Hi.
Passing arguments to programs on Windows is difficult at several points,
especially when you pass multiple arguments or *special character* at many many sides...
Vim side:
on Windows, when 'shellslash' option is set, shellescape() returns a string wrapped by single quotes which cmd.exe doesn't recognize.
So I implements a shellescape() function which is not affected by 'shellslash' option value.
https://github.com/vim-jp/vital.vim/blob/9159770df1ba4b7b63da7a20fa7906bf66f6ebe/autoload/vital/__latest__/Process.vim#L140-L148
Windows side:
Windows doesn't support multiple arguments by Win32API-level.
A system call to run a new process(CreateProcess()) only has one command-line parameter including a program name and arguments.
So a program must parse one concatenated argument to arguments.
But this process was done by startup routine automatically generated by compiler thus usually you don't concern about it (in C, startup routine is called before main()).
But there are two problems here:
1. There are programs that implements a startup routine by itself.
For example, cygwin's binary executables implements a startup routine by itself to parse UNIXy special characters like glob pattern ("*").
2. cmd.exe and CreateProcess()'s source code is closed.
Thus we can't see precise parsing process.
There are 3 important points to doubt when you debug:
cmd.exe -> CreateProcess() -> startup routine -> [a program accesses arguments ...]
Each processes parses arguments and may get wrong recognition there.
Conclusion:
Passing arguments to programs on Windows is too difficult ;(
There are no *right* way to pass arguments.
We always have to choose *mostly right* way...
Hello!
I have a plugin which uses `system(command, input)` to run some external commands. There seem to be a few escaping problems (mostly on Windows).
So I did some research and wrote it all up here: https://github.com/airblade/vim-system-escape
In a nutshell I'd like to write a VimL `shellescape(str)` function which gets the escaping right for all Vim versions greater than, say, 7.0. I.e. implement the current built-in escaping logic in VimL.
And maybe have a similar function which escapes the whole command passed to `system(command)`...though I'm not sure yet whether that's necessary.
Anyway, I'd be most grateful for suggestions and/or feedback on my notes at the link above.
Thanks in advance,
Andy Stewart
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