From 0636cbf55a48e06b40a91bbcae460ef71122c48f Mon Sep 17 00:00:00 2001
From: Juan Carlos <JuanCarlospaco@gmail.com>
Date: Wed, 10 Jun 2020 16:46:39 -0300
Subject: [PATCH] Add rstgen.rstToLatex convenience proc for renderRstToOut and
 initRstGenerator with outLatex output, see
 https://github.com/nim-lang/fusion/pull/11#issuecomment-641804899

---
 changelog.md                     |  2 ++
 lib/packages/docutils/rstgen.nim | 11 +++++++++++
 2 files changed, 13 insertions(+)

diff --git a/changelog.md b/changelog.md
index e86e42b339c61..623b3f6bcf29e 100644
--- a/changelog.md
+++ b/changelog.md
@@ -111,6 +111,8 @@
 - new module `std/jsonutils` with hookable `jsonTo,toJson,fromJson` for json serialization/deserialization of custom types.
 
 - new proc `heapqueue.find[T](heap: HeapQueue[T], x: T): int` to get index of element ``x``.
+- Add `rstgen.rstToLatex` convenience proc for `renderRstToOut` and `initRstGenerator` with `outLatex` output.
+
 
 ## Language changes
 - In the newruntime it is now allowed to assign discriminator field without restrictions as long as case object doesn't have custom destructor. Discriminator value doesn't have to be a constant either. If you have custom destructor for case object and you do want to freely assign discriminator fields, it is recommended to refactor object into 2 objects like this:
diff --git a/lib/packages/docutils/rstgen.nim b/lib/packages/docutils/rstgen.nim
index 6a7b33cc05ea8..2ec25cc6e4e19 100644
--- a/lib/packages/docutils/rstgen.nim
+++ b/lib/packages/docutils/rstgen.nim
@@ -29,6 +29,7 @@ import strutils, os, hashes, strtabs, rstast, rst, highlite, tables, sequtils,
   algorithm, parseutils
 import "$lib/../compiler/nimpaths"
 import "$lib/../compiler/pathutils"
+import ../../std/private/since
 
 const
   HtmlExt = "html"
@@ -1344,6 +1345,16 @@ proc rstToHtml*(s: string, options: RstParseOptions,
   renderRstToOut(d, rst, result)
 
 
+proc rstToLatex*(rstSource: string; options: RstParseOptions): string {.inline, since: (1, 3).} =
+  ## Convenience proc for `renderRstToOut` and `initRstGenerator`.
+  runnableExamples: doAssert rstToLatex("*Hello* **world**", {}) == """\emph{Hello} \textbf{world}"""
+  if rstSource.len == 0: return
+  var option: bool
+  var rstGenera: RstGenerator
+  rstGenera.initRstGenerator(outLatex, defaultConfig(), "input", options)
+  rstGenera.renderRstToOut(rstParse(rstSource, "", 1, 1, option, options), result)
+
+
 when isMainModule:
   assert rstToHtml("*Hello* **world**!", {},
     newStringTable(modeStyleInsensitive)) ==