P.R.N. (As the circumstance arises)by Read Write Tools
|The prorenata build tool is used to execute a sequence of commands on a hierarchy of file paths, using parameters that are defined with a declarative approach, rather than a procedural approach.|
make command is the inspiration for prorenata.
Building, testing and deploying software requires a sequence a steps which need to be followed each time a file or one of its dependencies changes. In most cases, these steps should be conditioned on file timestamps, where a step should only be redone when the output of its previous execution is older than the corresponding input file's timestamp. In other words, only execute the step on an as needed basis.
The name of this utility comes from nursing jargon prorenata (p.r.n.) which means "as the circumstance arises".
Prerequisites and installation
The prorenata utility uses Node.js. Package installation is done via NPM.
This utility requires the BLUE-PHRASE parser, which is distributed with each copy of validly licensed Read Write Tools premium tools.
To install the utility and make it available to your Bash shell, use this command.
[user@host]# npm install -g prorenata
The software is invoked from the command line with:
[user@host]# renata [script-file]
The script file contains commands in this form:
There are 6 built-in commands:
copyrecursively copies all files in <source> to <dest>
comparelists files that are in <source> but not in <dest>
cleanremoves <dependent> files that are older than <trigger>
recurseruns a template-defined command recursively over all files in <source>
runexecutes an arbitrary shell command
templatedefines new commands for use with the <exec> parameter of
Any name that does not match one of these 6 is considered to be a user-defined command, and it may be used as a command in a
The are 15 built-in parameters:
sourcean absolute or relative path
destan absolute or relative path
include+a file pattern to include, if omitted defaults to '*'
exclude+a file pattern to exclude
extensionthe filename extension to apply to destination filenames
execa command name defined in the
always | older | never‡
true‡ | false(create missing directories)
true | false‡(preserve timestamps)
triggeran absolute or relative filename
dependent+an absolute or relative path
sh+a shell command to execute
if [hostname ==] | [hostname !=] then ... else ...
verbose | regular‡ | none
continue | halt‡
+ parameter that may be provided multiple times
‡ optional parameter default value
Any name that does not match one of these 15 is considered to be a user-defined parameter. Both built-in and user-defined parameters may be used as substitution variables in a template.
The parameters that may be used with each command are:
|copy||source* | dest* | include | exclude | extension | overwrite | mkdir | preserve | progress | onerror|
|compare||source* | dest* | include | exclude | extension | onerror|
|clean||trigger* | dependent* | progress | onerror|
|recurse||source* | exec* | include | exclude | extension | overwrite | mkdir | progress | dest | onerror|
|run||sh | if | progress | onerror|
* required parameter
A pair of less-than and greater-than characters are used to enclose a named substitution variable. Use substitutions with
compare commands. Place substitution variables in a template, and the current path or filename will be substituted.
The substitution variables:
|source||The absolute path and filename of the current source file|
|sourcepath||The local path of the current source file|
|sourcefile||The current source filename only|
|dest||The absolute path and filename of the current dest file|
|destpath||The local path of the current dest file|
|destfile||The current dest filename only|
Here is an example using
copy to recursively copy files with *.html extension from 'foo' to 'bar'
Here is an example using
recurse to compile LESS into CSS from 'foo' to 'bar'
compile-css lessc <source> <dest>
Here is an example using
template and a user-defined command to count the number of files in 'foo' with an 'html' extension
count-by-ext ls -l <path> | grep <ext> | wc -l
The prorenata command line utility is licensed under the MIT License.
Copyright © 2020 Read Write Tools.
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
|Documentation||Read Write Hub|