feat: first implementation

LICENSE

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+The MIT License (MIT)
+
+Copyright (c) 2019 nju33 <nju33.ki@gmail.com>
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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+<img src="https://cdn.rawgit.com/oh-my-fish/oh-my-fish/e4f1c2e0219a17e2c748b824004c8d0b38055c16/docs/logo.svg" align="left" width="144px" height="144px"/>
+
+#### age
+
+> To get next version from git tag (e.g. v1.0.0)
+
+[![MIT License](https://img.shields.io/badge/license-MIT-007EC7.svg?style=flat-square)](/LICENSE)
+[![Fish Shell Version](https://img.shields.io/badge/fish-v3.0.0-007EC7.svg?style=flat-square)](https://fishshell.com)
+[![Oh My Fish Framework](https://img.shields.io/badge/Oh%20My%20Fish-Framework-007EC7.svg?style=flat-square)](https://www.github.com/oh-my-fish/oh-my-fish)
+
+<br/>
+
+## Install
+
+```fish
+$ omf install age
+```
+
+## Usage
+
+```sh
+$ git tag
+v0.0.1
+
+$ age --major
+v1.0.0
+
+$ age --minor
+v0.1.0
+
+$ age --patch
+v0.0.2
+```

completions/age.fish

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+# Always provide completions for command line utilities.
+#
+# Check Fish documentation about completions:
+# http://fishshell.com/docs/current/commands.html#complete
+#
+# If your package doesn't provide any command line utility,
+# feel free to remove completions directory from the project.
+
+complete -c age -l major -d 'print next major version'
+complete -c age -l minor -d 'print next minor version'
+complete -c age -l patch -d 'print next patch version'

functions/age.fish

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+function age -d "Just to get next version tag on git"
+  argparse -n age 'M/major' 'm/minor' 'p/patch' -- $argv
+  or return 1
+
+  set -l tags (git tag --sort=-taggerdate | xargs -n 1000)
+
+  set -l latest_version "v0.0.0"
+  for tag in (string split ' ' $tags)
+    set -l matches (string match -r 'v\d+\.\d+\.\d+' $tag)
+    if test $matches
+      set latest_version $tag
+      break
+    end
+  end
+
+  set -l matches (string match -r '(\d+)\.(\d+)\.(\d+)' $latest_version)
+  set -l major $matches[2]
+  set -l minor $matches[3]
+  set -l patch $matches[4]
+
+  if set -lq _flag_patch _flag_p
+    echo v{$major}.{$minor}.(math $patch + 1)
+    return
+  else if set -lq _flag_minor _flag_m
+    echo v{$major}.(math $minor + 1).0
+    return
+  else if set -lq _flag_major _flag_M
+    echo v(math $major + 1).0.0
+    return
+  else
+    echo 'Specify one of major|minor|patch as option'
+    return 1
+  end
+end

init.fish

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+# age initialization hook
+#
+# You can use the following variables in this file:
+# * $package       package name
+# * $path          package path
+# * $dependencies  package dependencies

uninstall.fish

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+# age uninstall hook
+#
+# You can use this file to do custom cleanup when the package is uninstalled.
+# You can use the variable $path to access the package path.