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# Inline matching method: --eval
# Matches the text output from an arbitrary shell command
# Run a simple command
$ folder=$(pwd)
$ echo $folder #=> --eval pwd
# Read the contents of a variable
$ var='abc'
$ echo abc #=> --eval echo $var
# Use arithmetic expansion
$ echo 4 #=> --eval echo $((2+2))
# Run a subshell
$ today=$(date +%D)
$ echo "Today is $today" #=> --eval echo "Today is $(date +%D)"
# You can also match lines without the final \n
$ printf 'ok' #=> --eval printf 'ok'
# Blanks are preserved
$ echo ' leading space' #=> --eval echo ' leading space'
$ echo ' leading spaces' #=> --eval echo ' leading spaces'
$ printf '\tleading tab\n' #=> --eval printf '\tleading tab\n'
$ printf '\t\tleading tabs\n' #=> --eval printf '\t\tleading tabs\n'
$ echo 'trailing space ' #=> --eval echo 'trailing space '
$ echo 'trailing spaces ' #=> --eval echo 'trailing spaces '
$ printf 'trailing tab\t\n' #=> --eval printf 'trailing tab\t\n'
$ printf 'trailing tabs\t\t\n' #=> --eval printf 'trailing tabs\t\t\n'
$ echo ' ' #=> --eval echo ' '
$ echo ' ' #=> --eval echo ' '
$ printf '\t\n' #=> --eval printf '\t\n'
$ printf '\t\t\t\n' #=> --eval printf '\t\t\t\n'
$ printf ' \t \t\t \n' #=> --eval printf ' \t \t\t \n'
# Syntax: Must be exactly one space before and after --eval
$ echo 'fail' #=> --eval fail with 2 spaces
$ echo 'fail' #=> --eval fail with tab
# Syntax: The space after --eval is required.
# When missing, the '--eval' is considered a normal text.
$ echo '--eval' #=> --eval
# Syntax: Make sure we won't catch partial matches.
$ echo '--evaluate' #=> --evaluate
# Syntax: To insert a literal text that begins with '--eval '
# just prefix it with --text.
$ echo '--eval is evil' #=> --text --eval is evil
# Syntax: Empty inline output contents are considered an error
# Note: Tested in separate files: inline-match-eval-error-?.sh
#
# $ echo 'no contents' #=> --eval
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