Add a target to generate Doxygen documentation

Relates to #95

Customizations for PHP/Shaarli:
 - add project information
 - index PHP files
 - index global functions
 - exclude directories

Usage
 $ make doxygen
 $ firefox doxygen/index.html &

Notes
 - classes can be found under "Data Structures"
 - global functions can be found under "Files > Globals > Functions"

Signed-off-by: VirtualTam <virtualtam@flibidi.net>

3 files changed, 48 insertions, 28 deletions

diff --git a/.gitignore b/.gitignore
index 5a6b9241..b98c38b9 100644
--- a/.gitignore
+++ b/.gitignore
@@ -16,8 +16,9 @@ pagecache
 composer.lock
 /vendor/
 
-# Ignore test data & output
+# Ignore development and test resources
 coverage
+doxygen
 tests/datastore.php
 tests/dummycache/
 phpmd.html
diff --git a/Doxyfile b/Doxyfile
index 55e51692..9a596b53 100644
--- a/Doxyfile
+++ b/Doxyfile
@@ -32,7 +32,7 @@ DOXYFILE_ENCODING      = UTF-8
 # title of most generated pages and in a few other places.
 # The default value is: My Project.
 
-PROJECT_NAME           = "My Project"
+PROJECT_NAME           = Shaarli
 
 # The PROJECT_NUMBER tag can be used to enter a project or revision number. This
 # could be handy for archiving the generated documentation or if some version
@@ -44,21 +44,21 @@ PROJECT_NUMBER         =
 # for a project that appears at the top of each page and should give viewer a
 # quick idea about the purpose of the project. Keep the description short.
 
-PROJECT_BRIEF          =
+PROJECT_BRIEF          = "The personal, minimalist, super-fast, no-database delicious clone"
 
 # With the PROJECT_LOGO tag one can specify a logo or an icon that is included
 # in the documentation. The maximum height of the logo should not exceed 55
 # pixels and the maximum width should not exceed 200 pixels. Doxygen will copy
 # the logo to the output directory.
 
-PROJECT_LOGO           =
+PROJECT_LOGO           = images/logo.png
 
 # The OUTPUT_DIRECTORY tag is used to specify the (relative or absolute) path
 # into which the generated documentation will be written. If a relative path is
 # entered, it will be relative to the location where doxygen was started. If
 # left blank the current directory will be used.
 
-OUTPUT_DIRECTORY       =
+OUTPUT_DIRECTORY       = .
 
 # If the CREATE_SUBDIRS tag is set to YES then doxygen will create 4096 sub-
 # directories (in 2 levels) under the output directory of each output format and
@@ -118,7 +118,17 @@ REPEAT_BRIEF           = YES
 # the entity):The $name class, The $name widget, The $name file, is, provides,
 # specifies, contains, represents, a, an and the.
 
-ABBREVIATE_BRIEF       =
+ABBREVIATE_BRIEF       = "The $name class" \
+                         "The $name widget" \
+                         "The $name file" \
+                         is \
+                         provides \
+                         specifies \
+                         contains \
+                         represents \
+                         a \
+                         an \
+                         the
 
 # If the ALWAYS_DETAILED_SEC and REPEAT_BRIEF tags are both set to YES then
 # doxygen will generate a detailed section even if there is only a brief
@@ -242,7 +252,7 @@ TCL_SUBST              =
 # members will be omitted, etc.
 # The default value is: NO.
 
-OPTIMIZE_OUTPUT_FOR_C  = NO
+OPTIMIZE_OUTPUT_FOR_C  = YES
 
 # Set the OPTIMIZE_OUTPUT_JAVA tag to YES if your project consists of Java or
 # Python sources only. Doxygen will then generate output that is more tailored
@@ -409,25 +419,25 @@ LOOKUP_CACHE_SIZE      = 0
 # normally produced when WARNINGS is set to YES.
 # The default value is: NO.
 
-EXTRACT_ALL            = NO
+EXTRACT_ALL            = YES
 
 # If the EXTRACT_PRIVATE tag is set to YES, all private members of a class will
 # be included in the documentation.
 # The default value is: NO.
 
-EXTRACT_PRIVATE        = NO
+EXTRACT_PRIVATE        = YES
 
 # If the EXTRACT_PACKAGE tag is set to YES, all members with package or internal
 # scope will be included in the documentation.
 # The default value is: NO.
 
-EXTRACT_PACKAGE        = NO
+EXTRACT_PACKAGE        = YES
 
 # If the EXTRACT_STATIC tag is set to YES, all static members of a file will be
 # included in the documentation.
 # The default value is: NO.
 
-EXTRACT_STATIC         = NO
+EXTRACT_STATIC         = YES
 
 # If the EXTRACT_LOCAL_CLASSES tag is set to YES, classes (and structs) defined
 # locally in source files will be included in the documentation. If set to NO,
@@ -443,7 +453,7 @@ EXTRACT_LOCAL_CLASSES  = YES
 # included.
 # The default value is: NO.
 
-EXTRACT_LOCAL_METHODS  = NO
+EXTRACT_LOCAL_METHODS  = YES
 
 # If this flag is set to YES, the members of anonymous namespaces will be
 # extracted and appear in the documentation as a namespace called
@@ -452,7 +462,7 @@ EXTRACT_LOCAL_METHODS  = NO
 # are hidden.
 # The default value is: NO.
 
-EXTRACT_ANON_NSPACES   = NO
+EXTRACT_ANON_NSPACES   = YES
 
 # If the HIDE_UNDOC_MEMBERS tag is set to YES, doxygen will hide all
 # undocumented members inside documented classes or files. If set to NO these
@@ -498,14 +508,14 @@ INTERNAL_DOCS          = NO
 # and Mac users are advised to set this option to NO.
 # The default value is: system dependent.
 
-CASE_SENSE_NAMES       = YES
+CASE_SENSE_NAMES       = NO
 
 # If the HIDE_SCOPE_NAMES tag is set to NO then doxygen will show members with
 # their full class and namespace scopes in the documentation. If set to YES, the
 # scope will be hidden.
 # The default value is: NO.
 
-HIDE_SCOPE_NAMES       = NO
+HIDE_SCOPE_NAMES       = YES
 
 # If the HIDE_COMPOUND_REFERENCE tag is set to NO (default) then doxygen will
 # append additional text to a page's title, such as Class Reference. If set to
@@ -654,7 +664,7 @@ SHOW_FILES             = YES
 # Folder Tree View (if specified).
 # The default value is: YES.
 
-SHOW_NAMESPACES        = YES
+SHOW_NAMESPACES        = NO
 
 # The FILE_VERSION_FILTER tag can be used to specify a program or script that
 # doxygen should invoke to get the current version for each file (typically from
@@ -758,7 +768,7 @@ WARN_LOGFILE           =
 # spaces.
 # Note: If this tag is empty the current directory is searched.
 
-INPUT                  =
+INPUT                  = .
 
 # This tag can be used to specify the character encoding of the source files
 # that doxygen parses. Internally doxygen uses the UTF-8 encoding. Doxygen uses
@@ -778,13 +788,13 @@ INPUT_ENCODING         = UTF-8
 # *.md, *.mm, *.dox, *.py, *.f90, *.f, *.for, *.tcl, *.vhd, *.vhdl, *.ucf,
 # *.qsf, *.as and *.js.
 
-FILE_PATTERNS          =
+FILE_PATTERNS          = *.php
 
 # The RECURSIVE tag can be used to specify whether or not subdirectories should
 # be searched for input files as well.
 # The default value is: NO.
 
-RECURSIVE              = NO
+RECURSIVE              = YES
 
 # The EXCLUDE tag can be used to specify files and/or directories that should be
 # excluded from the INPUT source files. This way you can easily exclude a
@@ -793,14 +803,18 @@ RECURSIVE              = NO
 # Note that relative paths are relative to the directory from which doxygen is
 # run.
 
-EXCLUDE                =
+EXCLUDE                = vendor \
+                         tpl \
+                         inc \
+                         doc \
+                         tmp
 
 # The EXCLUDE_SYMLINKS tag can be used to select whether or not files or
 # directories that are symbolic links (a Unix file system feature) are excluded
 # from the input.
 # The default value is: NO.
 
-EXCLUDE_SYMLINKS       = NO
+EXCLUDE_SYMLINKS       = YES
 
 # If the value of the INPUT tag contains directories, you can use the
 # EXCLUDE_PATTERNS tag to specify one or more wildcard patterns to exclude
@@ -833,7 +847,7 @@ EXAMPLE_PATH           =
 # *.h) to filter out the source-files in the directories. If left blank all
 # files are included.
 
-EXAMPLE_PATTERNS       =
+EXAMPLE_PATTERNS       = *
 
 # If the EXAMPLE_RECURSIVE tag is set to YES then subdirectories will be
 # searched for input files to be used with the \include or \dontinclude commands
@@ -907,7 +921,7 @@ USE_MDFILE_AS_MAINPAGE =
 # also VERBATIM_HEADERS is set to NO.
 # The default value is: NO.
 
-SOURCE_BROWSER         = NO
+SOURCE_BROWSER         = YES
 
 # Setting the INLINE_SOURCES tag to YES will include the body of functions,
 # classes and enums directly into the documentation.
@@ -1023,7 +1037,7 @@ GENERATE_HTML          = YES
 # The default directory is: html.
 # This tag requires that the tag GENERATE_HTML is set to YES.
 
-HTML_OUTPUT            = html
+HTML_OUTPUT            = doxygen
 
 # The HTML_FILE_EXTENSION tag can be used to specify the file extension for each
 # generated HTML page (for example: .htm, .php, .asp).
@@ -1370,7 +1384,7 @@ DISABLE_INDEX          = NO
 # The default value is: NO.
 # This tag requires that the tag GENERATE_HTML is set to YES.
 
-GENERATE_TREEVIEW      = NO
+GENERATE_TREEVIEW      = YES
 
 # The ENUM_VALUES_PER_LINE tag can be used to set the number of enum values that
 # doxygen will group on one line in the generated HTML documentation.
@@ -1558,7 +1572,7 @@ EXTRA_SEARCH_MAPPINGS  =
 # If the GENERATE_LATEX tag is set to YES, doxygen will generate LaTeX output.
 # The default value is: YES.
 
-GENERATE_LATEX         = YES
+GENERATE_LATEX         = NO
 
 # The LATEX_OUTPUT tag is used to specify where the LaTeX docs will be put. If a
 # relative path is entered the value of OUTPUT_DIRECTORY will be put in front of
@@ -1999,7 +2013,7 @@ EXPAND_AS_DEFINED      =
 # The default value is: YES.
 # This tag requires that the tag ENABLE_PREPROCESSING is set to YES.
 
-SKIP_FUNCTION_MACROS   = YES
+SKIP_FUNCTION_MACROS   = NO
 
 #---------------------------------------------------------------------------
 # Configuration options related to external references
@@ -2064,7 +2078,7 @@ PERL_PATH              = /usr/bin/perl
 # powerful graphs.
 # The default value is: YES.
 
-CLASS_DIAGRAMS         = YES
+CLASS_DIAGRAMS         = NO
 
 # You can define message sequence charts within doxygen comments using the \msc
 # command. Doxygen will then run the mscgen tool (see:
diff --git a/Makefile b/Makefile
index 770dcd53..c560d8d1 100644
--- a/Makefile
+++ b/Makefile
@@ -120,6 +120,11 @@ test:
 clean:
         @git clean -df
 
+### generate Doxygen documentation
+doxygen: clean
+        @rm -rf doxygen
+        @( cat Doxyfile ; echo "PROJECT_NUMBER=`git describe`" ) | doxygen -
+
 ### update the local copy of the documentation
 doc: clean
         @rm -rf doc