[vim/vim] Vim9: cannot set '*expr' option to autoload import (Issue #9584)

lacygoill

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Jan 21, 2022, 9:23:00 AM1/21/22

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Steps to reproduce

Run this shell command:

vim -Nu NONE -S <(tee <<'EOF'
    vim9script
    var lines =<< trim END
        # first

        aaa
        aaa
        aaa

        # second

        bbb
        bbb
        bbb

        # third

        ccc
        ccc
        ccc
    END
    var file = '/tmp/file'
    lines->writefile(file)
    execute 'noswapfile edit ' .. file

    var dir = '/tmp/.vim'
    &runtimepath = dir
    dir ..= '/autoload'
    dir->mkdir('p')
    lines =<< trim END
        vim9script
        export def Expr(): string
            return getline(v:lnum) =~ '^#' ? '>1' : '1'
        enddef
    END
    lines->writefile(dir .. '/fold.vim')

    import autoload 'fold.vim'
    &foldexpr = 'fold.Expr()'
    &foldmethod = 'expr'
    &debug = 'throw'
EOF
)

E121 is given 17 times (i.e. once for each line in the buffer):

E121: Undefined variable: fold

The lines are not folded.

Expected behavior

No error is given. The lines are folded.

Version of Vim

8.2 Included patches: 1-4171

Environment

Operating system: Ubuntu 20.04.3 LTS
Terminal: xterm
Value of $TERM: xterm-256color
Shell: zsh 5.8

Additional context

If we replace this line:

&foldexpr = 'fold.Expr()'

With this line:

&foldexpr = 'fold#Expr()'

The issue disappears:

vim9script
var lines =<< trim END
    # first

    aaa
    aaa
    aaa

    # second

    bbb
    bbb
    bbb

    # third

    ccc
    ccc
    ccc
END
var file = '/tmp/file'
lines->writefile(file)
execute 'noswapfile edit ' .. file

var dir = '/tmp/.vim'
&runtimepath = dir
dir ..= '/autoload'
dir->mkdir('p')
lines =<< trim END
    vim9script
    export def Expr(): string
        return getline(v:lnum) =~ '^#' ? '>1' : '1'
    enddef
END
lines->writefile(dir .. '/fold.vim')

import autoload 'fold.vim'
&foldexpr = 'fold#Expr()'
&foldmethod = 'expr'
&debug = 'throw'

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Bram Moolenaar

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Jan 21, 2022, 10:26:51 AM1/21/22

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More generally, the expression cannot access anything in the script file.
A good solution appears to be that the expression is evaluated in the context of the script where the option was set.
I don't think this will have backwards compatibility problems, previously the expression could be evaluated anywhere.

This probably also applies to other "expr" options, but let's do 'foldexpr' first.

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Bram Moolenaar

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Jan 21, 2022, 11:32:11 AM1/21/22

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Closed #9584 via e70dd11.

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