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Shell: Fix job control and backgrounding

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This patchset makes the shell capable of lazily resolving and executing
sequences of commands, to allow for putting logical sequences in the
background.
In particular, it enables And/Or/Sequence nodes to be run in the background,
and consequently unmarks them as `would_execute`.
Doing so also fixes job control to an extent, as jobs are now capable of
having 'tails', so sequences can be put in the background while
preserving their following sequences.
This commit is contained in:
AnotherTest 2020-09-01 08:42:16 +04:30 • committed by Andreas Kling
parent a2a54f459f
commit 715e11f692
10 changed files with 180 additions and 151 deletions
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54
Shell/Tests/valid.sh
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@ -23,69 +23,69 @@ test "$(echo yes)" = yes || exit 2
alias fail="echo Failure: "
# Redirections.
test -z "$(echo foo > /dev/null)" || fail direct path redirection
test -z "$(echo foo 2> /dev/null 1>&2)" || fail indirect redirection
test -n "$(echo foo 2> /dev/null)" || fail fds interfere with each other
test -z "$(echo foo > /dev/null)" || fail direct path redirection && exit 2
test -z "$(echo foo 2> /dev/null 1>&2)" || fail indirect redirection && exit 2
test -n "$(echo foo 2> /dev/null)" || fail fds interfere with each other && exit 2
# Argument unpack
test "$(echo (yes))" = yes || fail arguments inside bare lists
test "$(echo (no)() yes)" = yes || fail arguments inside juxtaposition: empty
test "$(echo (y)(es))" = yes || fail arguments inside juxtaposition: list
test "$(echo "y"es)" = yes || fail arguments inside juxtaposition: string
test "$(echo (yes))" = yes || fail arguments inside bare lists && exit 2
test "$(echo (no)() yes)" = yes || fail arguments inside juxtaposition: empty && exit 2
test "$(echo (y)(es))" = yes || fail arguments inside juxtaposition: list && exit 2
test "$(echo "y"es)" = yes || fail arguments inside juxtaposition: string && exit 2
# String substitution
foo=yes
test "$(echo $foo)" = yes || fail simple string var lookup
test "$(echo "$foo")" = yes || fail stringified string var lookup
test "$(echo $foo)" = yes || fail simple string var lookup && exit 2
test "$(echo "$foo")" = yes || fail stringified string var lookup && exit 2
# List substitution
foo=(yes)
# Static lookup, as list
test "$(echo $foo)" = yes || fail simple list var lookup
test "$(echo $foo)" = yes || fail simple list var lookup && exit 2
# Static lookup, stringified
test "$(echo "$foo")" = yes || fail stringified list var lookup
test "$(echo "$foo")" = yes || fail stringified list var lookup && exit 2
# Dynamic lookup through static expression
test "$(echo $'foo')" = yes || fail dynamic lookup through static exp
test "$(echo $'foo')" = yes || fail dynamic lookup through static exp && exit 2
# Dynamic lookup through dynamic expression
ref_to_foo=foo
test "$(echo $"$ref_to_foo")" = yes || fail dynamic lookup through dynamic exp
test "$(echo $"$ref_to_foo")" = yes || fail dynamic lookup through dynamic exp && exit 2
# More redirections
echo test > /tmp/sh-test
test "$(cat /tmp/sh-test)" = test || fail simple path redirect
test "$(cat /tmp/sh-test)" = test || fail simple path redirect && exit 2
rm /tmp/sh-test
# 'brace' expansions
test "$(echo x(yes no))" = "xyes xno" || fail simple juxtaposition expansion
test "$(echo (y n)(es o))" = "yes yo nes no" || fail list-list juxtaposition expansion
test "$(echo ()(foo bar baz))" = "" || fail empty expansion
test "$(echo x(yes no))" = "xyes xno" || fail simple juxtaposition expansion && exit 2
test "$(echo (y n)(es o))" = "yes yo nes no" || fail list-list juxtaposition expansion && exit 2
test "$(echo ()(foo bar baz))" = "" || fail empty expansion && exit 2
# Variables inside commands
to_devnull=(>/dev/null)
test "$(echo hewwo $to_devnull)" = "" || fail variable containing simple command
test "$(echo hewwo $to_devnull)" = "" || fail variable containing simple command && exit 2
word_count=(() | wc -w)
test "$(echo well hello friends $word_count)" -eq 3 || fail variable containing pipeline
test "$(echo well hello friends $word_count)" -eq 3 || fail variable containing pipeline && exit 2
# Globs
mkdir sh-test
pushd sh-test
touch (a b c)(d e f)
test "$(echo a*)" = "ad ae af" || fail '*' glob expansion
test "$(echo a?)" = "ad ae af" || fail '?' glob expansion
test "$(echo a*)" = "ad ae af" || fail '*' glob expansion && exit 2
test "$(echo a?)" = "ad ae af" || fail '?' glob expansion && exit 2
glob_in_var='*'
test "$(echo $glob_in_var)" = '*' || fail substituted string acts as glob
test "$(echo $glob_in_var)" = '*' || fail substituted string acts as glob && exit 2
test "$(echo (a*))" = "ad ae af" || fail globs in lists resolve wrong
test "$(echo x(a*))" = "xad xae xaf" || fail globs in lists do not resolve to lists
test "$(echo "foo"a*)" = "fooad fooae fooaf" || fail globs join to dquoted strings
test "$(echo (a*))" = "ad ae af" || fail globs in lists resolve wrong && exit 2
test "$(echo x(a*))" = "xad xae xaf" || fail globs in lists do not resolve to lists && exit 2
test "$(echo "foo"a*)" = "fooad fooae fooaf" || fail globs join to dquoted strings && exit 2
popd
rm -fr sh-test
# Setopt
setopt --inline_exec_keep_empty_segments
test "$(echo -n "a\n\nb")" = "a b" || fail inline_exec_keep_empty_segments has no effect
test "$(echo -n "a\n\nb")" = "a b" || fail inline_exec_keep_empty_segments has no effect && exit 2
setopt --no_inline_exec_keep_empty_segments
test "$(echo -n "a\n\nb")" = "a b" || fail cannot unset inline_exec_keep_empty_segments
test "$(echo -n "a\n\nb")" = "a b" || fail cannot unset inline_exec_keep_empty_segments && exit 2