Functions/New-GitBranch.ps1

# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

function New-GitBranch {
    <#
    .SYNOPSIS

    Creates a new branch in a Git repository.

    .DESCRIPTION

    The `New-GitBranch` creates a new branch in a Git repository and then switches to (i.e. checks out) that branch.

    It defaults to the current repository. Use the `RepoRoot` parameter to specify an explicit path to another repo.

    This function implements the `git branch <branchname> <startpoint>` and `git checkout <branchname>` commands.

    .EXAMPLE

    New-GitBranch -RepoRoot 'C:\Projects\PowerGit' -Name 'develop'

    Demonstrates how to create a new branch named 'develop' in the specified repository.

    .EXAMPLE

    New-GitBranch -Name 'develop

    Demonstrates how to create a new branch named 'develop' in the current directory.
    #>

    [CmdletBinding()]
    [OutputType([LibGit2Sharp.Branch])]
    param(
        # Specifies which git repository to add a branch to. Defaults to the current directory.
        [string] $RepoRoot = (Get-Location).ProviderPath,

        # The name of the new branch.
        [Parameter(Mandatory, Position = 0)]
        [string] $Name,

        # The revision where the branch should be started/created. A revision can be a specific commit ID/sha (short or long), branch name, tag name, etc. Run git help gitrevisions or go to https://git-scm.com/docs/gitrevisions for full documentation on Git's revision syntax.
        [string] $Revision = "HEAD"
    )

    Set-StrictMode -Version 'Latest'

    $repo = Find-GitRepository -Path $RepoRoot -Verify
    if (-not $repo) {
        return
    }

    try {
        if (Test-GitBranch -RepoRoot $RepoRoot -Name $Name) {
            Write-Error ('Branch {0} already exists in repository {1}' -f $Name, $RepoRoot)
            return
        }

        $newBranch = $repo.Branches.Add($Name, $Revision)
        $checkoutOptions = [LibGit2Sharp.CheckoutOptions]::new()
        [LibGit2Sharp.Commands]::Checkout($repo, $newBranch, $checkoutOptions)
    } catch [LibGit2Sharp.LibGit2SharpException] {
        Write-Error ("Could not create branch '{0}' from invalid starting point: '{1}'" -f $Name, $Revision)
    }
}