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// Copyright 2015 Canonical Ltd.
// Licensed under the LGPLv3, see LICENCE file for details.
package shell
import (
"runtime"
"strings"
"github.com/juju/errors"
"github.com/juju/utils"
"github.com/juju/utils/filepath"
)
// A PathRenderer generates paths that are appropriate for a given
// shell environment.
type PathRenderer interface {
filepath.Renderer
// Quote generates a new string with quotation marks and relevant
// escape/control characters properly escaped. The resulting string
// is wrapped in quotation marks such that it will be treated as a
// single string by the shell.
Quote(str string) string
// ExeSuffix returns the filename suffix for executable files.
ExeSuffix() string
}
// Renderer provides all the functionality needed to generate shell-
// compatible paths and commands.
type Renderer interface {
PathRenderer
CommandRenderer
OutputRenderer
}
// NewRenderer returns a Renderer for the given shell, OS, or distro name.
func NewRenderer(name string) (Renderer, error) {
if name == "" {
name = runtime.GOOS
} else {
name = strings.ToLower(name)
}
// Try known shell names first.
switch name {
case "bash":
return &BashRenderer{}, nil
case "ps", "powershell":
return &PowershellRenderer{}, nil
case "cmd", "batch", "bat":
return &WinCmdRenderer{}, nil
}
// Fall back to operating systems.
switch {
case name == "windows":
return &PowershellRenderer{}, nil
case utils.OSIsUnix(name):
return &BashRenderer{}, nil
}
// Finally try distros.
switch name {
case "ubuntu":
return &BashRenderer{}, nil
}
return nil, errors.NotFoundf("renderer for %q", name)
}
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