Tools/scripts: Add ai-master-prompt.md

This is WIP.
ai-master-prompt.md allows AI assistants like gemini (misc/gemini-cli)
to perform simple port operations.
Currently gemini, for example, can perform simple updates to
Python ports.

Tools/scripts/ai-master-prompt.md

@@ -0,0 +1,53 @@
+<!--
+ai-master-prompt.md: master prompt file for AI assistants to know how to perform
+                     various simple operations on ports and ports tree.
+                     AI assistants find it by using the .env file in the root of
+                     the repository, or by using relevant environment variables.
+                     For example, the Google's gemini AI assistant can use
+                     GEMINI_SYSTEM_MD to find this file.
+
+MAINTAINER: yuri@FreeBSD.org
+-->
+
+# Project Context: FreeBSD ports
+
+## General Instructions
+- Individual port directories are under category directories: {category}/{port directory}
+- In order to perform operations on an individual port you need to change directory into this port.
+- In every port's directory there is a Makefile.
+- WRKDIR of every port can be determined by the command 'make -V WRKDIR'
+- WRKSRC of every port can be determined by the command 'make -V WRKSRC'
+- When any port is updated, the distinfo file can be regenerated using the 'make makesum' command.
+- Any port can download and extract the source files using the 'make patch' command.
+- Working directory can be removed (cleaned) using the 'make clean' command.
+- PORTREVISION should be removed when DISTVERSION or PORTVERSION is updated.
+- Any FreeBSD package that is needed can be installed using the command 'sudo pkg install -A {package name}'.
+- In case if any work* directories are present in the port directory before the port update such directories should be removed by the 'make clean' command.
+- The USES variable in port's Makefile defines what type of port this is.
+  - When USES contains the word 'gmake' this is a port that is built using GNU Make (using the the gmake executable).
+  - When USES contains the word 'cmake' this is a port that is built using cmake.
+  - When USES contains the word 'python' this is a Python based port.
+  - When USES contains the word 'cargo' this is a Rust based port.
+  - When USES contains the word 'cabal' this is a Haskell based port.
+- Port uses GitHub to fetch distfiles if it has the USE_GITHUB=yes line.
+- Every port has a maintainer, maintainer's e-mail address in is the MAINTAINER field.
+
+### Instructions for ports that use GitHub to fetch distfiles
+- GitHub account name of such ports is in GH_ACCOUNT, or otherwise PORTNAME is used as an account name.
+- GitHub project name of such ports is in GH_PROJECT, or otherwise PORTNAME is used as a project name.
+- The GitHub git URL is constructed as https://github.com/{GH_ACCOUNT}/{GH_PROJECT}.git
+- The latest released version of a git URL can be determined using the command '../../Tools/scripts/git-get-latest-remote-version.sh {Git-URL} {DISTVERSIONPREFIX}'
+
+### Instructions for Python ports (ports that contain the python element in the USES line)
+- The latest released version of the software can be determined using the command '../../Tools/scripts/pypi-get-latest-version.sh {python project name}'
+- Dependencies need to be updated when the port is updated. They need to be compared with the dependency requirements set in the project.
+- setuptools build dependency should never be added to BUILD_DEPENDS, and instead the distutils element should be present in USE_PYTHON.
+- numpy dependency should be added as ${PYNUMPY} instead of the usual syntax. No version information should be added in this case.
+- pillow dependency should be added as ${PY_PILLOW} instead of the usual syntax. No version information should be added in this case.
+- The cython build dependency should never be added to BUILD_DEPENDS. Instead, the cython element should be added to USE_PYTHON for cython dependencies of versions 1.x or 2.x, and the cython3 element should be added to USE_PYTHON for cython dependencies of versions 3.x
+- Do not add upper version limits for Python based ports.
+- Always replace exact version comparison in dependencies with >=.
+
+### Instructions for Haskell based ports (ports that contain the python element in the USES line)
+- Directories of all Haskell ports have the prefix "hs-".
+- The latest released version of the software can be determined using the command '../../Tools/scripts/haskell-get-latest-version.sh {haskell project name}'