Add systemd support

share/systemd/README.md

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+To add **wttr.in** to systemd as a service, do the following steps.
+
+
+1. **Create a systemd service file**: You’ll need to create a service file in `~/.config/systemd/user/` (for user-level) or `/etc/systemd/system/` (for system-wide) directory. Let’s create it for a user.
+
+Create the directory if it doesn’t exist:
+
+```bash
+mkdir -p ~/.config/systemd/user/
+```
+
+Then, create the service file called `myscript.service`:
+
+```bash
+cp share/systemd/wttrin.service ~/.config/systemd/user/myscript.service
+```
+
+2. **Reload the systemd daemon**: This will ensure systemd recognizes the new service.
+
+```bash
+systemctl --user daemon-reload
+```
+
+4. **Enable and start your service**:
+
+To start the service immediately, run:
+
+```bash
+systemctl --user start wttrin.service
+```
+
+To enable it to start automatically at boot, run:
+
+```bash
+systemctl --user enable wttrin.service
+```
+
+5. **Check the status**: To verify that your service is running correctly, you can check its status:
+
+```bash
+systemctl --user status wttrin.service
+```

share/systemd/wttrin.service

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+[Unit]
+Description=wttr.in services
+
+[Service]
+Type=oneshot
+RemainAfterExit=yes
+ExecStart=/home/igor/src/wttr.in/share/systemd/wttrin.sh session1
+ExecStop=/usr/bin/tmux kill-session -t session1
+
+[Install]
+WantedBy=default.target

share/systemd/wttrin.sh

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+#!/usr/bin/env bash
+
+SESSION_NAME=""
+SRC_DIR=/home/igor/src/wttr.in
+SERVICES_FILE=config/services/services.yaml
+
+start_service() {
+  local name="$1"
+  local workdir="$2"
+  local cmd="$3"
+
+  if [[ -z "$SESSION_NAME" ]]; then
+    echo Unknown SESSION_NAME. Exiting >&2
+    exit 1
+  fi
+
+  local WINDOW_NAME="$name"
+  local TEXT_TO_ENTER="cd $workdir && $cmd"
+
+  if ! tmux has-session -t "$SESSION_NAME" >& /dev/null; then
+    tmux new-session -d -s "$SESSION_NAME"
+  fi
+
+  # Create a new window if it doesn't exist
+  tmux list-windows -t "$SESSION_NAME" | grep -q "^.\+ $WINDOW_NAME " || tmux new-window -t "$SESSION_NAME" -n "$WINDOW_NAME"
+
+  sleep 0.05
+
+  # Send text to the new window and press Enter
+  tmux send-keys -t "$SESSION_NAME:$WINDOW_NAME" "$TEXT_TO_ENTER" C-m
+}
+
+
+main() {
+  local name
+  local cmd
+
+  if [[ -n $1 ]]; then
+    SESSION_NAME=$1
+  else
+    echo Usage: $0 SESSION_NAME >&2
+    exit 1
+  fi
+
+  cd "$SRC_DIR" || exit 1
+
+  set -x
+
+  while read -r line; do
+    name=$(jq -r .name <<< "$line")
+    workdir=$(jq -r .workdir <<< "$line")
+    cmd=$(jq -r .command <<< "$line")
+
+    start_service "$name" "$workdir" "$cmd"
+  done <<< "$(yq -c .services[] < "$SERVICES_FILE")"
+}
+
+main "$@"