implement container blocks

src/nimib.nim

@@ -52,6 +52,9 @@ template nbInit*(theme = themes.useDefault, backend = renders.useHtmlBackend, th
   nb.partials = initTable[string, string]()
   nb.context = newContext(searchDirs = @[]) # templateDirs and partials added during nbSave
 
+  nb.currentStdout = stdout.getFileHandle()
+  nb.originalStdout = dup(nb.currentStdout)
+
   # apply render backend (default backend can be overriden by theme)
   backend nb
 
@@ -68,6 +71,17 @@ template newNbSlimBlock*(cmd: string, blockImpl: untyped) =
   # a slim block is a block with no body
   newNbBlock(cmd, false, nb, nb.blk, "", blockImpl)
 
+template nbUseCurrentBlockAsContainer*(body: untyped) =
+  let currentBlk = nb.blk
+  let currentBlocks = nb.blocks
+  nb.blocks = @[]
+
+  body
+
+  nb.blk = currentBlk
+  nb.blk.blocks = nb.blocks
+  nb.blocks = currentBlocks
+
 # block templates
 template nbCode*(body: untyped) =
   newNbCodeBlock("nbCode", body):

src/nimib/blocks.nim

@@ -1,5 +1,5 @@
 import std / [macros, strutils, sugar]
-import types, sources
+import types, sources, capture
 
 macro toStr*(body: untyped): string =
   (body.toStrLit)
@@ -17,17 +17,20 @@ func nbNormalize*(text: string): string =
 # note that: '\c' == '\r' and '\l' == '\n'
 
 template newNbBlock*(cmd: string, readCode: static[bool], nbDoc, nbBlock, body, blockImpl: untyped) =
-  stdout.write "[nimib] ", nbDoc.blocks.len, " ", cmd, ": "
+  disableCaptureStdout:
+    stdout.write "[nimib] ", nbDoc.blocks.len, " ", cmd, ": "
   nbBlock = NbBlock(command: cmd, context: newContext(searchDirs = @[], partials = nbDoc.partials))
   when readCode:
     nbBlock.code = nbNormalize:
       when defined(nimibCodeFromAst):
         toStr(body)
       else:
         getCodeAsInSource(nbDoc.source, cmd, body)
-  echo peekFirstLineOf(nbBlock.code)
+  disableCaptureStdout:
+    echo peekFirstLineOf(nbBlock.code)
   blockImpl
-  if len(nbBlock.output) > 0: echo "     -> ", peekFirstLineOf(nbBlock.output)
+  disableCaptureStdout:
+    if len(nbBlock.output) > 0: echo "     -> ", peekFirstLineOf(nbBlock.output)
   nbBlock.context["code"] = nbBlock.code
   nbBlock.context["output"] = nbBlock.output.dup(removeSuffix)
   nbDoc.blocks.add nbBlock

src/nimib/capture.nim

@@ -5,9 +5,19 @@ import tempfile
 # Thanks, Clonk!
 
 # low level, should be Posix only but they happen to work on (my) Windows, too!
-proc dup(oldfd: FileHandle): FileHandle {.importc, header: "unistd.h".}
+proc dup*(oldfd: FileHandle): FileHandle {.importc, header: "unistd.h".}
 proc dup2(oldfd: FileHandle, newfd: FileHandle): cint {.importc, header: "unistd.h".}
 
+template disableCaptureStdout*(body: untyped) =
+  # want to write to stdout but not to our custom file.
+  let currentStdout = dup(nb.currentStdout)
+  discard dup2(nb.originalStdout, nb.currentStdout)
+  flushFile stdout
+  body
+  flushFile stdout
+
+  discard dup2(currentStdout, nb.currentStdout)
+
 template captureStdout*(ident: untyped, body: untyped) =
   ## redirect stdout to a temporary file and captures output of body in ident
   let

src/nimib/renders.nim

@@ -4,12 +4,20 @@ export escapeTag # where is this used? why do I export? a better solution is to
 import highlight
 import mustachepkg/values
 
+proc render*(nb: var NbDoc, blk: var NbBlock): string
+
 proc mdOutputToHtml(doc: var NbDoc, blk: var NbBlock) =
   blk.context["outputToHtml"] = markdown(blk.output, config=initGfmConfig()).dup(removeSuffix)
 
 proc highlightCode(doc: var NbDoc, blk: var NbBlock) =
   blk.context["codeHighlighted"] = highlightNim(blk.code)
 
+proc renderContainer(doc: var NbDoc, blk: var NbBlock) =
+  var children: seq[string]
+  for child in blk.blocks.mitems: 
+    children.add doc.render(child)
+  blk.context["blocks"] = children
+
 
 proc useHtmlBackend*(doc: var NbDoc) =
   doc.partials["nbText"] = "{{&outputToHtml}}"
@@ -52,6 +60,7 @@ proc useHtmlBackend*(doc: var NbDoc) =
   doc.renderProcs["mdOutputToHtml"] = mdOutputToHtml
   doc.renderProcs["highlightCode"] = highlightCode
   doc.renderProcs["compileNimToJs"] = compileNimToJs
+  doc.renderProcs["renderContainer"] = renderContainer
 
 proc useMdBackend*(doc: var NbDoc) =
   doc.partials["document"] = """

src/nimib/types.nim

@@ -8,6 +8,7 @@ type
     code*: string
     output*: string
     context*: Context
+    blocks*: seq[NbBlock]
   NbOptions* = object
     skipCfg*: bool
     cfgName*, srcDir*, homeDir*, filename*: string
@@ -34,7 +35,8 @@ type
     renderPlans*: Table[string, seq[string]]
     renderProcs*: Table[string, NbRenderProc]
     id: int
-    nbJsCounter*: int 
+    nbJsCounter*: int
+    currentStdout*, originalStdout*: FileHandle
 
 proc thisDir*(doc: NbDoc): AbsoluteDir = doc.thisFile.splitFile.dir
 proc srcDir*(doc: NbDoc): AbsoluteDir =