chore(code): Add spawn script for fish shell

code/scripts/spawn.fish

@@ -0,0 +1,79 @@
+#!/usr/bin/env fish
+
+# This script takes:
+# - a number of nodes to run as an argument, 
+# - the home directory for the nodes configuration folders
+
+function help
+    echo "Usage: spawn.fish [--help] --nodes NODES_COUNT --home NODES_HOME"
+end
+
+argparse -n spawn.fish 'help' 'nodes=' 'home=' -- $argv
+or return
+
+if set -ql _flag_help
+    help
+    return 0
+end
+
+if ! set -q _flag_nodes
+    help
+    return 1
+end
+
+if ! set -q _flag_home
+    help
+    return 1
+end
+
+set -x MALACHITE__CONSENSUS__MAX_BLOCK_SIZE   "1 MiB"
+set -x MALACHITE__TEST__TXS_PER_PART          50
+set -x MALACHITE__TEST__TIME_ALLOWANCE_FACTOR 0.7
+set -x MALACHITE__TEST__EXEC_TIME_PER_PART    "10ms"
+
+echo "Compiling Malachite..."
+cargo build --release
+
+set session "malachite"
+tmux kill-session -t $session
+tmux new-session -s $session -n "main" -d
+
+set NODES_COUNT $_flag_nodes
+set NODES_HOME  $_flag_home
+
+for NODE in (seq 0 $(math $NODES_COUNT - 1))
+    set NODE_HOME "$NODES_HOME/$NODE"
+    mkdir -p "$NODE_HOME/logs"
+    rm -f "$NODE_HOME/logs/*.log"
+
+    set pane $(tmux new-window -P -n "node-$NODE" /bin/zsh)
+
+    echo "[Node $NODE] Spawning node..."
+
+    tmux send -t "$pane" "cargo run -q --release -- start --home '$NODE_HOME' 2>&1 > '$NODE_HOME/logs/node.log' &" Enter
+    tmux send -t "$pane" "echo \$! > '$NODE_HOME/node.pid'" Enter
+    tmux send -t "$pane" "tail -f '$NODE_HOME/logs/node.log'" Enter
+end
+
+function exit_and_cleanup --on-signal INT
+end
+
+echo "Spawned $NODES_COUNT nodes."
+echo
+
+read -l -P "Press Enter to launch tmux... " done
+tmux attach -t $session
+echo
+
+read -l -P "Press Enter to stop the nodes... " done
+
+echo "Stopping all nodes..."
+for NODE in (seq 0 $(math $NODES_COUNT - 1))
+    set NODE_PID (cat "$NODES_HOME/$NODE/node.pid")
+    echo "[Node $NODE] Stopping node (PID: $NODE_PID)..."
+    kill $NODE_PID
+end
+echo
+
+read -l -P "Press Enter to kill the tmux session... " done
+tmux kill-session -t $session