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# spec/append.test.sh: Test += |
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|
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#### Append string to string |
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s='abc' |
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s+=d |
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echo $s |
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## stdout: abcd |
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|
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#### Append array to array |
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a=(x y ) |
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a+=(t 'u v') |
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argv.py "${a[@]}" |
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## stdout: ['x', 'y', 't', 'u v'] |
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|
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#### Append string to undefined variable |
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|
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s+=foo |
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echo s=$s |
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|
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# bash and mksh agree that this does NOT respect set -u. |
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# I think that's a mistake, but += is a legacy construct, so let's copy it. |
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|
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set -u |
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|
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t+=foo |
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echo t=$t |
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t+=foo |
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echo t=$t |
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## STDOUT: |
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s=foo |
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t=foo |
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t=foofoo |
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## END |
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|
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#### Append to array to undefined variable |
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|
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## TODO: strict_array could get rid of this? |
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y+=(c d) |
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argv.py "${y[@]}" |
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## STDOUT: |
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['c', 'd'] |
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## END |
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|
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#### error: s+=(my array) |
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s='abc' |
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s+=(d e f) |
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echo $s |
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## status: 1 |
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## stdout-json: "" |
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## BUG bash/mksh status: 0 |
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## BUG bash/mksh stdout: abc |
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## OK zsh status: 0 |
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## OK zsh stdout: abc d e f |
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|
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#### error: myarray+=s |
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|
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# They treat this as implicit index 0. We disallow this on the LHS, so we will |
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# also disallow it on the RHS. |
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a=(x y ) |
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a+=z |
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argv.py "${a[@]}" |
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## status: 1 |
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## stdout-json: "" |
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## OK bash/mksh status: 0 |
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## OK bash/mksh stdout: ['xz', 'y'] |
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## OK zsh status: 0 |
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## OK zsh stdout: ['x', 'y', 'z'] |
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|
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#### typeset s+=(my array) -- compat_array |
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typeset s='abc' |
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echo $s |
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|
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typeset s+=(d e f) |
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echo status=$? |
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argv.py "${s[@]}" |
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|
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## status: 1 |
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## STDOUT: |
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abc |
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## END |
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## OK bash status: 0 |
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## OK bash STDOUT: |
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abc |
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status=0 |
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['abc', 'd', 'e', 'f'] |
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## END |
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|
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#### error: typeset myarray+=s |
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typeset a=(x y) |
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argv.py "${a[@]}" |
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typeset a+=s |
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argv.py "${a[@]}" |
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|
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## status: 1 |
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## STDOUT: |
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['x', 'y'] |
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## END |
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## BUG bash status: 0 |
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## BUG bash STDOUT: |
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['x', 'y'] |
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['xs', 'y'] |
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## END |
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## N-I mksh STDOUT: |
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## END |
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|
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#### error: append used like env prefix |
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# This should be an error in other shells but it's not. |
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A=a |
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A+=a printenv.py A |
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## status: 2 |
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## BUG bash/zsh status: 0 |
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## BUG bash/zsh stdout: aa |
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## BUG mksh status: 0 |
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## BUG mksh stdout: a |
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|
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#### myarray[1]+=s - Append to element |
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# They treat this as implicit index 0. We disallow this on the LHS, so we will |
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# also disallow it on the RHS. |
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a=(x y ) |
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a[1]+=z |
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argv.py "${a[@]}" |
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## status: 0 |
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## stdout: ['x', 'yz'] |
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## BUG zsh stdout: ['xz', 'y'] |
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|
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#### myarray[-1]+=s - Append to last element |
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# Works in bash, but not mksh. It seems like bash is doing the right thing. |
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# a[-1] is allowed on the LHS. mksh doesn't have negative indexing? |
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a=(1 '2 3') |
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a[-1]+=' 4' |
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argv.py "${a[@]}" |
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## stdout: ['1', '2 3 4'] |
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## BUG mksh stdout: ['1', '2 3', ' 4'] |
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|
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#### Try to append list to element |
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# bash - runtime error: cannot assign list to array number |
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# mksh - a[-1]+: is not an identifier |
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# osh - parse error -- could be better! |
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a=(1 '2 3') |
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a[-1]+=(4 5) |
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argv.py "${a[@]}" |
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## OK bash STDOUT: |
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['1', '2 3'] |
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## END |
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## OK bash status: 0 |
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## N-I mksh stdout-json: "" |
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## N-I mksh status: 1 |
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## OK stdout-json: "" |
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## OK osh status: 2 |
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|
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#### Strings have value semantics, not reference semantics |
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s1='abc' |
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s2=$s1 |
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s1+='d' |
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echo $s1 $s2 |
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## stdout: abcd abc |
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|
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#### typeset s+= |
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|
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typeset s+=foo |
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echo s=$s |
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|
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# bash and mksh agree that this does NOT respect set -u. |
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# I think that's a mistake, but += is a legacy construct, so let's copy it. |
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|
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set -u |
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|
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typeset t+=foo |
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echo t=$t |
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typeset t+=foo |
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echo t=$t |
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## STDOUT: |
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s=foo |
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t=foo |
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t=foofoo |
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## END |
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## N-I zsh status: 1 |
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## N-I zsh stdout-json: "" |
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|
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#### typeset s${dyn}+= |
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|
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dyn=x |
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|
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typeset s${dyn}+=foo |
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echo sx=$sx |
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|
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# bash and mksh agree that this does NOT respect set -u. |
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# I think that's a mistake, but += is a legacy construct, so let's copy it. |
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|
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set -u |
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|
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typeset t${dyn}+=foo |
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echo tx=$tx |
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typeset t${dyn}+=foo |
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echo tx=$tx |
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## STDOUT: |
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sx=foo |
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tx=foo |
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tx=foofoo |
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## END |
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## N-I zsh status: 1 |
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## N-I zsh stdout-json: "" |
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|
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#### export readonly += |
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|
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export e+=foo |
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echo e=$e |
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|
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readonly r+=bar |
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echo r=$r |
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|
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set -u |
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|
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export e+=foo |
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echo e=$e |
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|
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#readonly r+=foo |
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#echo r=$e |
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|
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## STDOUT: |
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e=foo |
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r=bar |
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e=foofoo |
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## END |
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## N-I zsh status: 1 |
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## N-I zsh stdout-json: "" |
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|
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#### local += |
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|
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f() { |
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local s+=foo |
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echo s=$s |
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|
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set -u |
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local s+=foo |
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echo s=$s |
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} |
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|
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f |
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## STDOUT: |
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s=foo |
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s=foofoo |
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## END |
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## N-I zsh status: 1 |
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## N-I zsh stdout-json: "" |
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|
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#### assign builtin appending array: declare d+=(d e) |
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|
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declare d+=(d e) |
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echo "${d[@]}" |
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declare d+=(c l) |
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echo "${d[@]}" |
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|
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readonly r+=(r e) |
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echo "${r[@]}" |
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# can't do this again |
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|
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f() { |
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local l+=(l o) |
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echo "${l[@]}" |
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|
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local l+=(c a) |
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echo "${l[@]}" |
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} |
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|
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f |
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|
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## STDOUT: |
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d e |
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d e c l |
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r e |
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l o |
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l o c a |
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## END |
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## N-I mksh status: 1 |
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## N-I mksh stdout-json: "" |
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## N-I zsh status: 1 |
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## N-I zsh stdout-json: "" |
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|
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#### export+=array disallowed |
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|
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export e+=(e x) |
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echo "${e[@]}" |
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|
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## status: 1 |
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## STDOUT: |
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## END |
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## BUG bash status: 0 |
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## BUG bash STDOUT: |
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e x |
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## END |