(#37) remove figure captions when caption is empty

CHANGELOG.md

@@ -2,6 +2,10 @@
 
 pandoc-plot uses [Semantic Versioning](http://semver.org/spec/v2.0.0.html)
 
+## Release 1.5.1
+
+* Figures with no captions (and no link to the source script), will now be shown as an image, without figure numbering (#37).
+
 ## Release 1.5.0
 
 * Added support for [Sage](https://www.sagemath.org/) (#44).

pandoc-plot.cabal

@@ -1,6 +1,6 @@
 cabal-version:  2.2
 name:           pandoc-plot
-version:        1.5.0
+version:        1.5.1
 synopsis:       A Pandoc filter to include figures generated from code blocks using your plotting toolkit of choice.
 description:    A Pandoc filter to include figures generated from code blocks. 
                 Keep the document and code in the same location. Output is 

src/Text/Pandoc/Filter/Plot/Embed.hs

@@ -79,12 +79,15 @@ figure ::
   FilePath ->
   Inlines ->
   PlotM Block
--- To render images as figures with captions, the target title
--- must be "fig:"
--- Janky? yes
 figure as fp caption' =
   return . head . toList . para $
-    imageWith as (pack fp) "fig:" caption'
+    imageWith as (pack fp) title caption'
+  where
+    -- To render images as figures with captions, the target title
+    -- must be "fig:"
+    -- Janky? yes
+    -- In case there is no caption, make this an image instead of a figure
+    title = if caption' /= mempty then "fig:" else mempty
 
 -- TODO: also add the case where SVG plots can be
 --       embedded in HTML output

tests/Common.hs

@@ -317,6 +317,30 @@ testMarkdownFormattingCaption2 tk =
     extractImageCaption (Image _ c _) = c
     extractImageCaption _ = mempty
 
+-------------------------------------------------------------------------------
+-- Test that Markdown bold formatting in captions is correctly rendered
+testFigureWithoutCaption :: Toolkit -> TestTree
+testFigureWithoutCaption tk =
+  testCase "appropriately build an image if no caption" $ do
+    let postfix = unpack . cls $ tk
+    tempDir <- (</> "test-image-if-no-caption-" <> postfix) <$> getTemporaryDirectory
+    ensureDirectoryExistsAndEmpty tempDir
+
+    -- Note that this test is fragile, in the sense that the expected result must be carefully
+    -- constructed
+    let cb =
+          addDirectory tempDir $ codeBlock tk (trivialContent tk)
+        fmt = B.Format "markdown"
+    result <- runPlotM Nothing (defaultTestConfig {captionFormat = fmt}) $ make cb
+    assertEqual "" (Just mempty) (extractTitle result)
+  where
+    extractTitle (B.Para blocks) = extractImageCaption . head $ blocks
+    extractTitle _ = Nothing
+
+    extractImageCaption (Image _ _ (_, title)) = Just title
+    extractImageCaption _ = Nothing
+
+
 -------------------------------------------------------------------------------
 -- Test that cleanOutpuDirs correctly cleans the output directory specified in a block.
 testCleanOutputDirs :: Toolkit -> TestTree

tests/Main.hs

@@ -58,6 +58,7 @@ toolkitSuite tk =
       testOverrideConfiguration,
       testMarkdownFormattingCaption1,
       testMarkdownFormattingCaption2,
+      testFigureWithoutCaption,
       testCleanOutputDirs,
       testChecksFail
     ]