/bin/env bash
#### [[ glob matching, [[ has no glob expansion
[[ foo.py == *.py ]] && echo true
[[ foo.p == *.py ]] || echo false
## stdout-json: "true\nfalse\n"
#### [[ glob matching with escapes
[[ 'foo.*' == *."*" ]] && echo true
# note that the pattern arg to fnmatch should be '*.\*'
## stdout: true
#### equality
[[ '*.py' == '*.py' ]] && echo true
[[ foo.py == '*.py' ]] || echo false
## stdout-json: "true\nfalse\n"
#### [[ glob matching with unquoted var
pat=*.py
[[ foo.py == $pat ]] && echo true
[[ foo.p == $pat ]] || echo false
## stdout-json: "true\nfalse\n"
#### [[ regex matching
# mksh doesn't have this syntax of regex matching. I guess it comes from perl?
regex='.*\.py'
[[ foo.py =~ $regex ]] && echo true
[[ foo.p =~ $regex ]] || echo false
## stdout-json: "true\nfalse\n"
## N-I mksh stdout-json: ""
## N-I mksh status: 1
#### [[ regex syntax error
# hm, it doesn't show any error, but it exits 2.
[[ foo.py =~ * ]] && echo true
## status: 2
## N-I mksh status: 1
#### [[ has no word splitting
var='one two'
[[ 'one two' == $var ]] && echo true
## stdout: true
#### [[ has quote joining
var='one two'
[[ 'one 'tw"o" == $var ]] && echo true
## stdout: true
#### [[ empty string is false
[[ 'a' ]] && echo true
[[ '' ]] || echo false
## stdout-json: "true\nfalse\n"
#### && chain
[[ t && t && '' ]] || echo false
## stdout: false
#### || chain
[[ '' || '' || t ]] && echo true
## stdout: true
#### [[ compound expressions
# Notes on whitespace:
# - 1 and == need space seprating them, but ! and ( don't.
# - [[ needs whitesapce after it, but ]] doesn't need whitespace before it!
[[ ''||! (1 == 2)&&(2 == 2)]] && echo true
## stdout: true
# NOTE on the two cases below. We're comparing
# (a || b) && c vs. a || (b && c)
#
# a = true, b = false, c = false is an example where they are different.
# && and || have precedence inside
#### precedence of && and || inside [[
[[ True || '' && '' ]] && echo true
## stdout: true
#### precedence of && and || in a command context
if test True || test '' && test ''; then
echo YES
else
echo "NO precedence"
fi
## stdout: NO precedence
# http://tldp.org/LDP/abs/html/testconstructs.html#DBLBRACKETS
#### Octal literals with -eq
shopt -u strict-arith || true
decimal=15
octal=017 # = 15 (decimal)
[[ $decimal -eq $octal ]] && echo true
[[ $decimal -eq ZZZ$octal ]] || echo false
## STDOUT:
true
false
## END
## N-I mksh stdout: false
# mksh doesn't implement this syntax for literals.
#### Hex literals with -eq
shopt -u strict-arith || true
decimal=15
hex=0x0f # = 15 (decimal)
[[ $decimal -eq $hex ]] && echo true
[[ $decimal -eq ZZZ$hex ]] || echo false
## stdout-json: "true\nfalse\n"
## N-I mksh stdout: false
# TODO: Add tests for this
# https://www.gnu.org/software/bash/manual/bash.html#Bash-Conditional-Expressions
# When used with [[, the ‘<’ and ‘>’ operators sort lexicographically using the
# current locale. The test command uses ASCII ordering.
#### > on strings
# NOTE: < doesn't need space, even though == does? That's silly.
[[ b>a ]] && echo true
[[ b<a ]] || echo false
## stdout-json: "true\nfalse\n"
#### != on strings
# NOTE: b!=a does NOT work
[[ b != a ]] && echo true
[[ a != a ]] || echo false
## stdout-json: "true\nfalse\n"
#### -eq on strings
# This is lame behavior: it does a conversion to 0 first for any string
shopt -u strict-arith || true
[[ a -eq a ]] && echo true
[[ a -eq b ]] && echo true
## STDOUT:
true
true
## END
#### [[ compare with literal -f (compare with test-builtin.test.sh)
var=-f
[[ $var == -f ]] && echo true
[[ '-f' == $var ]] && echo true
## stdout-json: "true\ntrue\n"
#### [[ with op variable (compare with test-builtin.test.sh)
# Parse error -- parsed BEFORE evaluation of vars
op='=='
[[ a $op a ]] && echo true
[[ a $op b ]] || echo false
## status: 2
## OK mksh status: 1
#### [[ with unquoted empty var (compare with test-builtin.test.sh)
empty=''
[[ $empty == '' ]] && echo true
## stdout: true
#### [[ at runtime doesn't work
dbracket=[[
$dbracket foo == foo ]]
## status: 127
#### [[ with env prefix doesn't work
FOO=bar [[ foo == foo ]]
## status: 127
#### [[ over multiple lines is OK
# Hm it seems you can't split anywhere?
[[ foo == foo
&& bar == bar
]] && echo true
## status: 0
## STDOUT:
true
## END
#### Argument that looks like a command word operator
[[ -f -f ]] || echo false
[[ -f == ]] || echo false
## STDOUT:
false
false
## END
#### Argument that looks like a real operator
[[ -f < ]] && echo 'should be parse error'
## status: 2
## OK mksh status: 1
#### User array compared to "$@" (broken unless shopt -s strict-array)
# Both are coerced to string! It treats it more like an UNQUOTED ${a[@]}.
a=('1 3' 5)
b=(1 2 3)
set -- 1 '3 5'
[[ "$@" = "${a[@]}" ]] && echo true
[[ "$@" = "${b[@]}" ]] || echo false
## STDOUT:
true
false
## END
#### Array coerces to string (shopt -s strict-array to disallow)
a=('1 3' 5)
[[ '1 3 5' = "${a[@]}" ]] && echo true
[[ '1 3 4' = "${a[@]}" ]] || echo false
## STDOUT:
true
false
## END
#### (( array1 == array2 )) doesn't work
a=('1 3' 5)
b=('1 3' 5)
c=('1' '3 5')
d=('1' '3 6')
# shells EXPAND a and b first
(( a == b ))
echo status=$?
(( a == c ))
echo status=$?
(( a == d ))
echo status=$?
## stdout-json: ""
## status: 1
## BUG bash STDOUT:
status=1
status=1
status=1
## END
## BUG bash status: 0
#### Quotes don't matter in comparison
[[ '3' = 3 ]] && echo true
[[ '3' -eq 3 ]] && echo true
## STDOUT:
true
true
## END
#### -eq does dynamic arithmetic parsing (not supported in OSH)
[[ 1+2 -eq 3 ]] && echo true
expr='1+2'
[[ $expr -eq 3 ]] && echo true # must be dynamically parsed
## STDOUT:
true
true
## END
## N-I osh stdout-json: ""
## N-I osh status: 1
#### -eq coercion produces weird results
shopt -u strict-arith || true
[[ '' -eq 0 ]] && echo true
## stdout: true
#### [[ '(' ]] is treated as literal
[[ '(' ]]
echo status=$?
## stdout: status=0
#### [[ '(' foo ]] is syntax error
[[ '(' foo ]]
echo status=$?
## status: 2
## OK mksh status: 1
#### empty ! is treated as literal
[[ '!' ]]
echo status=$?
## stdout: status=0
#### [[ -z ]] is syntax error
[[ -z ]]
echo status=$?
## status: 2
## OK mksh status: 1
#### [[ -z '>' ]]
[[ -z '>' ]] || echo false # -z is operator
## stdout: false
#### [[ -z '>' a ]] is syntax error
[[ -z '>' -- ]]
echo status=$?
## status: 2
## OK mksh status: 1
#### test whether ']]' is empty
[[ ']]' ]]
echo status=$?
## status: 0
#### [[ ]] is syntax error
[[ ]]
echo status=$?
## stdout-json: ""
## status: 2
## OK mksh status: 1
#### [[ && ]] is syntax error
[[ && ]]
echo status=$?
## stdout-json: ""
## status: 2
## OK mksh status: 1
#### [[ a 3< b ]] doesn't work (bug regression)
[[ a 3< b ]]
echo status=$?
[[ a 3> b ]]
echo status=$?
## status: 2
# Hm these shells use the same redirect trick that OSH used to!
## BUG mksh/zsh status: 0
## BUG mksh/zsh STDOUT:
status=0
status=1
## END
#### tilde expansion in [[
HOME=/home/bob
[[ ~ == /home/bob ]]
echo status=$?
[[ ~ == */bob ]]
echo status=$?
[[ ~ == */z ]]
echo status=$?
## STDOUT:
status=0
status=0
status=1
## END