Blame Manual/Directories/trunk/Scripts/Functions/Svg.texi

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@subsection Goals
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This section exists to organize files related to @code{svg}
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functionality of @file{centos-art.sh} script.
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@subsection Description
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The @code{svg} functionality of @file{centos-art.sh} script helps you
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to maintain scalable vector graphics (SVG) inside repository. For
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example, suppose you've been working in CentOS default design models
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under @file{trunk/Identity/Themes/Models/}, and you want to set common
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metadata to all of them, and later remove all unused SVG defintions
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from @samp{*.svg} files. Doing so file by file may be a tedious task,
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so the @file{centos-art.sh} script provides the @code{svg}
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functionality to aid you maintain such actions.
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@cindex Metadata maintainance
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@subsubsection Metadata maintainance
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The metadata used is defined by Inkscape 0.46 using the SVG standard
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markup. The @file{centos-art.sh} script replaces everything
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in-between @code{<metadata} and @code{</metadata>} tags with a
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predefined metadata template we've set for this purpose.
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The metadata template was created using the metadata information of a
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file which, using Inkscape 0.46, all metadata fields were set. This
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created a complete markup representation of how SVG metadata would
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look like. Later, we replaced every single static value with a
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translation marker in the form @samp{=SOMETEXT=}, where
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@code{SOMETEXT} is the name of its main opening tag. Later, we
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transform the metadata template into a sed replacement set of commads
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escaping new lines at the end of each line.
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With metadata template in place, the @file{centos-art.sh} script uses
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it to create a metadata template instance for the file being processed
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currently.  The metadata template instance contains the metadata
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portion of sed replacement commands with translation markers already
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traduced.  In this action, instance creation, is where we take
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advantage of automation and generate metadata values like title, date,
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keywords, source, identifier, and relation dynamically, based on the
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file path @file{centos-art.sh} script is currently creating metadata
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information for.
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With metadata template instance in place, the @file{centos-art.sh}
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script uses it to replace real values inside all @samp{.svg} files
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under the current location you're running the @file{centos-art.sh}
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script on.  Default behaviour is to ask user to enter each metadatum
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required, one by one. If user leaves metadatum empty, by pressing
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@key{RET} key, @file{centos-art.sh} uses its default value.
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The @file{centos-art.sh} script modifies the following metadata:
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@table @samp
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@item Title
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Name by which this document is formally known. If no value is set
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here, @file{centos-art.sh} script uses the file name as title.
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@item Date
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Date associated with the creation of this document (YYYY-MM-DD). If no
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value is set here, @file{centos-art.sh} script uses the current date
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information as in @command{date +%Y-%m-%d}.
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@item Creator
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Name of entity primarily responsible for making the content of this
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document. If no value is set here, @file{centos-art.sh} script uses
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the string @samp{The CentOS Project}.
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@item Rights
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Name of entity with rights to the intellectual Property of this
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document. If no value is set here, @file{centos-art.sh} script uses
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the string @samp{The CentOS Project}.
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@item Publisher
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Name of entity responsible for making this document available. If no
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value is set here, @file{centos-art.sh} script uses the string
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@samp{The CentOS Project}.
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@item Identifier
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Unique URI to reference this document. If no value is set here,
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@file{centos-art.sh} script uses the current file path to build the
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related url that points to current file location inside repository
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central server.
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@item Source
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Unique URI to reference the source of this document. If no value is
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set here, @file{centos-art.sh} script uses current file path to build
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the related url that points to current file location inside repository
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central server.
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@item Relation
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Unique URI to a related document. If no value is set here,
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@file{centos-art.sh} script uses current file path to build the
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related url that points to current file location inside repository
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central server.
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@item Language
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Two-letter language tag with optional subtags for the language of this
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document. (e.g. @samp{en-GB}). If no value is set here,
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@file{centos-art.sh} script uses the current locale information as in
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@code{cli_getCurrentLocale} function.
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@item Keywords
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The topic of this document as comma-separated key words, prhases, or
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classifications. If no value is set here, @file{centos-art.sh} script
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uses file path to build 
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@item Coverage
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Extent or scope of this document. If no value is set here,
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@file{centos-art.sh} script uses the string @samp{The CentOS Project}.
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@item Description
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Description about the document. If no value is set here,
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@file{centos-art.sh} script uses uses empty value as default.
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@item Contributors
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People that contributes in the creation/maintainance of the document.
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If no value is set here, @file{centos-art.sh} script uses uses empty
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value as default.
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@end table
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The @samp{License} metadatum is not set as a choise, by now. It is
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fixed @url{http://creativecommons.org/licenses/by-sa/3.0/, Creative
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Common Attribution Share-Alike 3.0 License}. This is done in order to
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grant license consistency among all SVG files we manage inside CentOS
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Artwork Repository.
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@cindex Unused definitions
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@subsubsection Unused definitions 
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Many of the no-longer-used gradients, patterns, and markers (more
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precisely, those which you edited manually) remain in the
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corresponding palettes and can be reused for new objects. However if
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you want to optimize your document, use the @samp{Vacuum Defs} command
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in @samp{File} menu. It will remove any gradients, patterns, or
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markers which are not used by anything in the document, making the
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file smaller. 
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If you have one or two couple of files, removing unused definitions
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using the graphical interface may be enough to you.  In contrast, if
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you have dozens or even houndreds of scalable vector graphics files to
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maintain it is not a fun task to use the graphical interface to remove
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unused definitions editing those files one by one.
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To remove unused definitions from several scalable vector graphics
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files, the @file{centos-art.sh} script uses Inkscape command-line
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interface, specifically with the @option{--vaccum-defs} option.
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@subsection Usage
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@table @command
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@item centos-art svg --update-metadata='path/to/dir'
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@item centos-art svg --update-metadata='path/to/dir' --filter='regex'
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Use these commands to update metadata information to @samp{.svg} files
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under @samp{path/to/dir} directory.
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@item centos-art svg --vacuum-defs='path/to/dir'
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@item centos-art svg --vacuum-defs='path/to/dir' --filter='regex'
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Use these commands to remove unused definitions inside @samp{.svg}
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files under @samp{path/to/dir} directory. 
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@end table
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When you provide @option{--filter='regex'} argument, the list of files
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to process is reduced as specified in @samp{regex} regular expression.
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Inside @file{centos-art.sh} script, the @samp{regex} regular
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expression is used in combination with @command{find} command to look
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for files matching the regular expression path pattern.
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@quotation
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@strong{Warning} In order for @samp{regex} regular expression to match
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a file, the @samp{regex} regular expresion must match the whole file
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path not just the file name. 
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@end quotation
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For example, if you want to match all @file{summary.svg} files inside
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@file{path/to/dir}, use the @code{.+/summary} regular expression.
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Later, @file{centos-art.sh} script uses this value inside
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@code{^$REGEX\.svg$} expression in order to build the final regular
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expression (i.e., @code{^.+/summary\.svg$}) that is evaluated against
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available file paths inside the list of files to process.
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Exceptionally, when you provide @option{--filter='regex'} in the way
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that @samp{regex}, appended to @samp{path/to/dir/} (i.e.
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@samp{path/to/dir/regex}), matches a regular file; the
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@file{centos-art.sh} script uses the file matching as only file in the
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list of files to process. 
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@subsection See also
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@menu
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* Directories trunk Scripts::
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@comment --- Removed(* Directories trunk Scripts Functions::) ---
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@end menu