Initial Project Setup / Documentation, API (Doxygen)

Doxygen software processes code comments to create API documentation that is useful for developers. Doxygen can also be used to create graphs showing how code modules are connected. The output of Doxygen is not intended to be saved in the repository but might be distributed and archived, similar to model executables.

This documentation includes the following sections:

• Prerequisites
• Create Doxygen Project
• Review Doxygen Project File
• Run Doxygen
• Create .gitignore File

Prerequisites

Configuring a Doxygen project requires that the Doxygen software was previously installed, including the GraphViz software.

Create Doxygen Project

Run the Doxywizard interactively from the Start menu. Fill out the project settings as shown below.

• Working directory: doc-doxygen-project - in the repository
• Project name: StateCU - will be shown in HTML output
• Project synopsis: CDSS consumptive use model - will be shown in HTML output
• Project version or id: 13 - corresponds to StateCU version - will be shown in output
• Source code directory: src/main/fortran in repository
• Destination directory: doc-doxygen-project/output - use .gitignore to ignore in repository

The Expert tab appears to be a direct way to set various properties. Ignore for now.

Save the settings using File / Save menu and save to the doc-doxygen-project folder as Doxyfile default name.

Review Doxygen Project File

The Doxyfile is a long file with many settings. See the following information that explains important settings for Fortran:

• Callgraph for Fortran with Doxygen

The following settings are important:

OPTIMIZE_FOR_FORTRAN = YES
EXTRACT_ALL = YES
EXTRACT_PRIVATE = YES
EXTRACT_STATIC = YES
HAVE_DOT = YES (see section for GraphViz install)
CALL_GRAPH = YES
CALLER_GRAPH = YES
DOT_PATH = "C:\Program Files (x86)\Graphviz2.38\bin\dot.exe"

TODO smalers 2017-01-01 maybe also set EXTRACT_PACKAGE = YES?

If the file is edited and saved, reselect in the Doxywizard software using File / Open recent and then rerun Doxygen.

Run Doxygen

Try running by using the Run doxygen button under the Run tab.

The HTML output can be viewed as doc-doxygen-project/output/index.html. If the output is complete (for example no graphs shown) and/or errors are shown in the wizard, check the configuration file as discussed in the previous section and follow instructions in the error message, such as deleting the output folder and rerunning. An example of output is shown below.

TODO smalers 2017-01-02 need to decide whether to add target to makefile to auto-geneate in batch mode.

Create .gitignore File

A .gitignore file is created in the doc-doxygen-project folder to ignore the output folder.

TODO smalers 2017-01-02 need to decide whether to distribute documentation outside of developer environment or just let developers create for their own use as needed.