Add parameter to set template values directly

Note this also changes the separator character from semicolon to colon
for the `data-source` flag, as the colon is likely more common.

Closes #4.

build/docs/render.adoc

@@ -1,6 +1,6 @@
 The purpose of this task is to render a asciidoc template located in the repository into a PDF. In addition to just transforming the asciidoc file to PDF, the task is also able to render information gathered from YAML/JSON files (such as ODS Pipeline artifacts) into the asciidoc file before transforming it to PDF.
 
-The task expects a glob pattern pointing to one or more Go template files (given by parameter `template`). It renders each found Go template with data gathered from files matching the `data-sources` parameter, which defaults to `.ods/\*;.ods/repos/*/.ods/\*;.ods/artifacts/*/\*.json;.ods/artifacts/*/*.yaml`. The asciidoc template can then access data parsed from these files. For example, if file `.ods/artifacts/org.foo/some.json` contains:
+The task expects a glob pattern pointing to one or more Go template files (given by parameter `template`). It renders each found Go template with data gathered from files matching the `data-sources` parameter, which defaults to `.ods/\*,.ods/repos/*/.ods/\*,.ods/artifacts/*/\*.json,.ods/artifacts/*/*.yaml`. The asciidoc template can then access data parsed from these files. For example, if file `.ods/artifacts/org.foo/some.json` contains:
 
 ```
 {"a":"b"}

build/tasks/render.yaml

@@ -26,9 +26,16 @@ spec:
     - name: data-sources
       description: >-
         Glob patterns from where to source data.
-        Multiple glob patterns are separated by semicolons.
+        Multiple glob patterns are separated by colons.
       type: string
-      default: ".ods/*;.ods/repos/*/.ods/*;.ods/artifacts/*/*.json;.ods/artifacts/*/*.yaml"
+      default: ".ods/*,.ods/repos/*/.ods/*,.ods/artifacts/*/*.json,.ods/artifacts/*/*.yaml"
+    - name: set
+      description: >-
+        Set template data values directly.
+        Multiple key=value pairs are separated by colons. Keys specified have
+        precedence over those discovered through `data-sources`.
+      type: string
+      default: ""
     - name: pdf-theme
       description: >-
         The name or file path of the Asciidoctor PDF theme to load.
@@ -56,7 +63,8 @@ spec:
         render-template \
           --template='$(params.template)' \
           --output-dir=$(params.output-dir) \
-          --data-source='$(params.data-sources)'
+          --data-source='$(params.data-sources)' \
+          --set='$(params.set)'
 
         asciidoctor_pdf_flags='--failure-level ERROR'
         if [ "$(params.pdf-theme)" != "" ]; then

cmd/render/main.go

@@ -20,12 +20,14 @@ func main() {
 	outputDir := flag.String("output-dir", "", "Output directory where to place the rendered files")
 	var dataSourceFlags multiFlag
 	flag.Var(&dataSourceFlags, "data-source", "Glob pattern from where to source data (may be specified multiple times)")
+	var setFlags multiFlag
+	flag.Var(&setFlags, "set", "Set values on the command line (can specify multiple or separate values with commas: key1=val1,key2=val2)")
 	flag.Parse()
 	wd, err := os.Getwd()
 	if err != nil {
 		log.Fatal(err)
 	}
-	if err := render(wd, *templateGlob, *outputDir, dataSourceFlags); err != nil {
+	if err := render(wd, *templateGlob, *outputDir, dataSourceFlags, setFlags); err != nil {
 		log.Fatal(err)
 	}
 }

cmd/render/multiflag.go

@@ -12,6 +12,6 @@ func (i *multiFlag) String() string {
 }
 
 func (i *multiFlag) Set(value string) error {
-	*i = append(*i, strings.Split(value, ";")...)
+	*i = append(*i, strings.Split(value, ",")...)
 	return nil
 }

cmd/render/render.go

@@ -14,7 +14,7 @@ import (
 
 var nonAlphanumericRegex = regexp.MustCompile(`[^a-zA-Z0-9]+`)
 
-func render(baseDir, templateGlob, outputDir string, dataSourceGlobs []string) error {
+func render(baseDir, templateGlob, outputDir string, dataSourceGlobs, setFlags []string) error {
 	if !strings.HasSuffix(baseDir, "/") {
 		baseDir = baseDir + "/"
 	}
@@ -30,6 +30,14 @@ func render(baseDir, templateGlob, outputDir string, dataSourceGlobs []string) e
 	if err != nil {
 		return err
 	}
+	// Add key=value paris specified via --set.
+	for _, v := range setFlags {
+		key, value, found := strings.Cut(v, "=")
+		if !found {
+			return fmt.Errorf("%q is not a valid --set flag, must be of form key=value", v)
+		}
+		data[key] = value
+	}
 
 	matches, err := filepath.Glob(filepath.Join(baseDir, templateGlob))
 	if err != nil {

cmd/render/render_test.go

@@ -67,6 +67,10 @@ func TestRender(t *testing.T) {
 			".ods/artifacts/*/*.txt",
 			"*.yaml",
 		},
+		[]string{
+			"keyfoo=valbar",
+			"keybar=valbaz",
+		},
 	); err != nil {
 		t.Fatal(err)
 	}
@@ -89,6 +93,7 @@ func TestRenderFailsOnMissingKeys(t *testing.T) {
 			".ods/artifacts/*/*.txt",
 			"*.yaml",
 		},
+		[]string{},
 	)
 	if err == nil {
 		t.Error("Fixture template error.adoc.tmpl includes non-existent reference")

cmd/render/template_funcs.go

@@ -52,7 +52,7 @@ func toSentence(items []string) string {
 
 // keys returns a slice of all keys in map m.
 func keys(m map[string]any) (keys []string) {
-	for k, _ := range m {
+	for k := range m {
 		keys = append(keys, k)
 	}
 	return

docs/render.adoc

@@ -4,7 +4,7 @@
 
 The purpose of this task is to render a asciidoc template located in the repository into a PDF. In addition to just transforming the asciidoc file to PDF, the task is also able to render information gathered from YAML/JSON files (such as ODS Pipeline artifacts) into the asciidoc file before transforming it to PDF.
 
-The task expects a glob pattern pointing to one or more Go template files (given by parameter `template`). It renders each found Go template with data gathered from files matching the `data-sources` parameter, which defaults to `.ods/\*;.ods/repos/*/.ods/\*;.ods/artifacts/*/\*.json;.ods/artifacts/*/*.yaml`. The asciidoc template can then access data parsed from these files. For example, if file `.ods/artifacts/org.foo/some.json` contains:
+The task expects a glob pattern pointing to one or more Go template files (given by parameter `template`). It renders each found Go template with data gathered from files matching the `data-sources` parameter, which defaults to `.ods/\*,.ods/repos/*/.ods/\*,.ods/artifacts/*/\*.json,.ods/artifacts/*/*.yaml`. The asciidoc template can then access data parsed from these files. For example, if file `.ods/artifacts/org.foo/some.json` contains:
 
 ```
 {"a":"b"}
@@ -48,8 +48,13 @@ without leading `./` and trailing `/`.
 
 
 | data-sources
-| .ods/*;.ods/repos/*/.ods/*;.ods/artifacts/*/*.json;.ods/artifacts/*/*.yaml
-| Glob patterns from where to source data. Multiple glob patterns are separated by semicolons.
+| .ods/*,.ods/repos/*/.ods/*,.ods/artifacts/*/*.json,.ods/artifacts/*/*.yaml
+| Glob patterns from where to source data. Multiple glob patterns are separated by colons.
+
+
+| set
+| 
+| Set template data values directly. Multiple key=value pairs are separated by colons. Keys specified have precedence over those discovered through `data-sources`.
 
 
 | pdf-theme

tasks/render.yaml

@@ -28,9 +28,16 @@ spec:
     - name: data-sources
       description: >-
         Glob patterns from where to source data.
-        Multiple glob patterns are separated by semicolons.
+        Multiple glob patterns are separated by colons.
       type: string
-      default: ".ods/*;.ods/repos/*/.ods/*;.ods/artifacts/*/*.json;.ods/artifacts/*/*.yaml"
+      default: ".ods/*,.ods/repos/*/.ods/*,.ods/artifacts/*/*.json,.ods/artifacts/*/*.yaml"
+    - name: set
+      description: >-
+        Set template data values directly.
+        Multiple key=value pairs are separated by colons. Keys specified have
+        precedence over those discovered through `data-sources`.
+      type: string
+      default: ""
     - name: pdf-theme
       description: >-
         The name or file path of the Asciidoctor PDF theme to load.
@@ -58,7 +65,8 @@ spec:
         render-template \
           --template='$(params.template)' \
           --output-dir=$(params.output-dir) \
-          --data-source='$(params.data-sources)'
+          --data-source='$(params.data-sources)' \
+          --set='$(params.set)'
 
         asciidoctor_pdf_flags='--failure-level ERROR'
         if [ "$(params.pdf-theme)" != "" ]; then

test/e2e/render_test.go

@@ -17,6 +17,7 @@ func TestRenderAdocTask(t *testing.T) {
 		ttr.UsingTask("ods-pipeline-adoc-render"),
 		ttr.WithStringParams(map[string]string{
 			"template":                   "templates/*.adoc.tmpl",
+			"set":                        "greeting=Hello,who=World",
 			"output-dir":                 "rendered",
 			"retain-rendered-adoc-files": "true",
 		}),

test/testdata/fixtures/sample.adoc.tmpl

@@ -23,4 +23,7 @@ Sprig template functions can be used:
 {{toDate "2006-01-02" "2017-12-31" | date "02/01/2006"}}
 
 And custom helper functions can be used:
-{{toYAML .ods.artifacts.org_opendevstack_pipeline_go_foo.result -}}
+{{toYAML .ods.artifacts.org_opendevstack_pipeline_go_foo.result}}
+
+It is also possible to use values set from the CLI:
+{{.keyfoo}} and {{.keybar}}

test/testdata/golden/sample.adoc

@@ -25,3 +25,7 @@ Sprig template functions can be used:
 And custom helper functions can be used:
 bar: b
 foo: a
+
+
+It is also possible to use values set from the CLI:
+valbar and valbaz

test/testdata/workspaces/sample-app/templates/one.adoc.tmpl

@@ -1,4 +1,4 @@
-# Hello World
+# {{.greeting}} {{.who}}
 
 This is a sample adoc file.
 

test/testdata/workspaces/sample-app/templates/two.adoc.tmpl

@@ -1,4 +1,4 @@
-# Hello World - 2nd file
+# {{.greeting}} {{.who}} - 2nd file
 
 This is a second adoc file.