# env/runtime.env — single self-configuring runtime environment for Klammertext.
#
# Source this from your shell profile (~/.bashrc etc.):
#     source /path/to/klammertext/K/env/runtime.env
#
# This is the runtime counterpart of the shared env/makefile.env: one file
# for every machine, with all machine-specific values AUTO-DETECTED. There is no
# per-host runtime.env.<host> file and no HOST/OS/SITE selector.
#   - KLAMMERTEXT_HOME     : derived from this file's own location (self-locating)
#   - KLAMMERTEXT_TEXLIVE_BIN : newest ~/external/texlive/<year>/bin/<arch>
# Machine-unique, non-committable additions (extra library paths such as NVIDIA
# iray, local tools, etc.) go in an optional, gitignored env/runtime.env.local
# sourced at the end -- NOT in this shared file, so one machine's bundled
# libraries can't shadow another's system libraries.

# --- KLAMMERTEXT_HOME: self-locate (bash sets BASH_SOURCE; zsh sets $0) --------
# This file lives at $KLAMMERTEXT_HOME/env/runtime.env, so go up one level.
_kt_self="${BASH_SOURCE[0]:-$0}"
export KLAMMERTEXT_HOME="$(cd "$(dirname "$_kt_self")/.." && pwd)"
unset _kt_self

_kt_uname="$(uname -s)"
# Windows under MSYS2: the commands are native programs and never understand
# MSYS's /c/... spelling, so KLAMMERTEXT_HOME and TMPDIR reach them in Windows
# form (C:/..., cygpath -m).  bash's own PATH keeps the POSIX form -- a colon
# inside a PATH entry splits it.  Python (python.org's) is the user's to put on
# PATH; an MSYS2 login shell does not inherit the Windows PATH by default.
_kt_home_posix="$KLAMMERTEXT_HOME"
case "$_kt_uname" in
    MINGW*|MSYS*)
        export KLAMMERTEXT_HOME="$(cygpath -m "$KLAMMERTEXT_HOME")"
        export TMPDIR="$(cygpath -m "${TMPDIR:-/tmp}")"
        export PYTHON="${PYTHON:-python}"     # python.org installs no python3
        ;;
esac

# --- KLAMMERTEXT_TEXLIVE_BIN: newest installed TeX Live under ~/external -------
# Klammertext's TeX Live installs are named by 4-digit year (2024, 2025, 2026).
# Match only those so unrelated dirs (e.g. a "texlive-2022-min" system install)
# are never selected; sort -V then picks the newest year.
if [ "$_kt_uname" = "Darwin" ]; then
    _kt_arch="universal-darwin"
elif case "$_kt_uname" in MINGW*|MSYS*) true;; *) false;; esac; then
    _kt_arch="windows"                    # TeX Live's bin/windows
else
    _kt_arch="$(uname -m)-linux"          # e.g. x86_64-linux
fi
# Use `find` with a -path pattern, NOT a shell glob: on macOS/zsh an unmatched
# glob (no texlive installed) is a hard "no matches found" error, whereas find
# just returns nothing. The -path pattern keeps the 4-digit-year restriction.
# Windows: a user installs under the Windows home, %USERPROFILE%\external
# (MSYS2's $HOME is C:\msys64\home\<user>, which no Windows guide would name).
_kt_tlroot="$HOME/external/texlive"
case "$_kt_uname" in MINGW*|MSYS*) _kt_tlroot="$(cygpath -u "$USERPROFILE")/external/texlive";; esac
_kt_tl="$(find "$_kt_tlroot" -maxdepth 3 -type d \
             -path "*/[0-9][0-9][0-9][0-9]/bin/$_kt_arch" 2>/dev/null \
         | sort -V | tail -1)"
[ -n "$_kt_tl" ] && export KLAMMERTEXT_TEXLIVE_BIN="$_kt_tl"
unset _kt_tl _kt_arch _kt_tlroot

# --- PATH (TeX Live appended only if one was found) ---------------------------
export PATH="$_kt_home_posix/bin:$_kt_home_posix/tst${KLAMMERTEXT_TEXLIVE_BIN:+:$KLAMMERTEXT_TEXLIVE_BIN}:$PATH"
unset _kt_home_posix

# --- The Python binding (kpy/) -----------------------------------------------
# "import klammertext" with no setup, as the container image already arranges
# through its own PYTHONPATH.  Prepended, so a source build shadows any other
# copy; the module is bound to the Python the library was built against.
export PYTHONPATH="$KLAMMERTEXT_HOME/kpy${PYTHONPATH:+:$PYTHONPATH}"

# --- Per-platform: LSan suppressions + shared library search path -------------
# The shared library path deliberately includes ONLY Klammertext's own .so dirs,
# NOT third-party bundled-library dirs. In particular NVIDIA iray's platforms/
# ships its own libfreetype.so and Qt6; if added here they shadow the system
# libraries, and iray's freetype drags in unversioned libharfbuzz.so/libbz2.so
# (absent without -dev packages), which breaks `import OpenImageIO` (SKS @image).
# Machine-specific library paths (iray included) go in runtime.env.local.
if [ "$_kt_uname" = "Darwin" ]; then
    # macOS: no LD/DYLD_LIBRARY_PATH needed — libklammertext.so is found via the
    # binaries' @loader_path rpath and document.so is dlopen'd by absolute path.
    # LeakSanitizer is unsupported on macOS, so LSAN_OPTIONS does not apply.
    :
else
    # LSan suppressions for unactionable libpython/OpenImageIO leaks (see
    # lsan.supp). Real leaks in Klammertext code are still reported; no effect
    # in performance builds (OPTIMIZE=1, which disables ASan).
    export LSAN_OPTIONS="suppressions=$KLAMMERTEXT_HOME/env/lsan.supp:print_suppressions=0"
    export LD_LIBRARY_PATH="$KLAMMERTEXT_HOME/mac:$KLAMMERTEXT_HOME/sks/kutil:$KLAMMERTEXT_HOME/sks/document:$KLAMMERTEXT_HOME/doc/handbook${LD_LIBRARY_PATH:+:$LD_LIBRARY_PATH}"
fi
unset _kt_uname

# --- The mdpdf command (Markdown -> PDF; sks/tns/mdpdf.sh) --------------------
# Sourced here rather than left to each user's profile, so the command exists
# wherever the rest of the Klammertext environment does. The file defines one
# shell function and registers completion for it: POSIX shell, no output, and
# harmless in a non-interactive shell.
if [ -f "$KLAMMERTEXT_HOME/sks/tns/mdpdf.sh" ]; then
    . "$KLAMMERTEXT_HOME/sks/tns/mdpdf.sh"
fi

# --- Optional per-machine escape hatch (gitignored, absent by default) ---------
# Use an if-block (not `[ -f ] && .`) so that when the local file is absent this
# file's final exit status is 0 -- otherwise `source runtime.env` returns
# non-zero, breaking `source runtime.env && ...` and `set -e` callers.
if [ -f "$KLAMMERTEXT_HOME/env/runtime.env.local" ]; then
    . "$KLAMMERTEXT_HOME/env/runtime.env.local"
fi