feat(scripts): optional single-segment branch prefix for gitflow

extensions/git/scripts/bash/git-common.sh

@@ -11,10 +11,22 @@ has_git() {
         git -C "$repo_root" rev-parse --is-inside-work-tree >/dev/null 2>&1
 }
 
+# Strip a single optional path segment (e.g. gitflow "feat/004-name" -> "004-name").
+# Only when the full name is exactly two slash-free segments; otherwise returns the raw name.
+spec_kit_effective_branch_name() {
+    local raw="$1"
+    if [[ "$raw" =~ ^([^/]+)/([^/]+)$ ]]; then
+        printf '%s\n' "${BASH_REMATCH[2]}"
+    else
+        printf '%s\n' "$raw"
+    fi
+}
+
 # Validate that a branch name matches the expected feature branch pattern.
 # Accepts sequential (###-* with >=3 digits) or timestamp (YYYYMMDD-HHMMSS-*) formats.
+# Logic aligned with scripts/bash/common.sh check_feature_branch after effective-name normalization.
 check_feature_branch() {
-    local branch="$1"
+    local raw="$1"
     local has_git_repo="$2"
 
     # For non-git repos, we can't enforce branch naming but still provide output
@@ -23,19 +35,20 @@ check_feature_branch() {
         return 0
     fi
 
-    # Reject malformed timestamps (7-digit date, 8-digit date without trailing slug, or 7-digit with slug)
-    if [[ "$branch" =~ ^[0-9]{7}-[0-9]{6} ]] || [[ "$branch" =~ ^[0-9]{8}-[0-9]{6}$ ]]; then
-        echo "ERROR: Not on a feature branch. Current branch: $branch" >&2
-        echo "Feature branches should be named like: 001-feature-name or 20260319-143022-feature-name" >&2
-        return 1
-    fi
+    local branch
+    branch=$(spec_kit_effective_branch_name "$raw")
 
-    # Accept sequential (>=3 digits followed by hyphen) or timestamp (YYYYMMDD-HHMMSS-*)
-    if [[ "$branch" =~ ^[0-9]{3,}- ]] || [[ "$branch" =~ ^[0-9]{8}-[0-9]{6}- ]]; then
-        return 0
+    # Accept sequential prefix (3+ digits) but exclude malformed timestamps
+    # Malformed: 7-or-8 digit date + 6-digit time with no trailing slug (e.g. "2026031-143022" or "20260319-143022")
+    local is_sequential=false
+    if [[ "$branch" =~ ^[0-9]{3,}- ]] && [[ ! "$branch" =~ ^[0-9]{7}-[0-9]{6}- ]] && [[ ! "$branch" =~ ^[0-9]{7,8}-[0-9]{6}$ ]]; then
+        is_sequential=true
+    fi
+    if [[ "$is_sequential" != "true" ]] && [[ ! "$branch" =~ ^[0-9]{8}-[0-9]{6}- ]]; then
+        echo "ERROR: Not on a feature branch. Current branch: $raw" >&2
+        echo "Feature branches should be named like: 001-feature-name, 1234-feature-name, or 20260319-143022-feature-name" >&2
+        return 1
     fi
 
-    echo "ERROR: Not on a feature branch. Current branch: $branch" >&2
-    echo "Feature branches should be named like: 001-feature-name or 20260319-143022-feature-name" >&2
-    return 1
+    return 0
 }

extensions/git/scripts/powershell/git-common.ps1

@@ -15,6 +15,14 @@ function Test-HasGit {
     }
 }
 
+function Get-SpecKitEffectiveBranchName {
+    param([string]$Branch)
+    if ($Branch -match '^([^/]+)/([^/]+)$') {
+        return $Matches[2]
+    }
+    return $Branch
+}
+
 function Test-FeatureBranch {
     param(
         [string]$Branch,
@@ -27,24 +35,17 @@ function Test-FeatureBranch {
         return $true
     }
 
-    # Reject malformed timestamps (7-digit date or no trailing slug)
-    $hasMalformedTimestamp = ($Branch -match '^[0-9]{7}-[0-9]{6}-') -or
-                            ($Branch -match '^(?:\d{7}|\d{8})-\d{6}$')
-    if ($hasMalformedTimestamp) {
-        Write-Output "ERROR: Not on a feature branch. Current branch: $Branch"
-        Write-Output "Feature branches should be named like: 001-feature-name or 20260319-143022-feature-name"
-        return $false
-    }
+    $raw = $Branch
+    $Branch = Get-SpecKitEffectiveBranchName $raw
 
-    # Accept sequential (>=3 digits followed by hyphen) or timestamp (YYYYMMDD-HHMMSS-*)
+    # Accept sequential prefix (3+ digits) but exclude malformed timestamps
+    # Malformed: 7-or-8 digit date + 6-digit time with no trailing slug (e.g. "2026031-143022" or "20260319-143022")
+    $hasMalformedTimestamp = ($Branch -match '^[0-9]{7}-[0-9]{6}-') -or ($Branch -match '^(?:\d{7}|\d{8})-\d{6}$')
     $isSequential = ($Branch -match '^[0-9]{3,}-') -and (-not $hasMalformedTimestamp)
-    $isTimestamp = $Branch -match '^\d{8}-\d{6}-'
-
-    if ($isSequential -or $isTimestamp) {
-        return $true
+    if (-not $isSequential -and $Branch -notmatch '^\d{8}-\d{6}-') {
+        Write-Output "ERROR: Not on a feature branch. Current branch: $raw"
+        Write-Output "Feature branches should be named like: 001-feature-name, 1234-feature-name, or 20260319-143022-feature-name"
+        return $false
     }
-
-    Write-Output "ERROR: Not on a feature branch. Current branch: $Branch"
-    Write-Output "Feature branches should be named like: 001-feature-name or 20260319-143022-feature-name"
-    return $false
+    return $true
 }

scripts/bash/common.sh

@@ -114,8 +114,19 @@ has_git() {
     git -C "$repo_root" rev-parse --is-inside-work-tree >/dev/null 2>&1
 }
 
+# Strip a single optional path segment (e.g. gitflow "feat/004-name" -> "004-name").
+# Only when the full name is exactly two slash-free segments; otherwise returns the raw name.
+spec_kit_effective_branch_name() {
+    local raw="$1"
+    if [[ "$raw" =~ ^([^/]+)/([^/]+)$ ]]; then
+        printf '%s\n' "${BASH_REMATCH[2]}"
+    else
+        printf '%s\n' "$raw"
+    fi
+}
+
 check_feature_branch() {
-    local branch="$1"
+    local raw="$1"
     local has_git_repo="$2"
 
     # For non-git repos, we can't enforce branch naming but still provide output
@@ -124,28 +135,30 @@ check_feature_branch() {
         return 0
     fi
 
+    local branch
+    branch=$(spec_kit_effective_branch_name "$raw")
+
     # Accept sequential prefix (3+ digits) but exclude malformed timestamps
     # Malformed: 7-or-8 digit date + 6-digit time with no trailing slug (e.g. "2026031-143022" or "20260319-143022")
     local is_sequential=false
     if [[ "$branch" =~ ^[0-9]{3,}- ]] && [[ ! "$branch" =~ ^[0-9]{7}-[0-9]{6}- ]] && [[ ! "$branch" =~ ^[0-9]{7,8}-[0-9]{6}$ ]]; then
         is_sequential=true
     fi
     if [[ "$is_sequential" != "true" ]] && [[ ! "$branch" =~ ^[0-9]{8}-[0-9]{6}- ]]; then
-        echo "ERROR: Not on a feature branch. Current branch: $branch" >&2
+        echo "ERROR: Not on a feature branch. Current branch: $raw" >&2
         echo "Feature branches should be named like: 001-feature-name, 1234-feature-name, or 20260319-143022-feature-name" >&2
         return 1
     fi
 
     return 0
 }
 
-get_feature_dir() { echo "$1/specs/$2"; }
-
 # Find feature directory by numeric prefix instead of exact branch match
 # This allows multiple branches to work on the same spec (e.g., 004-fix-bug, 004-add-feature)
 find_feature_dir_by_prefix() {
     local repo_root="$1"
-    local branch_name="$2"
+    local branch_name
+    branch_name=$(spec_kit_effective_branch_name "$2")
     local specs_dir="$repo_root/specs"
 
     # Extract prefix from branch (e.g., "004" from "004-whatever" or "20260319-143022" from timestamp branches)

scripts/powershell/common.ps1

@@ -127,6 +127,16 @@ function Test-HasGit {
     }
 }
 
+# Strip a single optional path segment (e.g. gitflow "feat/004-name" -> "004-name").
+# Only when the full name is exactly two slash-free segments; otherwise returns the raw name.
+function Get-SpecKitEffectiveBranchName {
+    param([string]$Branch)
+    if ($Branch -match '^([^/]+)/([^/]+)$') {
+        return $Matches[2]
+    }
+    return $Branch
+}
+
 function Test-FeatureBranch {
     param(
         [string]$Branch,
@@ -138,22 +148,57 @@ function Test-FeatureBranch {
         Write-Warning "[specify] Warning: Git repository not detected; skipped branch validation"
         return $true
     }
+
+    $raw = $Branch
+    $Branch = Get-SpecKitEffectiveBranchName $raw
 
     # Accept sequential prefix (3+ digits) but exclude malformed timestamps
     # Malformed: 7-or-8 digit date + 6-digit time with no trailing slug (e.g. "2026031-143022" or "20260319-143022")
     $hasMalformedTimestamp = ($Branch -match '^[0-9]{7}-[0-9]{6}-') -or ($Branch -match '^(?:\d{7}|\d{8})-\d{6}$')
     $isSequential = ($Branch -match '^[0-9]{3,}-') -and (-not $hasMalformedTimestamp)
     if (-not $isSequential -and $Branch -notmatch '^\d{8}-\d{6}-') {
-        Write-Output "ERROR: Not on a feature branch. Current branch: $Branch"
+        Write-Output "ERROR: Not on a feature branch. Current branch: $raw"
         Write-Output "Feature branches should be named like: 001-feature-name, 1234-feature-name, or 20260319-143022-feature-name"
         return $false
     }
     return $true
 }
 
-function Get-FeatureDir {
-    param([string]$RepoRoot, [string]$Branch)
-    Join-Path $RepoRoot "specs/$Branch"
+# Resolve specs/<feature-dir> by numeric/timestamp prefix (mirrors scripts/bash/common.sh find_feature_dir_by_prefix).
+function Find-FeatureDirByPrefix {
+    param(
+        [Parameter(Mandatory = $true)][string]$RepoRoot,
+        [Parameter(Mandatory = $true)][string]$Branch
+    )
+    $specsDir = Join-Path $RepoRoot 'specs'
+    $branchName = Get-SpecKitEffectiveBranchName $Branch
+
+    $prefix = $null
+    if ($branchName -match '^(\d{8}-\d{6})-') {
+        $prefix = $Matches[1]
+    } elseif ($branchName -match '^(\d{3,})-') {
+        $prefix = $Matches[1]
+    } else {
+        return (Join-Path $specsDir $branchName)
+    }
+
+    $dirMatches = @()
+    if (Test-Path -LiteralPath $specsDir -PathType Container) {
+        $escaped = [regex]::Escape($prefix)
+        $dirMatches = @(Get-ChildItem -LiteralPath $specsDir -Directory -ErrorAction SilentlyContinue |
+            Where-Object { $_.Name -match "^$escaped-" })
+    }
+
+    if ($dirMatches.Count -eq 0) {
+        return (Join-Path $specsDir $branchName)
+    }
+    if ($dirMatches.Count -eq 1) {
+        return $dirMatches[0].FullName
+    }
+    $names = ($dirMatches | ForEach-Object { $_.Name }) -join ' '
+    Write-Output "ERROR: Multiple spec directories found with prefix '$prefix': $names"
+    Write-Output "Please ensure only one spec directory exists per prefix."
+    throw "Multiple spec directories for prefix '$prefix'"
 }
 
 function Get-FeaturePathsEnv {
@@ -164,7 +209,7 @@ function Get-FeaturePathsEnv {
     # Resolve feature directory.  Priority:
     #   1. SPECIFY_FEATURE_DIRECTORY env var (explicit override)
     #   2. .specify/feature.json "feature_directory" key (persisted by /speckit.specify)
-    #   3. Exact branch-to-directory mapping via Get-FeatureDir (legacy fallback)
+    #   3. Branch-name-based prefix lookup (same as scripts/bash/common.sh)
     $featureJson = Join-Path $repoRoot '.specify/feature.json'
     if ($env:SPECIFY_FEATURE_DIRECTORY) {
         $featureDir = $env:SPECIFY_FEATURE_DIRECTORY
@@ -182,13 +227,13 @@ function Get-FeaturePathsEnv {
                     $featureDir = Join-Path $repoRoot $featureDir
                 }
             } else {
-                $featureDir = Get-FeatureDir -RepoRoot $repoRoot -Branch $currentBranch
+                $featureDir = Find-FeatureDirByPrefix -RepoRoot $repoRoot -Branch $currentBranch
             }
         } catch {
-            $featureDir = Get-FeatureDir -RepoRoot $repoRoot -Branch $currentBranch
+            $featureDir = Find-FeatureDirByPrefix -RepoRoot $repoRoot -Branch $currentBranch
         }
     } else {
-        $featureDir = Get-FeatureDir -RepoRoot $repoRoot -Branch $currentBranch
+        $featureDir = Find-FeatureDirByPrefix -RepoRoot $repoRoot -Branch $currentBranch
     }
 
     [PSCustomObject]@{

tests/extensions/git/test_git_extension.py

@@ -587,3 +587,40 @@ def test_check_feature_branch_rejects_malformed_timestamp(self, tmp_path: Path):
             capture_output=True, text=True,
         )
         assert result.returncode != 0
+
+    def test_check_feature_branch_accepts_single_prefix(self, tmp_path: Path):
+        """git-common check_feature_branch matches core: one optional path prefix."""
+        project = _setup_project(tmp_path)
+        script = project / ".specify" / "extensions" / "git" / "scripts" / "bash" / "git-common.sh"
+        result = subprocess.run(
+            ["bash", "-c", f'source "{script}" && check_feature_branch "feat/001-my-feature" "true"'],
+            capture_output=True, text=True,
+        )
+        assert result.returncode == 0
+
+    def test_check_feature_branch_rejects_nested_prefix(self, tmp_path: Path):
+        project = _setup_project(tmp_path)
+        script = project / ".specify" / "extensions" / "git" / "scripts" / "bash" / "git-common.sh"
+        result = subprocess.run(
+            ["bash", "-c", f'source "{script}" && check_feature_branch "feat/fix/001-x" "true"'],
+            capture_output=True, text=True,
+        )
+        assert result.returncode != 0
+
+
+@pytest.mark.skipif(not HAS_PWSH, reason="pwsh not available")
+class TestGitCommonPowerShell:
+    def test_test_feature_branch_accepts_single_prefix(self, tmp_path: Path):
+        project = _setup_project(tmp_path)
+        script = project / ".specify" / "extensions" / "git" / "scripts" / "powershell" / "git-common.ps1"
+        result = subprocess.run(
+            [
+                "pwsh",
+                "-NoProfile",
+                "-Command",
+                f'. "{script}"; if (Test-FeatureBranch -Branch "feat/001-x" -HasGit $true) {{ exit 0 }} else {{ exit 1 }}',
+            ],
+            capture_output=True,
+            text=True,
+        )
+        assert result.returncode == 0