Add plugins support 4 snapcraft (#512)

* Added `snap` support.

* Added plugins support.

* Add README 4 snap.

---------

Co-authored-by: Kelly Brazil <kellyjonbrazil@gmail.com>

README-snap.md

@@ -0,0 +1,75 @@
+# How to use `jc` with `snap`
+
+## How to build `snap` package
+
+- Install `snapd`. [One](https://snapcraft.io/docs/installing-snapd) or [two](https://github.com/don-rumata/ansible-role-install-snap).
+
+- Install `snapcraft`:
+
+```bash
+$ sudo snap install snapcraft --classic
+```
+
+- Update snapd:
+
+```bash
+$ sudo snap refresh snapcraft --edge
+```
+
+- Clone the repo:
+
+```bash
+$ git clone https://github.com/kellyjonbrazil/jc
+```
+
+- Change the directory:
+
+```bash
+$ cd ./jc
+```
+
+- Select branch:
+
+```bash
+$ git checkout snap-support
+```
+
+- Initialize LXD:
+
+```bash
+$ lxd init --auto
+```
+
+- Build `.snap` file:
+
+```bash
+$ snapcraft
+```
+
+## How to install local snap file
+
+```bash
+$ snap install --dangerous ./jc_*_amd64.snap
+```
+
+## How to use `jc` with plugins
+
+- Put your plugin in the `"$HOME/.local/share/jc"` directory.
+
+- To connect the directory, run:
+
+```bash
+snap connect jc:dot-jc-plugins snapd
+```
+
+## Urls
+
+- <https://snapcraft.io/docs/supported-interfaces>
+
+- <https://snapcraft.io/docs/interface-management>
+
+- <https://snapcraft.io/docs/personal-files-interface>
+
+- <https://snapcraft.io/docs/python-apps>
+
+- <https://documentation.ubuntu.com/lxd/en/latest/getting_started/>

snap/local/jc-launcher.sh

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+#!/bin/sh
+
+PATH_TO_JC="$SNAP/bin/jc"
+
+# Don't work. I don't know why.
+# if [ -w "$SNAP_REAL_HOME/.local/share/jc" ] ; then
+
+if ls "$SNAP_REAL_HOME/.local/share/jc" 1>/dev/null 2>/dev/null
+then
+    HOME="$SNAP_REAL_HOME" "$PATH_TO_JC" "$@";
+else
+    "$PATH_TO_JC" "$@";
+fi

snap/snapcraft.yaml

@@ -0,0 +1,58 @@
+---
+name: jc
+title: Convert command output to json
+summary: CLI tool that converts the output command-line tools to JSON
+description: |
+    CLI tool and python library that converts the output of popular command-line
+    tools, file-types, and common strings to JSON, YAML, or Dictionaries.
+    This allows piping of output to tools like jq and simplifying automation scripts.
+
+    How to use `jc` with plugins:
+    1. Put your plugin in the "$HOME/.local/share/jc" directory.
+    2. Run for `snap connect jc:dot-jc-plugins snapd` connect the directory.
+# version: git
+base: core22
+confinement: strict
+license: MIT
+type: app
+
+website: https://github.com/kellyjonbrazil/jc
+contact: Kelly Brazil <kellyjonbrazil@gmail.com>
+source-code: https://github.com/kellyjonbrazil/jc
+issues: https://github.com/kellyjonbrazil/jc/issues
+
+adopt-info: jc
+
+parts:
+  launcher:
+    plugin: dump
+    source: snap/local
+    organize:
+      jc-launcher.sh: bin/
+
+  jc:
+    plugin: python
+    source: .
+    # pulled v1.17.2, `git describe`
+    # source: https://github.com/kellyjonbrazil/jc
+    override-pull: |
+      craftctl default
+      JC_VERSION=$(grep version= setup.py | cut -d '=' -f 2 | sed "s/,$// ; s/'//g")
+      craftctl set version=$JC_VERSION
+      craftctl set grade="stable"
+
+plugs:
+  dot-jc-plugins:
+    interface: personal-files
+    read:
+      - $HOME/.local
+      - $HOME/.local/share
+
+apps:
+  jc:
+    command: bin/jc-launcher.sh
+    environment:
+      LC_ALL: C.UTF-8
+    plugs:
+      - home
+      - dot-jc-plugins