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51 lines
1.8 KiB
Go
51 lines
1.8 KiB
Go
// ================================================================
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// Wraps 'sh -c foo bar' or 'cmd /c foo bar', nominally for regression-testing.
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// ================================================================
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//go:build windows
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// +build windows
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package platform
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import (
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"os"
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)
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// PowerShell or CMD?
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//
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// * Either PowerShell or CMD is fine for everything except the '...' in inline
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// put/filter statements.
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//
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// * PowerShell allows fractionally more, e.g. in mlr put '$flag = $x > 10' CMD
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// sees the ">" as a file-redirect (before our main() is ever entered) and
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// PowerShell lets it be operator it is intended to be.
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//
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// * Neither of them allows multi-line '...' inputs.
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//
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// * Both of the previous mean that a large number of regression tests need to
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// use mlr -f .../cases/.../0047.mlr .../cases/.../0047.input and PowerShell
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// doesn't help us eliminate this.
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//
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// * PowerShell has about a 2-second startup time per invocation so if we
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// use it for regression testing, we'd have to move away from one shell
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// invocation per Miller invocation and back to batching lots of Miller
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// statements into a file, doing diff/findstr to check status. That was the
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// case for Miller's original bash/file regtest framework and it was hard to
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// debug.
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//
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// In conclusion, we stick with CMD because it's faster, and PowerShell while
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// more powerful isn't *sufficiently* more powerful to justify the
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// batching-complexity to overcome its startup-latency overhead.
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func GetShellRunArray(command string) []string {
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if os.Getenv("MSYSTEM") != "" {
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// Running inside MSYS2; sufficiently Unix-like already.
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return []string{"/bin/sh", "-c", command}
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} else {
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cmd := os.Getenv("COMSPEC")
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if cmd == "" {
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cmd = "C:\\Windows\\System32\\cmd.exe"
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}
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return []string{cmd, "/c", command}
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}
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}
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