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104 lines
2.9 KiB
Go
104 lines
2.9 KiB
Go
package oscommands
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import (
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"fmt"
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"os"
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"os/exec"
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"strings"
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"github.com/mgutz/str"
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)
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type ICmdObjBuilder interface {
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// NewFromArgs takes a slice of strings like []string{"git", "commit"} and returns a new command object.
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New(args []string) ICmdObj
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// NewShell takes a string like `git commit` and returns an executable shell command for it e.g. `sh -c 'git commit'`
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// shellFunctionsFile is an optional file path that will be sourced before executing the command. Callers should pass
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// the value of UserConfig.OS.ShellFunctionsFile.
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NewShell(commandStr string, shellFunctionsFile string) ICmdObj
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// Quote wraps a string in quotes with any necessary escaping applied. The reason for bundling this up with the other methods in this interface is that we basically always need to make use of this when creating new command objects.
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Quote(str string) string
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}
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type CmdObjBuilder struct {
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runner ICmdObjRunner
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platform *Platform
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}
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// poor man's version of explicitly saying that struct X implements interface Y
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var _ ICmdObjBuilder = &CmdObjBuilder{}
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func (self *CmdObjBuilder) New(args []string) ICmdObj {
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cmdObj := self.NewWithEnviron(args, os.Environ())
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return cmdObj
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}
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// A command with explicit environment from env
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func (self *CmdObjBuilder) NewWithEnviron(args []string, env []string) ICmdObj {
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cmd := exec.Command(args[0], args[1:]...)
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cmd.Env = env
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return &CmdObj{
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cmd: cmd,
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runner: self.runner,
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}
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}
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func (self *CmdObjBuilder) NewShell(commandStr string, shellFunctionsFile string) ICmdObj {
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if len(shellFunctionsFile) > 0 {
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commandStr = fmt.Sprintf("%ssource %s\n%s", self.platform.PrefixForShellFunctionsFile, shellFunctionsFile, commandStr)
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}
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quotedCommand := self.quotedCommandString(commandStr)
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cmdArgs := str.ToArgv(fmt.Sprintf("%s %s %s", self.platform.Shell, self.platform.ShellArg, quotedCommand))
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return self.New(cmdArgs)
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}
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func (self *CmdObjBuilder) quotedCommandString(commandStr string) string {
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// Windows does not seem to like quotes around the command
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if self.platform.OS == "windows" {
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return strings.NewReplacer(
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"^", "^^",
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"&", "^&",
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"|", "^|",
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"<", "^<",
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">", "^>",
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"%", "^%",
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).Replace(commandStr)
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}
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return self.Quote(commandStr)
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}
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func (self *CmdObjBuilder) CloneWithNewRunner(decorate func(ICmdObjRunner) ICmdObjRunner) *CmdObjBuilder {
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decoratedRunner := decorate(self.runner)
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return &CmdObjBuilder{
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runner: decoratedRunner,
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platform: self.platform,
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}
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}
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const CHARS_REQUIRING_QUOTES = "\"\\$` "
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// If you update this method, be sure to update CHARS_REQUIRING_QUOTES
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func (self *CmdObjBuilder) Quote(message string) string {
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var quote string
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if self.platform.OS == "windows" {
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quote = `\"`
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message = strings.NewReplacer(
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`"`, `"'"'"`,
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`\"`, `\\"`,
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).Replace(message)
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} else {
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quote = `"`
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message = strings.NewReplacer(
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`\`, `\\`,
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`"`, `\"`,
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`$`, `\$`,
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"`", "\\`",
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).Replace(message)
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}
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return quote + message + quote
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}
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