#!/bin/sh
# The terminal reader, `ipx`, for Linux amd64 and Apple silicon Macs, into target/tui/.
#
#   sh scripts/build-tui.sh
#
# Cross-compiled with cargo-zigbuild, whose image carries zig as the linker and macOS's SDK, so no
# Mac is needed. The Linux build is musl and static: it runs on any distribution. A release build
# of every dependency is the kind that took Tower down on 2026-11-04, so it runs in a container
# under the same cap as scripts/build-image.sh's builder (6 GB, six threads); if the cap kills it,
# say so and leave the cap be.
set -eu

MEM=6g
CPUS=0-5
NEED_KB=$((9 * 1024 * 1024))
MAX_LOAD=12
IMAGE=ghcr.io/rust-cross/cargo-zigbuild:0.24.1
TARGETS="x86_64-unknown-linux-musl aarch64-apple-darwin"
# Tower's paths, since the Docker daemon is Tower's (see scripts/coverage.sh).
SRC=/mnt/user/vscode/ipx
TARGET=/mnt/fast/vscode/ipx/target-real

cd "$(dirname "$0")/.."

avail=$(awk '/^MemAvailable:/ {print $2}' /proc/meminfo)
load=$(cut -d' ' -f1 /proc/loadavg)
echo "MemAvailable $((avail / 1024)) MB, load $load"
if [ "$avail" -lt "$NEED_KB" ]; then
  echo "refusing: under $((NEED_KB / 1024 / 1024)) GB available. Wait, or find what is using it." >&2
  exit 1
fi
if awk -v l="$load" -v m="$MAX_LOAD" 'BEGIN { exit !(l > m) }'; then
  echo "refusing: load over $MAX_LOAD. Wait for it to come down." >&2
  exit 1
fi

# The source read only; the registry and the compiled crates are kept between runs.
docker run --rm --memory "$MEM" --memory-swap "$MEM" --cpuset-cpus "$CPUS" \
  -v "$SRC:/work:ro" -v "$TARGET:/target" -v "$TARGET/tui-registry:/usr/local/cargo/registry" \
  -e CARGO_TARGET_DIR=/target/tui-build -w /work "$IMAGE" sh -euc "
    rustup target add $TARGETS >/dev/null
    for t in $TARGETS; do cargo zigbuild --locked --release -p ipx-tui --target \$t; done
    mkdir -p /target/tui
    # -f replaces a binary someone is running (Text file busy) rather than writing into it.
    cp -f /target/tui-build/x86_64-unknown-linux-musl/release/ipx /target/tui/ipx-linux-amd64
    cp -f /target/tui-build/aarch64-apple-darwin/release/ipx /target/tui/ipx-macos-arm64
  " || {
    code=$?
    [ "$code" -eq 137 ] && echo "killed at the ${MEM} memory cap: tell the user, do not raise it" >&2
    exit "$code"
  }
ls -l target/tui