From f855cac04046fe1ad8222aeddbd25cdb7c0c2ed0 Mon Sep 17 00:00:00 2001
From: Chaos Rogers <git@shed.gay>
Date: Tue, 21 Oct 2025 23:40:14 +0100
Subject: [PATCH] feat: add mock Teensy support with entrypoint and LTC
 generator

Co-authored-by: aider (openai/gpt-5) <aider@aider.chat>
---
 Dockerfile            |  5 +++++
 docker-compose.yml    |  1 +
 scripts/entrypoint.sh | 27 +++++++++++++++++++++++++++
 scripts/ltc_gen.sh    | 43 +++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 76 insertions(+)
 create mode 100644 scripts/entrypoint.sh
 create mode 100644 scripts/ltc_gen.sh

diff --git a/Dockerfile b/Dockerfile
index b702e62..45abb50 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -31,14 +31,19 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
     libudev1 \
     ca-certificates \
     tzdata \
+    socat \
  && rm -rf /var/lib/apt/lists/*
 
 WORKDIR /app
 
 COPY --from=builder /app/target/release/get-haci /usr/local/bin/get-haci
 COPY static ./static
+COPY scripts/entrypoint.sh /usr/local/bin/entrypoint.sh
+COPY scripts/ltc_gen.sh /usr/local/bin/ltc-gen.sh
+RUN chmod +x /usr/local/bin/entrypoint.sh /usr/local/bin/ltc-gen.sh
 
 ENV RUST_LOG=info
 EXPOSE 8080
 
+ENTRYPOINT ["/usr/local/bin/entrypoint.sh"]
 CMD ["get-haci"]
diff --git a/docker-compose.yml b/docker-compose.yml
index 554d6d6..430ea1a 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -6,6 +6,7 @@ services:
     container_name: haci
     environment:
       - RUST_LOG=info
+      - MOCK_TEENSY=1
     ports:
       - "8080:8080"
     volumes:
diff --git a/scripts/entrypoint.sh b/scripts/entrypoint.sh
new file mode 100644
index 0000000..dcde2a1
--- /dev/null
+++ b/scripts/entrypoint.sh
@@ -0,0 +1,27 @@
+#!/bin/sh
+set -eu
+
+# If enabled, start a mock Teensy that exposes a PTY at /dev/ttyACM0 and streams LTC-like lines.
+if [ "${MOCK_TEENSY:-0}" = "1" ]; then
+  echo "[entrypoint] Starting mock Teensy (PTY at /dev/ttyACM0)..." >&2
+  # Bridge the LTC generator to a PTY that looks like a Teensy serial port.
+  # Left side runs the generator, right side is a PTY linked to /dev/ttyACM0
+  socat -d -d -lf /dev/stderr EXEC:'/usr/local/bin/ltc-gen.sh',pty,ctty,echo=0,raw PTY,link=/dev/ttyACM0,raw,echo=0 &
+  SOCAT_PID=$!
+
+  # Wait briefly for the PTY to appear
+  i=0
+  while [ $i -lt 50 ]; do
+    if [ -e /dev/ttyACM0 ]; then
+      break
+    fi
+    i=$((i+1))
+    sleep 0.1
+  done
+  if [ ! -e /dev/ttyACM0 ]; then
+    echo "[entrypoint] WARNING: Failed to create /dev/ttyACM0 (mock Teensy)" >&2
+  fi
+fi
+
+# Run the requested command (default: get-haci)
+exec "$@"
diff --git a/scripts/ltc_gen.sh b/scripts/ltc_gen.sh
new file mode 100644
index 0000000..9d1c0b8
--- /dev/null
+++ b/scripts/ltc_gen.sh
@@ -0,0 +1,43 @@
+#!/bin/sh
+set -eu
+
+# Simple LTC-like line generator to feed into a PTY for development.
+# It outputs lines like: "LOCK HH:MM:SS;FF 25.00"
+# Configure frames-per-second via LTC_FPS environment variable (23,24,25,29,30 supported).
+FPS="${LTC_FPS:-25}"
+
+case "$FPS" in
+  23) PERIOD="0.0417083"; RATE_STR="23.98" ;;
+  24) PERIOD="0.0416667"; RATE_STR="24.00" ;;
+  25) PERIOD="0.0400000"; RATE_STR="25.00" ;;
+  29) PERIOD="0.0333667"; RATE_STR="29.97" ;;
+  30) PERIOD="0.0333333"; RATE_STR="30.00" ;;
+  *)  PERIOD="0.0400000"; RATE_STR="25.00"; FPS="25" ;;
+esac
+
+h=12
+m=0
+s=0
+f=0
+
+while true; do
+  printf "LOCK %02d:%02d:%02d;%02d %s\r\n" "$h" "$m" "$s" "$f" "$RATE_STR"
+
+  # increment frame
+  f=$((f+1))
+  if [ "$f" -ge "$FPS" ]; then
+    f=0
+    s=$((s+1))
+    if [ "$s" -ge 60 ]; then
+      s=0
+      m=$((m+1))
+      if [ "$m" -ge 60 ]; then
+        m=0
+        h=$(( (h + 1) % 24 ))
+      fi
+    fi
+  fi
+
+  # sleep to approximate frame cadence
+  sleep "$PERIOD"
+done