feat(shell): add fish support to common

scripts/fish/common.fish

@@ -0,0 +1,169 @@
+#!/usr/bin/env fish
+# Common functions and variables for all Fish shell scripts
+
+# Get repository root, with fallback for non-git repositories
+function get_repo_root
+    if git rev-parse --show-toplevel 2>/dev/null
+        return 0
+    else
+        # Fall back to script location for non-git repos
+        set script_dir (dirname (status --current-filename))
+        cd $script_dir/../../.. && pwd
+    end
+end
+
+# Get current branch, with fallback for non-git repositories
+function get_current_branch
+    # First check if SPECIFY_FEATURE environment variable is set
+    if set -q SPECIFY_FEATURE; and test -n "$SPECIFY_FEATURE"
+        echo $SPECIFY_FEATURE
+        return
+    end
+
+    # Then check git if available
+    if git rev-parse --abbrev-ref HEAD 2>/dev/null
+        return
+    end
+
+    # For non-git repos, try to find the latest feature directory
+    set repo_root (get_repo_root)
+    set specs_dir "$repo_root/specs"
+
+    if test -d "$specs_dir"
+        set latest_feature ""
+        set highest 0
+
+        for dir in $specs_dir/*
+            if test -d "$dir"
+                set dirname (basename $dir)
+                if string match -qr '^([0-9]{3})-' $dirname
+                    set number (string sub -l 3 $dirname)
+                    # Remove leading zeros
+                    set number (math $number + 0)
+                    if test $number -gt $highest
+                        set highest $number
+                        set latest_feature $dirname
+                    end
+                end
+            end
+        end
+
+        if test -n "$latest_feature"
+            echo $latest_feature
+            return
+        end
+    end
+
+    echo "main"  # Final fallback
+end
+
+# Check if we have git available
+function has_git
+    git rev-parse --show-toplevel 2>/dev/null >/dev/null
+    return $status
+end
+
+function check_feature_branch
+    set branch $argv[1]
+    set has_git_repo $argv[2]
+
+    # For non-git repos, we can't enforce branch naming but still provide output
+    if test "$has_git_repo" != "true"
+        echo "[specify] Warning: Git repository not detected; skipped branch validation" >&2
+        return 0
+    end
+
+    if not string match -qr '^[0-9]{3}-' $branch
+        echo "ERROR: Not on a feature branch. Current branch: $branch" >&2
+        echo "Feature branches should be named like: 001-feature-name" >&2
+        return 1
+    end
+
+    return 0
+end
+
+function get_feature_dir
+    echo "$argv[1]/specs/$argv[2]"
+end
+
+# Find feature directory by numeric prefix instead of exact branch match
+function find_feature_dir_by_prefix
+    set repo_root $argv[1]
+    set branch_name $argv[2]
+    set specs_dir "$repo_root/specs"
+
+    # Extract numeric prefix from branch
+    if not string match -qr '^([0-9]{3})-' $branch_name
+        # If branch doesn't have numeric prefix, fall back to exact match
+        echo "$specs_dir/$branch_name"
+        return
+    end
+
+    set prefix (string sub -l 3 $branch_name)
+
+    # Search for directories in specs/ that start with this prefix
+    set matches
+
+    if test -d "$specs_dir"
+        for dir in $specs_dir/$prefix-*
+            if test -d "$dir"
+                set -a matches (basename $dir)
+            end
+        end
+    end
+
+    # Handle results
+    if test (count $matches) -eq 0
+        # No match found
+        echo "$specs_dir/$branch_name"
+    else if test (count $matches) -eq 1
+        # Exactly one match - perfect!
+        echo "$specs_dir/$matches[1]"
+    else
+        # Multiple matches - this shouldn't happen
+        echo "ERROR: Multiple spec directories found with prefix '$prefix': $matches" >&2
+        echo "Please ensure only one spec directory exists per numeric prefix." >&2
+        echo "$specs_dir/$branch_name"
+    end
+end
+
+function get_feature_paths
+    set repo_root (get_repo_root)
+    set current_branch (get_current_branch)
+    set has_git_repo "false"
+
+    if has_git
+        set has_git_repo "true"
+    end
+
+    # Use prefix-based lookup to support multiple branches per spec
+    set feature_dir (find_feature_dir_by_prefix $repo_root $current_branch)
+
+    echo "set REPO_ROOT '$repo_root';"
+    echo "set CURRENT_BRANCH '$current_branch';"
+    echo "set HAS_GIT '$has_git_repo';"
+    echo "set FEATURE_DIR '$feature_dir';"
+    echo "set FEATURE_SPEC '$feature_dir/spec.md';"
+    echo "set IMPL_PLAN '$feature_dir/plan.md';"
+    echo "set TASKS '$feature_dir/tasks.md';"
+    echo "set RESEARCH '$feature_dir/research.md';"
+    echo "set DATA_MODEL '$feature_dir/data-model.md';"
+    echo "set QUICKSTART '$feature_dir/quickstart.md';"
+    echo "set CONTRACTS_DIR '$feature_dir/contracts';"
+end
+
+function check_file
+    if test -f "$argv[1]"
+        echo "  ✓ $argv[2]"
+    else
+        echo "  ✗ $argv[2]"
+    end
+end
+
+function check_dir
+    if test -d "$argv[1]"; and test -n (ls -A $argv[1] 2>/dev/null)
+        echo "  ✓ $argv[2]"
+    else
+        echo "  ✗ $argv[2]"
+    end
+end