From bb246781579b3a0abbbd8578d84acf60fe3475b4 Mon Sep 17 00:00:00 2001
From: Reed Esau <reed@esau.org>
Date: Wed, 20 Aug 2014 23:01:29 -0600
Subject: [PATCH] Support very subtle background for code blocks and inline

Inspired by how code appears in the markdown at github.
---
 README.markdown   |  8 ++++++++
 colors/pencil.vim | 31 +++++++++++++++++++++++++------
 2 files changed, 33 insertions(+), 6 deletions(-)

diff --git a/README.markdown b/README.markdown
index 32c5497..d747e9b 100644
--- a/README.markdown
+++ b/README.markdown
@@ -62,6 +62,14 @@ If you’re looking for neutral heading colors, set the following in your
 let g:pencil_neutral_headings = 1   " 0=blue (def), 1=normal
 ```
 
+### Markdown Code background
+
+If you’re looking for contrast in the code background in markdown:
+
+```
+let g:pencil_markdown_code_bg = 0   " 0=none (def), 1=subtle
+```
+
 ### Airline Theme
 
 ![airline-example](http://i.imgur.com/V39pwZq.png)
diff --git a/colors/pencil.vim b/colors/pencil.vim
index 03b482b..7667cda 100644
--- a/colors/pencil.vim
+++ b/colors/pencil.vim
@@ -45,6 +45,10 @@ if ! exists("g:pencil_neutral_headings")
   let g:pencil_neutral_headings = 0
 endif
 
+if ! exists("g:pencil_markdown_code_bg")
+  let g:pencil_markdown_code_bg = 0
+endif
+
 " Colors
 let s:black           = { "gui": "#212121", "cterm": "0"   }
 let s:medium_gray     = { "gui": "#767676", "cterm": "243" }
@@ -261,7 +265,6 @@ call s:h("htmlLink",      {"fg": s:blue, "gui": "underline", "cterm": "underline
 
 " tpope/vim-markdown
 call s:h("markdownBlockquote",          {"fg": s:norm})
-call s:h("markdownCodeDelimiter",       {"fg": s:norm})
 call s:h("markdownH1",                  {"fg": s:head_a, "gui": "bold,italic"})
 call s:h("markdownH2",                  {"fg": s:head_a, "gui": "bold"})
 call s:h("markdownH3",                  {"fg": s:head_a, "gui": "italic"})
@@ -282,13 +285,18 @@ call s:h("markdownUrl",                 {"fg": s:medium_gray, "gui": "underline"
 call s:h("markdownUrlDelimiter",        {"fg": s:medium_gray})
 call s:h("markdownUrlTitle",            {"fg": s:norm})
 call s:h("markdownUrlTitleDelimiter",   {"fg": s:medium_gray})
+if g:pencil_markdown_code_bg == 1
+  call s:h("markdownCode",                {"fg": s:norm, "bg": s:bg_very_subtle})
+  call s:h("markdownCodeDelimiter",       {"fg": s:norm, "bg": s:bg_very_subtle})
+else
+  call s:h("markdownCode",                {"fg": s:norm})
+  call s:h("markdownCodeDelimiter",       {"fg": s:norm})
+en
 
 " plasticboy/vim-markdown
 call s:h("mkdBlockQuote",               {"fg": s:norm})
-call s:h("mkdCode",                     {"fg": s:norm})
 call s:h("mkdDelimiter",                {"fg": s:medium_gray})
 call s:h("mkdID",                       {"fg": s:medium_gray})
-call s:h("mkdIndentCode",               {"fg": s:norm})
 call s:h("mkdLineContinue",             {"fg": s:norm})
 call s:h("mkdLink",                     {"fg": s:norm})
 call s:h("mkdLinkDef",                  {"fg": s:medium_gray})
@@ -296,12 +304,16 @@ call s:h("mkdListItem",                 {"fg": s:norm})
 call s:h("mkdNonListItemBlock",         {"fg": s:norm})  " bug in syntax?
 call s:h("mkdRule",                     {"fg": s:norm})
 call s:h("mkdUrl",                      {"fg": s:medium_gray, "gui": "underline", "cterm": "underline"})
+if g:pencil_markdown_code_bg == 1
+  call s:h("mkdCode",                     {"fg": s:norm, "bg": s:bg_very_subtle})
+  call s:h("mkdIndentCode",               {"fg": s:norm, "bg": s:bg_very_subtle})
+else
+  call s:h("mkdCode",                     {"fg": s:norm})
+  call s:h("mkdIndentCode",               {"fg": s:norm})
+en
 
 " gabrielelana/vim-markdown
-call s:h("markdownBlockquote",          {"fg": s:norm})
 call s:h("markdownBlockquoteDelimiter", {"fg": s:norm})
-call s:h("markdownFencedCodeBlock",     {"fg": s:norm})
-call s:h("markdownInlineCode",          {"fg": s:norm})
 call s:h("markdownInlineDelimiter",     {"fg": s:norm})
 call s:h("markdownItemDelimiter",       {"fg": s:norm})
 call s:h("markdownLinkReference",       {"fg": s:medium_gray})
@@ -309,6 +321,13 @@ call s:h("markdownLinkText",            {"fg": s:norm})
 call s:h("markdownLinkTextContainer",   {"fg": s:medium_gray})
 call s:h("markdownLinkUrl",             {"fg": s:medium_gray, "gui": "underline", "cterm": "underline"})
 call s:h("markdownLinkUrlContainer",    {"fg": s:medium_gray})
+if g:pencil_markdown_code_bg == 1
+  call s:h("markdownFencedCodeBlock",     {"fg": s:norm, "bg": s:bg_very_subtle})
+  call s:h("markdownInlineCode",          {"fg": s:norm, "bg": s:bg_very_subtle})
+else
+  call s:h("markdownFencedCodeBlock",     {"fg": s:norm})
+  call s:h("markdownInlineCode",          {"fg": s:norm})
+en
 
 " XML content
 hi! link xmlTag                     htmlTag