Add convenience builder for git commands

pkg/commands/git_commands/git_command_builder.go

@@ -0,0 +1,54 @@
+package git_commands
+
+import "strings"
+
+// convenience struct for building git commands. Especially useful when
+// including conditional args
+type GitCommandBuilder struct {
+	// command string
+	args []string
+}
+
+func NewGitCmd(command string) *GitCommandBuilder {
+	return &GitCommandBuilder{args: []string{command}}
+}
+
+func (self *GitCommandBuilder) Arg(args ...string) *GitCommandBuilder {
+	self.args = append(self.args, args...)
+
+	return self
+}
+
+func (self *GitCommandBuilder) ArgIf(condition bool, ifTrue ...string) *GitCommandBuilder {
+	if condition {
+		self.Arg(ifTrue...)
+	}
+
+	return self
+}
+
+func (self *GitCommandBuilder) ArgIfElse(condition bool, ifTrue string, ifFalse string) *GitCommandBuilder {
+	if condition {
+		return self.Arg(ifTrue)
+	} else {
+		return self.Arg(ifFalse)
+	}
+}
+
+func (self *GitCommandBuilder) Config(value string) *GitCommandBuilder {
+	// config settings come before the command
+	self.args = append([]string{"-c", value}, self.args...)
+
+	return self
+}
+
+func (self *GitCommandBuilder) RepoPath(value string) *GitCommandBuilder {
+	// repo path comes before the command
+	self.args = append([]string{"-C", value}, self.args...)
+
+	return self
+}
+
+func (self *GitCommandBuilder) ToString() string {
+	return "git " + strings.Join(self.args, " ")
+}