# Klammertext source installation on Linux (Ubuntu / Pop!_OS)

This document describes how to build and install Klammertext from source on a
Linux system — Ubuntu or Pop!_OS; the steps are identical — without using the
container. A source installation gives full access to all `@eval` modes,
including `:haskell` and `:shell` commands that depend on locally installed
software.

For the container installation on Linux, see `linux_container_install.md`.


## Prerequisites

The following packages are required to build Klammertext:

```bash
sudo apt-get update
sudo apt-get install g++ make python3-dev
```

The C++ compiler must support C++20. GCC 11 or later is required (Ubuntu 22.04
and later include GCC 12+).

The SKS `@image` klammer requires OpenImageIO Python bindings. These must match
the Python version that ktext is built against (check with
`python3.XX -c "import OpenImageIO"`). For example, if ktext links against
Python 3.12:

```bash
pip3.12 install OpenImageIO
```

Verify:

```bash
g++ --version
```


## Clone the repository

```bash
git clone https://git.andykopra.com/ack/klammertext.git
cd klammertext
```


## Environment variables

Klammertext's runtime environment is provided by a single self-configuring
file. Source it from your shell profile (e.g., `~/.bashrc` or `~/.zshrc`):

```bash
source /path/to/klammertext/mac/env/runtime.env
```

It self-locates `KLAMMERTEXT_HOME` from its own path, adds `bin/` and
`tst/` to `PATH` (plus the newest `~/external/texlive/<year>/bin/<arch>` if a
TeX Live is installed there), sets `LD_LIBRARY_PATH` so `libklammertext.so` is
found, and sets the LSan suppressions. There is no per-host or per-OS variable
to set. For a TeX Live or library in a non-standard location, add it to an
optional, gitignored `mac/env/runtime.env.local` (sourced at the end).

After editing your shell profile, reload it:

```bash
source ~/.bashrc
```


## Configure the build

No build configuration is needed. The single `mac/env/makefile.env` is
cross-platform: it reads `KLAMMERTEXT_HOME` from the environment (set by
`runtime.env` above), auto-detects the platform with `uname`, and auto-detects
Python with `python3-config` — no hardcoded version and no per-host file to
edit. Verify the Python development headers are present:

```bash
python3-config --includes    # prints -I.../python3.XX for your Python
```

If `python3-config` is missing, install your distribution's `python3-dev`
(Debian/Ubuntu) or `python3-devel` (Fedora/RHEL) package.


## Build

Build the shared library, the SKS components, and the three commands with a
single command: `make -C com` builds its prerequisites in `mac/` and `sks/`
first, then the commands. The build is optimized (`-O3`) by default — the build
you want to install and run:

```bash
make -C com -j        # lib/libklammertext.so + sks/*.so + bin/{ktext,kdesc,kdiag}
```

(For a slower `-O0` debug build with AddressSanitizer, intended for development,
prefix `DEBUG=1`: `DEBUG=1 make -C com -j`.)

Verify the build:

```bash
ktext -s '@eval 1 + 1 @' -d
```

This should print `2`. For a quick document smoke test, create a small file and
render it to HTML:

```bash
cat > hello.kt <<'EOF'
@document
:structure article
:title Hello
:text
@s1 Hello, Klammertext @

This document was built from source.
@
EOF
ktext hello.kt -t html          # writes hello/index.html
```


## TeX Live (for PDF output)

The Standard Klammer Set uses **XeLaTeX** for the `pdf` target. Build a complete
Klammertext TeX Live tree with the bundled script, giving it a destination
directory under `~/external/texlive/<year>` — the location `runtime.env`
auto-detects. The script needs `perl`, `xz-utils`, `fontconfig`, and either
`wget` or `curl`:

```bash
sudo apt-get install perl wget xz-utils fontconfig
bash $KLAMMERTEXT_HOME/doc/install/texlive_additional_packages.sh ~/external/texlive/2026
```

This installs `scheme-small` plus the additional packages the SKS needs and
rebuilds all formats, fetching the binaries for your architecture. It writes a
`KLAMMERTEXT_BUILD_INFO.txt` provenance file (mirror, release, package list,
date) into the tree.

Because the tree lives under `~/external/texlive/2026`, `runtime.env` finds it
automatically — open a new shell (or re-source `runtime.env`) and `xelatex`
will be on `PATH`. No manual `KLAMMERTEXT_TEXLIVE_BIN` is needed.

If you would rather reuse a TeX Live you already have, point `runtime.env` at it
from the gitignored escape hatch instead, and install the SKS's extra packages
into it yourself (the package list is in `doc/install/texlive_additional_packages.sh`):

```bash
cat >> "$KLAMMERTEXT_HOME/mac/env/runtime.env.local" <<'EOF'
export KLAMMERTEXT_TEXLIVE_BIN=/path/to/texlive/bin/x86_64-linux
export PATH="$KLAMMERTEXT_TEXLIVE_BIN:$PATH"
EOF
```

Verify and test (reusing the `hello.kt` from the Build section):

```bash
xelatex --version
ktext hello.kt -t pdf           # writes hello.pdf
```


## Optional: Haskell (for @eval :haskell)

The `@eval :haskell` mode requires `runghc`, which is part of the Haskell
toolchain. Alternatively, the `akopra/klammertext:haskell` container image
includes GHC (see `linux_container_install.md`).

The recommended way to install Haskell on Ubuntu is via ghcup:

```bash
curl --proto '=https' --tlsv1.2 -sSf https://get-ghcup.haskell.org | sh
```

Follow the prompts to install GHC, cabal, and related tools. After
installation, ensure the ghcup bin directory is in your `PATH`:

```bash
export PATH=$HOME/.ghcup/bin:$PATH
```

Verify:

```bash
runghc --version
```

Test in Klammertext:

```bash
ktext -s '@eval :haskell main = putStr "Hello from Haskell" @' -d
```


## Directory layout after build

```
klammertext/
├── bin/          ktext, kdesc, kdiag executables (after build)
├── lib/          libklammertext.so shared library (after build)
├── mac/          Klammermachine C++ source
├── sks/          Standard Klammer Set (.k files and .so modules)
│   ├── document/ document.so
│   ├── kutil/    kutil.o
│   └── target/   html_util.o, latex_util.o
├── com/          command source (ktext, kdesc, kdiag) and Makefile
├── doc/          installation guides (doc/install) and editor support (doc/edit)
└── tst/          test suites
```


## Verifying the installation

Run the following commands to verify that everything works:

```bash
# Basic evaluation (Python)
ktext -s '@eval 1 + 1 @' -d

# Shell evaluation
ktext -s '@eval :shell date @' -d

# Show machine state (SKS is loaded by default)
ktext -s '' -m

# HTML and PDF output (uses the hello.kt from the Build section)
ktext hello.kt -t html
ktext hello.kt -t pdf     # requires TeX Live

# Haskell evaluation (requires ghcup)
ktext -s '@eval :haskell main = putStr "42" @' -d

# Run unit tests
make -C $KLAMMERTEXT_HOME/tst test
```


## Updating

To update an existing source installation to the latest version:

```bash
cd $KLAMMERTEXT_HOME
git pull
make -C com -j             # rebuild library, SKS components, and commands (optimized)
```

The TeX Live tree only needs rebuilding if the SKS's package requirements
changed (rare); when they do, re-run the script from the TeX Live section
above.

## Troubleshooting

**"libklammertext.so: cannot open shared object file"**
Ensure `LD_LIBRARY_PATH` includes `$KLAMMERTEXT_HOME/lib`:

```bash
export LD_LIBRARY_PATH=$KLAMMERTEXT_HOME/lib:$LD_LIBRARY_PATH
```

**"KLAMMERTEXT_HOME is not set"**
Set the environment variable as described in the Environment variables
section above.

**"python3.XX/Python.h: No such file or directory"**
Install the Python development headers:

```bash
sudo apt-get install python3-dev
```

**"xelatex: command not found" (when using -t pdf)**
Install TeX Live and ensure its bin directory is in `PATH`.

**"@eval :haskell requires runghc"**
Install Haskell via ghcup as described in the Optional: Haskell section.