Added hyprsolusctl

Added hyprsolusctl which is a control script for managing hyprsolus.
Features include:
  - checking for new updates. This provides the ability to know when a
    newer version of Hyprland has been release. Note that this works
    based off the tags of Hyprland, which are the releases.
  - provide info of the latest changes. The changelog provided by
    Hyprland is saved locally under $HOME/.cached and can be viewed any
    time. If a newer version of Hyprland is available the changelog will
    be this.
  - update hyprsolus. The ability to update hyprsolus itself.
  - upgrading the system (WIP). The system is prepared and upgraded with
    the latest versions of libraries, components provided by hyprsolus
    and importantly Hyprland itself.

hyprsolusctl

@@ -0,0 +1,128 @@
+#!/usr/bin/env bash
+
+HYPRSOLUS_PATH="/usr/src/hyprsolus"
+
+# create cache folder for Hyprland metadata
+cache="$HOME/.cache/hyprsolus"
+[[ ! -d "$cache" ]] && mkdir -p "$cache" >/dev/null
+
+check () {
+    >&2 echo "Checking for Hyprland upgrades..."
+    # ensure that Hyprland is even running
+    if ! pidof hyprland
+    then
+        >&2 echo "Could not find Hyprland process. Is it even running?"
+        exit 255
+    fi
+    # get the releases from the origin
+    origin=$(curl -sL \
+        https://api.github.com/repos/hyprwm/Hyprland/releases)
+    exit_code=$?
+    # check if the cURL was successful
+    if [[ $exit_code -ne 0 ]]
+    then
+        >&2 echo "Failed to contact GitHub API. Check Internet connection and \
+            try again."
+        exit 254
+    fi
+    # latest tag release in origin and current Hyprland version
+    origin_vers=$(echo "$origin" | jq -r ".[0].tag_name")
+    hyprland_vers=$(hyprctl version | sed -nr 's/Tag: (.*),.*/\1/p')
+
+    [[ ! -e "$cache/metadata.json" ]] && echo "$origin" \
+        | jq -r ".[] | select(.tag_name == \"$hyprland_vers\")" \
+        >"$cache/metadata.json"
+
+    if [[ "$origin_vers" != "$hyprland_vers" ]]
+    then
+        echo "$origin" | jq -r ".[0]" >"$cache/release-metadata.json"
+        notify-send -a "Hyprsolus" "Hyprland Update Available" \
+            "A new version of Hyprland is available ($origin_vers)."
+    else
+        >&2 echo "No upgrade available. Ensuring most recent metadata..."
+        [[ -f "$cache/release-metadata.json" ]] && \
+            mv "$cache/release-metadata.json" "$cache/metadata.json"
+    fi
+}
+
+info () {
+    while test $# -ne 0
+    do
+        case $1 in
+            --local) shift ; release=0 ;;
+            --json) shift ; json=0 ;;
+            --) shift ; glow_args="$*" ; break ;;
+            *) echo "$1"
+        esac
+    done
+
+    # Initialise defaults if no flags given
+    release=${release:-1}
+    json=${json:-1}
+
+    if [[ -e "$cache/release-metadata.json" && $release -eq 1 ]]
+    then
+        [[ ! -s "$cache/release-metadata.json" ]] && exit 2
+        [[ $json -eq 0 ]] && cat "$cache/release-metadata.json" && exit 0
+        jq -r ".body" < "$cache/release-metadata.json" | glow "$glow_args" -
+    elif [[ -e "$cache/metadata.json" ]]
+    then
+        [[ ! -s "$cache/metadata.json" ]] && exit 2
+        [[ $json -eq 0 ]] && cat "$cache/metadata.json" && exit 0
+        jq -r ".body" "$cache/metadata.json" | glow "$glow_args" -
+    else
+        exit 1
+    fi
+}
+
+update () {
+  cd "$HYPRSOLUS_PATH"
+
+  # Fetch new content from remote
+  git fetch origin --all
+  git pull origin main
+
+  echo "(hyprsolus) Updating the dependencies if needed."
+  sudo sh "${HYPRSOLUS_PATH}/requirements.sh"
+
+  echo "(hyprsolus) Updating additional scripts if needed."
+  sudo cp -ru "${HYPRSOLUS_PATH}/systemd" "$HOME/.config/systemd/"
+  sudo cp -u "${HYPRSOLUS_PATH}/hyprsolusctl" "$HYPRSOLUSCTL_PATH" & disown
+}
+
+upgrade () {
+  while test $# -ne 0
+  do
+    case $1 in
+      --ensure-integrity) shift ; eopkg_check=0 ;;
+    esac
+  done
+
+  eopkg_check=${eopkg_check:-1}
+  if [[ $eopkg_check -eq 0 ]]
+  then
+    echo -n "Check package intergity..."
+    while read -r line
+    do
+      check=$(eopkg check --no-color "$line" | grep -o "OK")
+      if [[ $check != OK ]]
+      then
+        >&2 echo -e "failed.\n[FATAL] The following package is corrupt: $line."\
+          "Aborting upgrade."
+        exit 3
+      fi
+    done < <(cat depends.txt)
+    echo "ok."
+  fi
+
+  # TODO: Implement calls to make build system
+}
+
+case $1 in
+    check) check ;;
+    update) update ;;
+    upgrade) shift ; upgrade "$@" ;;
+    info) shift ; info "$@" ;;
+    *) exit 1 ;;
+esac
+exit 0