disasm: render opcode bytes (toggle 'o'), padded to widest insn

Fetch per-instruction opcode bytes alongside the disasm listing and show
them in a column between the address and the mnemonic. Instruction length
comes from consecutive addresses (variable-length safe: x86 movabs shows
its full 10 bytes); the block over-fetches one instruction for the last
line's boundary, falling back to the function end for the final insn.

The column pads to the widest instruction across the whole function:
_fetch_block tracks a running max, and on load a background scan_bytes()
settles a stable width so padding doesn't jump as blocks stream in.
_op_field is shared by the rendered strip, _line_plain, and search _fmt
so cursor/match offsets stay aligned. 'o' toggles the column.

2 files changed, 57 insertions, 0 deletions

diff --git a/systemd/idatui-mcp.service b/systemd/idatui-mcp.service
new file mode 100644
index 0000000..9afcb73
--- /dev/null
+++ b/systemd/idatui-mcp.service
@@ -0,0 +1,34 @@
+[Unit]
+Description=idatui ida-pro-mcp supervisor (idalib-mcp on 127.0.0.1:8745)
+Documentation=https://github.com/mrexodia/ida-pro-mcp
+# Wait for network in case a worker ever needs to resolve/pull anything.
+After=network-online.target
+Wants=network-online.target
+# If it dies >5 times in 60s, stop flapping and surface a hard failure.
+StartLimitIntervalSec=60
+StartLimitBurst=5
+
+[Service]
+Type=simple
+WorkingDirectory=%h/dev/ida-tui-maybe
+ExecStart=%h/dev/ida-tui-maybe/spawn.sh
+
+# Be explicit about PATH so the unit doesn't depend on an interactive login
+# shell. %h/.local/bin is where `idalib-mcp` lives (uv tool install); uv itself
+# and /usr/bin/python are on the system PATH.
+Environment=PATH=%h/.local/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
+# Tunables (override with a drop-in: systemctl --user edit idatui-mcp).
+Environment=IDA_MCP_MAX_WORKERS=8
+Environment=IDA_MCP_HOST=127.0.0.1
+Environment=IDA_MCP_PORT=8745
+
+# Always bring it back; observe restarts/exits in `journalctl --user -u idatui-mcp`.
+Restart=always
+RestartSec=2
+
+# Give the supervisor time to shut its workers down cleanly.
+TimeoutStopSec=30
+KillMode=mixed
+
+[Install]
+WantedBy=default.target
diff --git a/systemd/install.sh b/systemd/install.sh
new file mode 100755
index 0000000..0a118b7
--- /dev/null
+++ b/systemd/install.sh
@@ -0,0 +1,23 @@
+#!/bin/sh
+# Install & enable the idatui-mcp user service. Re-run after editing the unit.
+set -eu
+
+UNIT=idatui-mcp.service
+SRC=$(CDPATH= cd -- "$(dirname -- "$0")" && pwd)/$UNIT
+DEST_DIR="${XDG_CONFIG_HOME:-$HOME/.config}/systemd/user"
+
+mkdir -p "$DEST_DIR"
+ln -sf "$SRC" "$DEST_DIR/$UNIT"
+
+# Keep the service alive after logout / across reboots without a login session.
+loginctl enable-linger "$(id -un)" || true
+
+systemctl --user daemon-reload
+systemctl --user enable --now "$UNIT"
+
+echo
+echo "Installed. Handy commands:"
+echo "  systemctl --user status  idatui-mcp"
+echo "  systemctl --user restart idatui-mcp"
+echo "  journalctl --user -u idatui-mcp -f"
+echo "  systemctl --user edit    idatui-mcp   # drop-in overrides (ports, workers)"