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745129e825
fish-shell/tests/checks/string.fish
Johannes Altmanninger 745129e825 builtin string: don't print final newline if it's missing from stdin 
A command like "printf nonewline | sed s/x/y/" does not print a
concluding newline, whereas "printf nnl | string replace x y" does.
This is an edge case -- usually the user input does have a newline at
the end -- but it seems still better for this command to just forward
the user's data.

Teach most string subcommands to check if stdin is missing the trailing
newline, and stop adding one in that case.
This does not apply when input is read from commandline arguments.

* Most subcommands stop adding the final newline, because they don't
  really care about newlines, so besides their normal processing,
  they just want to preserve user input. They are:
  * string collect
  * string escape/unescape
  * string join¹
  * string lower/upper
  * string pad
  * string replace
  * string repeat
  * string sub
  * string trim

* string match keeps adding the newline, following "grep". Additionally,
  for string match --regex, it's important to output capture groups
  separated by newlines, resulting in multiple output lines for an
  input line. So it is not obvious where to leave out the newline.

* string split/split0 keep adding the newline for the same reason --
  they are meant to output multiple elements for a single input line.

¹) string join0 is not changed because it already printed a trailing
   zero byte instead of the trailing newline. This is consistent
   with other tools like "find -print0".

Closes #3847
2021-11-27 19:11:24 +01:00

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#RUN: %fish %s
# Tests for string builtin. Mostly taken from man page examples.
string match -r -v "c.*" dog can cat diz; and echo "exit 0"
# CHECK: dog
# CHECK: diz
# CHECK: exit 0
string match -q -r -v "c.*" dog can cat diz; and echo "exit 0"
# CHECK: exit 0
string match -v "c*" dog can cat diz; and echo "exit 0"
# CHECK: dog
# CHECK: diz
# CHECK: exit 0
string match -q -v "c*" dog can cat diz; and echo "exit 0"
# CHECK: exit 0
string match -v "d*" dog dan dat diz; or echo "exit 1"
# CHECK: exit 1
string match -q -v "d*" dog dan dat diz; or echo "exit 1"
# CHECK: exit 1
string match -r -v x y; and echo "exit 0"
# CHECK: y
# CHECK: exit 0
string match -r -v x x; or echo "exit 1"
# CHECK: exit 1
string match -q -r -v x y; and echo "exit 0"
# CHECK: exit 0
string match -q -r -v x x; or echo "exit 1"
# CHECK: exit 1
string length "hello, world"
# CHECK: 12
string length -q ""; and echo not zero length; or echo zero length
# CHECK: zero length
string pad foo
# CHECK: foo
string pad -r -w 7 -c - foo
# CHECK: foo----
string pad --width 7 -c '=' foo
# CHECK: ====foo
echo \|(string pad --width 10 --right foo)\|
# CHECK: |foo |
begin
set -l fish_emoji_width 2
# Pad string with multi-width emoji.
string pad -w 4 -c . 🐟
# CHECK: ..🐟
# Pad with multi-width character.
string pad -w 3 -c 🐟 .
# CHECK: 🐟.
# Multi-width pad with remainder, complemented with a space.
string pad -w 4 -c 🐟 . ..
# CHECK: 🐟 .
# CHECK: 🐟..
end
# Pad to the maximum length.
string pad -c . long longer longest
# CHECK: ...long
# CHECK: .longer
# CHECK: longest
# This tests current behavior where the max width of an argument overrules
# the width parameter. This could be changed if needed.
string pad -c_ --width 5 longer-than-width-param x
# CHECK: longer-than-width-param
# CHECK: ______________________x
# Current behavior is that only a single padding character is supported.
# We can support longer strings in future without breaking compatibilty.
string pad -c ab -w4 .
# CHECKERR: string pad: Padding should be a character 'ab'
# Visible length. Let's start off simple, colors are ignored:
string length --visible (set_color red)abc
# CHECK: 3
begin
set -l fish_emoji_width 2
# This should print the emoji width
string length --visible . 🥁
# CHECK: 1
# CHECK: 2
set -l fish_emoji_width 1
string length --visible . 🥁
# CHECK: 1
# CHECK: 1
end
# Only the longest run between carriage returns is kept because the rest is overwritten.
string length --visible (set_color normal)abcdef\rfooba(set_color red)raaa
# (foobaraaa)
# CHECK: 9
# Visible length is *always* split by line
string length --visible a(set_color blue)b\ncde
# CHECK: 2
# CHECK: 3
# Backslashes and visible length:
# It can't move us before the start of the line.
string length --visible \b
# CHECK: 0
# It can't move us before the start of the line.
string length --visible \bf
# CHECK: 1
# But it does erase chars before.
string length --visible \bf\b
# CHECK: 0
# Never move past 0.
string length --visible \bf\b\b\b\b\b
# CHECK: 0
string sub --length 2 abcde
# CHECK: ab
string sub -s 2 -l 2 abcde
# CHECK: bc
string sub --start=-2 abcde
# CHECK: de
string sub --end=3 abcde
# CHECK: abc
string sub --end=-4 abcde
# CHECK: a
string sub --start=2 --end=-2 abcde
# CHECK: bc
string sub -s -5 -e -2 abcdefgh
# CHECK: def
string sub -s -100 -e -2 abcde
# CHECK: abc
string sub -s -5 -e 2 abcde
# CHECK: ab
string sub -s -50 -e -100 abcde
# CHECK:
string sub -s 2 -e -5 abcde
# CHECK:
string split . example.com
# CHECK: example
# CHECK: com
string split -r -m1 / /usr/local/bin/fish
# CHECK: /usr/local/bin
# CHECK: fish
string split "" abc
# CHECK: a
# CHECK: b
# CHECK: c
string split --fields=2 "" abc
# CHECK: b
string split --fields=3,2 "" abc
# CHECK: c
# CHECK: b
string split --fields=2,9 "" abc; or echo "exit 1"
# CHECK: exit 1
string split --fields=1-3,5,9-7 "" 123456789
# CHECK: 1
# CHECK: 2
# CHECK: 3
# CHECK: 5
# CHECK: 9
# CHECK: 8
# CHECK: 7
string split -f1 ' ' 'a b' 'c d'
# CHECK: a
# CHECK: c
string split --allow-empty --fields=2,9 "" abc
# CHECK: b
seq 3 | string join ...
# CHECK: 1...2...3
string trim " abc "
# CHECK: abc
string trim --right --chars=yz xyzzy zany
# CHECK: x
# CHECK: zan
echo \x07 | string escape
# CHECK: \cg
string escape --style=script 'a b#c"\'d'
# CHECK: a\ b\#c\"\'d
string escape --style=url 'a b#c"\'d'
# CHECK: a%20b%23c%22%27d
string escape --style=url \na\nb%c~d\n
# CHECK: %0Aa%0Ab%25c~d%0A
string escape --style=var 'a b#c"\'d'
# CHECK: a_20_b_23_c_22_27_d
string escape --style=var a\nghi_
# CHECK: a_0A_ghi__
string escape --style=var abc
# CHECK: abc
string escape --style=var _a_b_c_
# CHECK: __a__b__c__
string escape --style=var -- -
# CHECK: _2D_
# string escape with multibyte chars
string escape --style=url aöb
string escape --style=url 中
string escape --style=url aöb | string unescape --style=url
string escape --style=url 中 | string unescape --style=url
string escape --style=var aöb
string escape --style=var 中
string escape --style=var aöb | string unescape --style=var
string escape --style=var 中 | string unescape --style=var
# CHECK: a%C3%B6b
# CHECK: %E4%B8%AD
# CHECK: aöb
# CHECK: 中
# CHECK: a_C3_B6_b
# CHECK: _E4_B8_AD_
# CHECK: aöb
# CHECK: 中
# test regex escaping
string escape --style=regex ".ext"
string escape --style=regex "bonjour, amigo"
string escape --style=regex "^this is a literal string"
# CHECK: \.ext
# CHECK: bonjour, amigo
# CHECK: \^this is a literal string
### Verify that we can correctly unescape the same strings
# we tested escaping above.
set x (string unescape (echo \x07 | string escape))
test $x = \x07
and echo success
# CHECK: success
string unescape --style=script (string escape --style=script 'a b#c"\'d')
# CHECK: a b#c"'d
string unescape --style=url (string escape --style=url 'a b#c"\'d')
# CHECK: a b#c"'d
string unescape --style=url (string escape --style=url \na\nb%c~d\n)
# CHECK:
# CHECK: a
# CHECK: b%c~d
string unescape --style=var (string escape --style=var 'a b#c"\'d')
# CHECK: a b#c"'d
string unescape --style=var (string escape --style=var a\nghi_)
# CHECK: a
# CHECK: ghi_
string unescape --style=var (string escape --style=var 'abc')
# CHECK: abc
string unescape --style=var (string escape --style=var '_a_b_c_')
# CHECK: _a_b_c_
string unescape --style=var -- (string escape --style=var -- -)
# CHECK: -
### Verify that we can correctly match strings.
string match "*" a
# CHECK: a
string match "a*b" axxb
# CHECK: axxb
string match -i "a**B" Axxb
# CHECK: Axxb
echo "ok?" | string match "*?"
# CHECK: ok?
string match -r "cat|dog|fish" "nice dog"
# CHECK: dog
string match -r "(\d\d?):(\d\d):(\d\d)" 2:34:56
# CHECK: 2:34:56
# CHECK: 2
# CHECK: 34
# CHECK: 56
string match -r "^(\w{2,4})\g1\$" papa mud murmur
# CHECK: papa
# CHECK: pa
# CHECK: murmur
# CHECK: mur
string match -r -a -n at ratatat
# CHECK: 2 2
# CHECK: 4 2
# CHECK: 6 2
string match -r -i "0x[0-9a-f]{1,8}" "int magic = 0xBadC0de;"
# CHECK: 0xBadC0de
string replace is was "blue is my favorite"
# CHECK: blue was my favorite
string replace 3rd last 1st 2nd 3rd
# CHECK: 1st
# CHECK: 2nd
# CHECK: last
string replace -a " " _ "spaces to underscores"
# CHECK: spaces_to_underscores
string replace -r -a "[^\d.]+" " " "0 one two 3.14 four 5x"
# CHECK: 0 3.14 5
string replace -r "(\w+)\s+(\w+)" "\$2 \$1 \$\$" "left right"
# CHECK: right left $
string replace -r "\s*newline\s*" "\n" "put a newline here"
# CHECK: put a
# CHECK: here
string replace -r -a "(\w)" "\$1\$1" ab
# CHECK: aabb
string replace --filter x X abc axc x def jkx
or echo Unexpected exit status at line (status --current-line-number)
# CHECK: aXc
# CHECK: X
# CHECK: jkX
string replace --filter y Y abc axc x def jkx
and echo Unexpected exit status at line (status --current-line-number)
string replace --regex -f "\d" X 1bc axc 2 d3f jk4 xyz
or echo Unexpected exit status at line (status --current-line-number)
# CHECK: Xbc
# CHECK: X
# CHECK: dXf
# CHECK: jkX
string replace --regex -f Z X 1bc axc 2 d3f jk4 xyz
and echo Unexpected exit status at line (status --current-line-number)
# From https://github.com/fish-shell/fish-shell/issues/5201
# 'string match -r with empty capture groups'
string match -r '^([ugoa]*)([=+-]?)([rwx]*)$' '=r'
#CHECK: =r
#CHECK:
#CHECK: =
#CHECK: r
### Test some failure cases
string match -r "[" "a[sd"; and echo "unexpected exit 0"
# CHECKERR: string match: Regular expression compile error: missing terminating ] for character class
# CHECKERR: string match: [
# CHECKERR: string match: ^
# FIXME: This prints usage summary?
#string invalidarg; and echo "unexpected exit 0"
# DONTCHECKERR: string: Subcommand 'invalidarg' is not valid
string length; or echo "missing argument returns 1"
# CHECK: missing argument returns 1
string match -r -v "[dcantg].*" dog can cat diz; or echo "no regexp invert match"
# CHECK: no regexp invert match
string match -v "*" dog can cat diz; or echo "no glob invert match"
# CHECK: no glob invert match
string match -rvn a bbb; or echo "exit 1"
# CHECK: 1 3
### Test repeat subcommand
string repeat -n 2 foo
# CHECK: foofoo
string repeat --count 2 foo
# CHECK: foofoo
echo foo | string repeat -n 2
# CHECK: foofoo
string repeat -n2 -q foo; and echo "exit 0"
# CHECK: exit 0
string repeat -n2 --quiet foo; and echo "exit 0"
# CHECK: exit 0
string repeat -n0 foo; or echo "exit 1"
# CHECK: exit 1
string repeat -n0; or echo "exit 1"
# CHECK: exit 1
string repeat -m0; or echo "exit 1"
# CHECK: exit 1
string repeat -n1 -N "there is "
echo "no newline"
# CHECK: there is no newline
string repeat -n1 --no-newline "there is "
echo "no newline"
# CHECK: there is no newline
string repeat -n10 -m4 foo
# CHECK: foof
string repeat -n10 --max 5 foo
# CHECK: foofo
string repeat -n3 -m20 foo
# CHECK: foofoofoo
string repeat -m4 foo
# CHECK: foof
string repeat -n 5 a b c
# CHECK: aaaaa
# CHECK: bbbbb
# CHECK: ccccc
string repeat -n 5 --max 4 123 456 789
# CHECK: 1231
# CHECK: 4564
# CHECK: 7897
string repeat -n 5 --max 4 123 '' 789
# CHECK: 1231
# CHECK:
# CHECK: 7897
# Historical string repeat behavior is no newline if no output.
echo -n before
string repeat -n 5 ''
echo after
# CHECK: beforeafter
string repeat -n-1 foo; and echo "exit 0"
# CHECKERR: string repeat: Invalid count value '-1'
string repeat -m-1 foo; and echo "exit 0"
# CHECKERR: string repeat: Invalid max value '-1'
string repeat -n notanumber foo; and echo "exit 0"
# CHECKERR: string repeat: notanumber: invalid integer
string repeat -m notanumber foo; and echo "exit 0"
# CHECKERR: string repeat: notanumber: invalid integer
echo stdin | string repeat -n1 "and arg"; and echo "exit 0"
# CHECKERR: string repeat: too many arguments
string repeat -n; and echo "exit 0"
# CHECKERR: string repeat: -n: option requires an argument
# FIXME: Also triggers usage
# string repeat -l fakearg
# DONTCHECKERR: string repeat: Unknown option '-l'
string repeat ""
or echo string repeat empty string failed
# CHECK: string repeat empty string failed
string repeat -n3 ""
or echo string repeat empty string failed
# CHECK: string repeat empty string failed
# Test equivalent matches with/without the --entire, --regex, and --invert flags.
string match -e x abc dxf xyz jkx x z
or echo exit 1
# CHECK: dxf
# CHECK: xyz
# CHECK: jkx
# CHECK: x
string match x abc dxf xyz jkx x z
# CHECK: x
string match --entire -r "a*b[xy]+" abc abxc bye aaabyz kaabxz abbxy abcx caabxyxz
or echo exit 1
# CHECK: abxc
# CHECK: bye
# CHECK: aaabyz
# CHECK: kaabxz
# CHECK: abbxy
# CHECK: caabxyxz
# 'string match --entire "" -- banana'
string match --entire "" -- banana
or echo exit 1
# CHECK: banana
# 'string match -r "a*b[xy]+" abc abxc bye aaabyz kaabxz abbxy abcx caabxyxz'
string match -r "a*b[xy]+" abc abxc bye aaabyz kaabxz abbxy abcx caabxyxz
or echo exit 1
# CHECK: abx
# CHECK: by
# CHECK: aaaby
# CHECK: aabx
# CHECK: bxy
# CHECK: aabxyx
# Make sure that groups are handled correct with/without --entire.
# 'string match --entire -r "a*b([xy]+)" abc abxc bye aaabyz kaabxz abbxy abcx caabxyxz'
string match --entire -r "a*b([xy]+)" abc abxc bye aaabyz kaabxz abbxy abcx caabxyxz
or echo exit 1
# CHECK: abxc
# CHECK: x
# CHECK: bye
# CHECK: y
# CHECK: aaabyz
# CHECK: y
# CHECK: kaabxz
# CHECK: x
# CHECK: abbxy
# CHECK: xy
# CHECK: caabxyxz
# CHECK: xyx
# 'string match -r "a*b([xy]+)" abc abxc bye aaabyz kaabxz abbxy abcx caabxyxz'
string match -r "a*b([xy]+)" abc abxc bye aaabyz kaabxz abbxy abcx caabxyxz
or echo exit 1
# CHECK: abx
# CHECK: x
# CHECK: by
# CHECK: y
# CHECK: aaaby
# CHECK: y
# CHECK: aabx
# CHECK: x
# CHECK: bxy
# CHECK: xy
# CHECK: aabxyx
# CHECK: xyx
# Test `string lower` and `string upper`.
set x (string lower abc DEF gHi)
or echo string lower exit 1
test $x[1] = abc -a $x[2] = def -a $x[3] = ghi
or echo strings not converted to lowercase
set x (echo abc DEF gHi | string lower)
or echo string lower exit 1
test $x[1] = 'abc def ghi'
or echo strings not converted to lowercase
string lower -q abc
and echo lowercasing a lowercase string did not fail as expected
set x (string upper abc DEF gHi)
or echo string upper exit 1
test $x[1] = ABC -a $x[2] = DEF -a $x[3] = GHI
or echo strings not converted to uppercase
set x (echo abc DEF gHi | string upper)
or echo string upper exit 1
test $x[1] = 'ABC DEF GHI'
or echo strings not converted to uppercase
string upper -q ABC DEF
and echo uppercasing a uppercase string did not fail as expected
# 'Check NUL'
# Note: We do `string escape` at the end to make a `\0` literal visible.
printf 'a\0b\n' | string escape
printf 'a\0c\n' | string match -e a | string escape
printf 'a\0d\n' | string split '' | string escape
printf 'a\0b\n' | string match -r '.*b$' | string escape
printf 'a\0b\n' | string replace b g | string escape
printf 'a\0b\n' | string replace -r b g | string escape
# TODO: These do not yet work!
# printf 'a\0b' | string match '*b' | string escape
# CHECK: a\x00b
# CHECK: a\x00c
# CHECK: a
# CHECK: \x00
# CHECK: d
# CHECK: a\x00b
# CHECK: a\x00g
# CHECK: a\x00g
# string split0
count (echo -ne 'abcdefghi' | string split0)
# CHECK: 1
count (echo -ne 'abc\x00def\x00ghi\x00' | string split0)
# CHECK: 3
count (echo -ne 'abc\x00def\x00ghi\x00\x00' | string split0)
# CHECK: 4
count (echo -ne 'abc\x00def\x00ghi' | string split0)
# CHECK: 3
count (echo -ne 'abc\ndef\x00ghi\x00' | string split0)
# CHECK: 2
count (echo -ne 'abc\ndef\nghi' | string split0)
# CHECK: 1
# #5701 - split0 always returned 1
echo -ne 'a\x00b' | string split0
and echo Split something
# CHECK: a
# CHECK: b
# CHECK: Split something
# string join0
set tmp beta alpha\ngamma
count (string join \n $tmp)
# CHECK: 3
count (string join0 $tmp)
# CHECK: 2
count (string join0 $tmp | string split0)
# CHECK: 2
# string split0 in functions
# This function outputs some newline-separated content, and some
# explicitly separated content.
function dualsplit
echo alpha
echo beta
echo -ne 'gamma\x00delta' | string split0
end
count (dualsplit)
# CHECK: 4
# Ensure we handle empty outputs correctly (#5987)
count (string split / /)
# CHECK: 2
count (echo -ne '\x00\x00\x00' | string split0)
# CHECK: 3
# string collect
count (echo one\ntwo\nthree\nfour | string collect)
count (echo one | string collect)
# CHECK: 1
# CHECK: 1
echo [(echo one\ntwo\nthree | string collect)]
# CHECK: [one
# CHECK: two
# CHECK: three]
echo [(echo one\ntwo\nthree | string collect -N)]
# CHECK: [one
# CHECK: two
# CHECK: three
# CHECK: ]
printf '[%s]\n' (string collect one\n\n two\n)
# CHECK: [one]
# CHECK: [two]
printf '[%s]\n' (string collect -N one\n\n two\n)
# CHECK: [one
# CHECK:
# CHECK: ]
# CHECK: [two
# CHECK: ]
printf '[%s]\n' (string collect --no-trim-newlines one\n\n two\n)
# CHECK: [one
# CHECK:
# CHECK: ]
# CHECK: [two
# CHECK: ]
# string collect returns 0 when it has any output, otherwise 1
string collect >/dev/null; and echo unexpected success; or echo expected failure
# CHECK: expected failure
echo -n | string collect >/dev/null; and echo unexpected success; or echo expected failure
# CHECK: expected failure
echo | string collect -N >/dev/null; and echo expected success; or echo unexpected failure
# CHECK: expected success
echo | string collect >/dev/null; and echo unexpected success; or echo expected failure
# CHECK: expected failure
string collect a >/dev/null; and echo expected success; or echo unexpected failure
# CHECK: expected success
string collect -N '' >/dev/null; and echo unexpected success; or echo expected failure
# CHECK: expected failure
string collect \n\n >/dev/null; and echo unexpected success; or echo expected failure
# CHECK: expected failure
echo "foo"(true | string collect --allow-empty)"bar"
# CHECK: foobar
test -z (string collect)
and echo Nothing
# CHECK: Nothing
test -n (string collect)
and echo Something
# CHECK: Something
test -n (string collect -a)
or echo No, actually nothing
# CHECK: No, actually nothing
# string collect in functions
# This function outputs some newline-separated content, and some
# explicitly un-separated content.
function dualcollect
echo alpha
echo beta
echo gamma\ndelta\nomega | string collect
end
count (dualcollect)
# CHECK: 3
string match -qer asd asd
echo $status
# CHECK: 0
string match -eq asd asd
echo $status
# CHECK: 0
# Unmatched capturing groups are treated as empty
echo az | string replace -r -- 'a(b.+)?z' 'a:$1z'
# CHECK: a:z
# --quiet should quit early
echo "Checking that --quiet quits early - if this is broken it hangs"
# CHECK: Checking that --quiet quits early - if this is broken it hangs
yes | string match -q y
echo $status
# CHECK: 0
yes | string length -q
echo $status
# CHECK: 0
yes | string replace -q y n
echo $status
# CHECK: 0
# `string` can't be wrapped properly anymore, since `string match` creates variables:
function string
builtin string $argv
end
# CHECKERR: checks/string.fish (line {{\d+}}): function: string: cannot use reserved keyword as function name
# CHECKERR: function string
# CHECKERR: ^
string escape \x7F
# CHECK: \x7f
# This used to crash.
string pad -w 8 he \eh
# CHECK: he
# CHECK: {{\x1bh}}
string match -rg '(.*)fish' catfish
# CHECK: cat
string match -rg '(.*)fish' shellfish
# CHECK: shell
# An empty match
string match -rg '(.*)fish' fish
# No match at all
string match -rg '(.*)fish' banana
# Make sure it doesn't start matching something
string match -r --groups-only '(.+)fish' fish
echo $status
# CHECK: 1
# Multiple groups
string match -r --groups-only '(.+)fish(.*)' catfishcolor
# CHECK: cat
# CHECK: color
# Examples specifically called out in #6056.
echo "foo bar baz" | string match -rg 'foo (bar) baz'
# CHECK: bar
echo "foo1x foo2x foo3x" | string match -arg 'foo(\d)x'
# CHECK: 1
# CHECK: 2
# CHECK: 3
# Most subcommands preserve missing newline (#3847).
echo -n abc | string upper
echo '<eol>'
# CHECK: ABC<eol>
printf \<
printf my-password | string replace -ra . \*
printf \>\n
# CHECK: <***********>
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