More OpenSSL and documenation fun. No more words to say. (0.38.13)

docs/external/README.md

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+# External integrations (optional extensions)
+
+This section documents Fun’s optional, build‑time selectable extensions. Each page covers:
+- How to enable the extension via CMake option (FUN_WITH_*)
+- Build requirements and detection notes
+- Available opcodes and/or helper functions
+- Minimal usage examples and links to example scripts
+
+Extensions:
+
+- [cURL (libcurl)](./curl.md)
+- [INI (iniparser)](./ini.md)
+- [JSON (json-c)](./json.md)
+- [libxml2 (XML)](./xml2.md)
+- [SQLite](./sqlite.md)
+- [libSQL (SQLite-compatible)](./libsql.md)
+- [PCRE2 (Perl-compatible regex)](./pcre2.md)
+- [PC/SC (Smart cards)](./pcsc.md)
+- [Notcurses (TUI)](./notcurses.md)
+- [Tcl/Tk (GUI)](./tcltk.md)
+- [OpenSSL (MD5 helper)](./openssl.md)
+
+Notes:
+- These integrations are optional; the VM compiles without them.
+- When disabled, related builtins usually return empty strings/neutral values rather than fail hard, mirroring existing optionality patterns.

docs/external/curl.md

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+# cURL (libcurl) extension (optional)
+
+- CMake option: FUN_WITH_CURL=ON
+- Purpose: HTTP helpers using libcurl.
+- Homepage: https://curl.se/libcurl/
+
+Opcodes:
+- OP_CURL_GET: GET; pops url:string; pushes body:string (empty on error/disabled)
+- OP_CURL_POST: POST; pops body:string, url:string; pushes response:string
+- OP_CURL_DOWNLOAD: Download to file; pops path:string, url:string; pushes 1/0
+
+Notes:
+- Requires libcurl development headers/libs.
+- When disabled, helpers return empty strings/0 to match optional behavior.

docs/external/ini.md

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+# INI (iniparser) extension (optional)
+
+- CMake option: FUN_WITH_INI=ON
+- Purpose: Read/write simple INI configuration files.
+- Homepage: https://github.com/ndevilla/iniparser
+
+Opcodes:
+- OP_INI_LOAD: pops path; pushes handle (>0) or 0
+- OP_INI_FREE: pops handle; pushes 1/0
+- OP_INI_GET_STRING: pops def, key, section, handle; pushes string
+- OP_INI_GET_INT: pops def, key, section, handle; pushes int
+- OP_INI_GET_DOUBLE: pops def, key, section, handle; pushes float
+- OP_INI_GET_BOOL: pops def, key, section, handle; pushes 0/1
+- OP_INI_SET: pops value, key, section, handle; pushes 1/0
+- OP_INI_UNSET: pops key, section, handle; pushes 1/0
+- OP_INI_SAVE: pops path, handle; pushes 1/0
+
+Notes:
+- Requires iniparser development headers/libs.
+- When disabled, helpers return neutral values (0/empty strings) like other optional extensions.

docs/external/json.md

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+# JSON (json-c) extension (optional)
+
+- CMake option: FUN_WITH_JSON=ON
+- Purpose: JSON parse/stringify and file helpers via json-c.
+- Homepage: https://json-c.github.io/json-c/
+
+Opcodes:
+- OP_JSON_PARSE: pops text; pushes value or Nil on error
+- OP_JSON_STRINGIFY: pops pretty:int(0/1), value; pushes string
+- OP_JSON_FROM_FILE: pops path; pushes value or Nil
+- OP_JSON_TO_FILE: pops pretty:int(0/1), value, path; pushes 1/0
+
+Notes:
+- Requires json-c development headers/libs.
+- When disabled, functions push empty/neutral values similar to other optional modules.

docs/external/libsql.md

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+# libSQL extension (optional)
+
+- CMake option: FUN_WITH_LIBSQL=ON
+- Purpose: SQLite-compatible client using the libSQL (Turso) library.
+- Homepage: https://libsql.org/
+
+Opcodes:
+- OP_LIBSQL_OPEN: pops url_or_path; pushes handle (>0) or 0
+- OP_LIBSQL_CLOSE: pops handle; pushes Nil
+- OP_LIBSQL_EXEC: pops sql, handle; pushes rc:int (0=OK)
+- OP_LIBSQL_QUERY: pops sql, handle; pushes array<map>
+
+Notes:
+- Uses a SQLite-compatible C API provided by libSQL; behavior is similar to the SQLite backend.
+- This module is independent from the SQLite extension; you may enable either or both.

docs/external/notcurses.md

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+# Notcurses (TUI) extension (optional)
+
+- CMake option: FUN_WITH_NOTCURSES=ON
+- Purpose: Terminal UI capabilities via the Notcurses library.
+- Homepage: https://notcurses.com/
+
+Opcodes:
+- OP_NC_INIT: initialize Notcurses; returns 1 on success, 0 on failure
+- OP_NC_SHUTDOWN: shutdown; returns 0
+- OP_NC_CLEAR: clear screen/plane; returns 0
+- OP_NC_DRAW_TEXT: pops text, x, y; draws; returns 0
+- OP_NC_GETCH: pops timeout_ms; returns codepoint or -1 on timeout/error
+
+Notes:
+- Requires Notcurses development headers/libs.
+- Behavior may vary across terminals; see the implementation for details.

docs/external/openssl.md

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+# OpenSSL extension (optional)
+
+- CMake option: FUN_WITH_OPENSSL=ON
+- Purpose: provide small crypto helpers backed by OpenSSL. Includes md5, sha256, sha512 helpers.
+- Homepage: https://www.openssl.org/
+
+Build notes:
+- Requires system OpenSSL development headers and libraries.
+- On OpenSSL 3.x, legacy MD5_* APIs are deprecated; you may see warnings during build.
+
+Provided helper/opcodes:
+- Function: openssl_md5(data:string) -> string (lowercase hex). Falls back to empty string when the extension is disabled, mirroring other optional modules.
+- Function: openssl_sha256(data:string) -> string (lowercase hex).
+- Function: openssl_sha512(data:string) -> string (lowercase hex).
+- Opcodes: OP_OPENSSL_MD5, OP_OPENSSL_SHA256, OP_OPENSSL_SHA512 (internal mappings for the functions above).
+
+Quickstart:
+- Configure: cmake -S . -B build -DFUN_WITH_OPENSSL=ON
+- Build: cmake --build build --target fun
+- Run examples:
+  - ./build/fun examples/crypto/openssl_md5.fun
+  - ./build/fun examples/crypto/openssl_sha256.fun
+  - ./build/fun examples/crypto/openssl_sha512.fun
+
+Example output:
+- md5(abc) = 900150983cd24fb0d6963f7d28e17f72
+- md5("") = d41d8cd98f00b204e9800998ecf8427e
+- sha256(abc) = ba7816bf8f01cfea414140de5dae2223b00361a396177a9cb410ff61f20015ad
+- sha256("") = e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855
+- sha512(abc) = ddaf35a193617abacc417349ae20413112e6fa4e89a97ea20a9eeee64b55d39a2192992a274fc1a836ba3c23a3feebbd454d4423643ce80e2a9ac94fa54ca49f
+- sha512("") = cf83e1357eefb8bdf1542850d66d8007d620e4050b5715dc83f4a921d36ce9ce47d0d13c5d85f2b0ff8318d2877eec2f63b931bd47417a81a538327af927da3e

docs/external/pcre2.md

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+# PCRE2 (Perl-Compatible Regex) extension (optional)
+
+- CMake option: FUN_WITH_PCRE2=ON
+- Purpose: Advanced regular expressions via PCRE2.
+- Homepage: https://www.pcre.org/
+
+Opcodes:
+- OP_PCRE2_TEST: pops flags, text, pattern; pushes 1/0
+- OP_PCRE2_MATCH: pops flags, text, pattern; pushes match map or Nil
+- OP_PCRE2_FINDALL: pops flags, text, pattern; pushes array of match maps
+
+Notes:
+- Requires PCRE2 development headers/libs.
+- Flags are backend-specific; see implementation for supported bits.

docs/external/pcsc.md

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+# PC/SC (smart cards) extension (optional)
+
+- CMake option: FUN_WITH_PCSC=ON
+- Purpose: Access smart card readers/cards via PC/SC (pcsclite).
+- Homepage: https://pcsclite.apdu.fr/
+
+Opcodes:
+- OP_PCSC_ESTABLISH: returns context id (>0) or 0
+- OP_PCSC_RELEASE: pops ctx id; returns 1/0
+- OP_PCSC_LIST_READERS: pops ctx id; returns array of reader names
+- OP_PCSC_CONNECT: pops reader, ctx id; returns handle (>0) or 0
+- OP_PCSC_DISCONNECT: pops handle id; returns 1/0
+- OP_PCSC_TRANSMIT: pops apdu, handle id; returns map with data/SW/rc
+
+Notes:
+- Requires PC/SC lite development headers/libs.
+- Behavior and availability depend on platform and reader drivers.

docs/external/sqlite.md

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+# SQLite extension (optional)
+
+- CMake option: FUN_WITH_SQLITE=ON
+- Purpose: Access SQLite databases via the native C API.
+- Homepage: https://www.sqlite.org/
+
+Opcodes:
+- OP_SQLITE_OPEN: pops path; pushes handle (>0) or 0
+- OP_SQLITE_CLOSE: pops handle; pushes Nil
+- OP_SQLITE_EXEC: pops sql, handle; pushes rc:int (0=OK)
+- OP_SQLITE_QUERY: pops sql, handle; pushes array<map>
+
+Notes:
+- Requires SQLite development headers/libs.
+- See also: `libSQL` for a compatible alternative backend.

docs/external/tcltk.md

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+# Tcl/Tk (GUI) extension (optional)
+- CMake option: FUN_WITH_TCLTK=ON
+- Purpose: Basic GUI functionality via Tcl/Tk.
+- Homepage: https://www.tcl.tk/
+Opcodes:
+- OP_TK_EVAL: pops script string; pushes rc (0=OK)
+- OP_TK_RESULT: pushes last Tcl result string
+- OP_TK_LOOP: enters main event loop; pushes Nil when done
+- OP_TK_WM_TITLE: pops title string; sets window title; pushes rc
+- OP_TK_LABEL: pops text, id; creates/updates label .id; pushes rc
+- OP_TK_BUTTON: pops text, id; creates/updates button .id; pushes rc
+- OP_TK_PACK: pops id; packs .id; pushes rc
+- OP_TK_BIND: pops command, event, id; binds; pushes rc
+Notes:
+- Requires Tcl/Tk development headers/libs.
+- GUI behavior depends on your desktop environment/window manager.

docs/external/xml2.md

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+# XML (libxml2) extension (optional)
+
+- CMake option: FUN_WITH_XML2=ON
+- Purpose: Minimal XML parsing helpers using libxml2.
+- Homepage: http://xmlsoft.org/
+
+Opcodes:
+- OP_XML_PARSE: pops text; pushes doc handle (>0) or 0
+- OP_XML_ROOT: pops doc handle; pushes node handle (>0) or 0
+- OP_XML_NAME: pops node handle; pushes string (node name)
+- OP_XML_TEXT: pops node handle; pushes string (concatenated text)
+
+Notes:
+- Requires libxml2 development headers/libs.
+- On many systems, the include path is `/usr/include/libxml2`.