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;;; ccwl --- Concise Common Workflow Language
;;; Copyright © 2021 Arun Isaac <arunisaac@systemreboot.net>
;;;
;;; This file is part of ccwl.
;;;
;;; ccwl is free software: you can redistribute it and/or modify it
;;; under the terms of the GNU General Public License as published by
;;; the Free Software Foundation, either version 3 of the License, or
;;; (at your option) any later version.
;;;
;;; ccwl is distributed in the hope that it will be useful, but
;;; WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
;;; General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with ccwl. If not, see <https://www.gnu.org/licenses/>.
;;; Commentary:
;; This file implements conversion from ccwl objects (<workflow>,
;; <command>, <input>, <output>, <step>) to the graphviz dot language.
;;; Code:
(define-module (ccwl graphviz)
#:use-module (srfi srfi-1)
#:use-module (srfi srfi-9 gnu)
#:use-module (srfi srfi-26)
#:use-module (srfi srfi-28)
#:use-module (ice-9 match)
#:use-module (ccwl ccwl)
#:use-module (ccwl utils)
#:export (workflow->dot))
(define (workflow->dot workflow port)
"Render WORKFLOW, a <workflow> object, to PORT in the graphviz dot
language."
(graph->dot (workflow->graph workflow)
port))
(define-immutable-record-type <graph>
(make-graph name properties nodes edges subgraphs)
graph?
(name graph-name)
(properties graph-properties)
(nodes graph-nodes)
(edges graph-edges)
(subgraphs graph-subgraphs))
(define* (graph name #:key (properties '()) (nodes '()) (edges '()) (subgraphs '()))
"Construct <graph> object."
(make-graph name properties nodes edges subgraphs))
(define-immutable-record-type <graph-node>
(make-graph-node name properties)
graph-node?
(name graph-node-name)
(properties graph-node-properties))
(define* (graph-node name #:optional (properties '()))
"Construct <graph-node> object."
(make-graph-node name properties))
(define (workflow->graph workflow)
"Convert WORKFLOW, a <workflow> object, to a <graph> object."
(graph 'workflow
#:properties '((bgcolor . "#eeeeee"))
#:nodes (map (lambda (step)
(graph-node (step-id step)
'((fillcolor . "lightgoldenrodyellow")
(shape . "record")
(style . "filled"))))
(workflow-steps workflow))
#:edges (append
;; Connect steps and inputs to steps.
(append-map (lambda (step)
(map (match-lambda
((_ . address)
(cons (string->symbol
(match (string-split address #\/)
((step _) step)
((workflow-input) workflow-input)))
(step-id step))))
(step-in step)))
(workflow-steps workflow))
;; Connect output sources to outputs.
(map (lambda (output)
(cons (match (string-split (output-source output) #\/)
((source _) source))
(output-id output)))
(workflow-outputs workflow)))
#:subgraphs (list (graph 'cluster_inputs
#:properties '((label . "Workflow Inputs")
(rank . "same")
(style . "dashed"))
#:nodes (map (lambda (input)
(graph-node (input-id input)
'((fillcolor . "#94ddf4")
(shape . "record")
(style . "filled"))))
(workflow-inputs workflow)))
(graph 'cluster_outputs
#:properties '((label . "Workflow Outputs")
(labelloc . "b")
(rank . "same")
(style . "dashed"))
#:nodes (map (lambda (output)
(graph-node (output-id output)
'((fillcolor . "#94ddf4")
(shape . "record")
(style . "filled"))))
(workflow-outputs workflow))))))
(define (escape-id id)
"Escape string ID if necessary according to graphviz dot syntax."
(let ((id (if (symbol? id)
(symbol->string id)
id)))
(if (string-every (char-set-union (char-set-intersection char-set:letter+digit
char-set:ascii)
(char-set #\_))
id)
id
(call-with-output-string
(cut write id <>)))))
(define* (graph->dot graph #:optional (port (current-output-port)) (level 0))
"Render GRAPH, a <graph> object, in the graphviz dot syntax to
PORT."
(indent-level port level)
(display (format "~a ~a {~%"
(if (zero? level) "digraph" "subgraph")
(graph-name graph))
port)
(for-each (match-lambda
((key . value)
(indent-level port (1+ level))
(display (format "~a=~a;~%" key (escape-id value)) port)))
(graph-properties graph))
(for-each (lambda (node)
(indent-level port (1+ level))
(display (escape-id (graph-node-name node)) port)
(unless (null? (graph-node-properties node))
(display (format " [~a]"
(string-join (map (match-lambda
((key . value)
(format "~a=~a" key (escape-id value))))
(graph-node-properties node))
", "))
port))
(display (format ";~%") port))
(graph-nodes graph))
(for-each (match-lambda
((from . to)
(indent-level port (1+ level))
(display (format "~a -> ~a;~%"
(escape-id from)
(escape-id to))
port)))
(graph-edges graph))
(for-each (lambda (subgraph)
(graph->dot subgraph port (1+ level)))
(graph-subgraphs graph))
(indent-level port level)
(display (format "}~%") port))
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