Sublimerge: Compare to Tag… A Custom Comparison for Sublimerge v2.7.5 for Git users. Compare your current working copy with any tag. Sublimerge is a professional, side-by-side diff tool for Sublime Text 2 and 3 / www.sublimerge.com

Custom Comparisons.sublime-settings

{
    "custom_comparisons_user": [
        {
            "name": "Compare to Tag...",
            "requires": "git",
            "steps": [
                {
                    "quick_panel": {
                        "name": "tag",
                        "source": {
                            "execute": {
                                "command": "{config:git_executable_path} tag",
                                "directory": "{sublimerge:repo_root}"
                            },
                            "item": {
                                "regexp": "^.*$",
                                "caption": ["@0", "{sublimerge:current_file_name} in @0"],
                                "value": "@0"
                            },
                            "reverse": true, //remove it for compatibility with Sublimerge v2.7.4
                        
                            "empty_message": "There are no tags"
                        }
                    }
                },
                {
                    "define": {
                        "output_file": "{sublimerge:temp_dir}/{sublimerge:current_file_name}@{tag}"
                    }
                },
                {
                    "compare": {
                        "execute": {
                            "command": "{config:git_executable_path} show \"{tag}\":\"./{sublimerge:current_file_name}\" > \"{output_file}\"",
                            "directory": "{sublimerge:current_file_dir}"
                        },
                        "left": {
                            "file": "{output_file}",
                            "temporary": true
                        },
                        "right": {
                            "file": "{sublimerge:current_file}",
                            "temporary": false
                        }
                    }
                }
            ]
        }
    ]
}