enh(shell) allow period in prompt match (#4244)

Allow a "." to match in the prompt section of shell/console examples.

Author: ianw

CHANGES.md

@@ -13,6 +13,7 @@ Core Grammars:
 - fix(ex) adds support for `?'` char literal and missing `defguardp` keyword [Kevin Bloch][]
 - fix(diff) fix unified diff hunk header regex to allow unpaired numbers [Chris Wilson][]
 - enh(php) support single line and hash comments in attributes, constructor and functions [Antoine Musso][]
+- enh(shell) match period (.) as part of shell prompt [Ian Wienand][]
 
 CONTRIBUTORS
 
@@ -23,6 +24,7 @@ CONTRIBUTORS
 [Chris Wilson]: https://github.com/sushicw
 [Antoine Musso]: https://github.com/hashar
 [Chester Moses]: https://github.com/Chester-Moses-HCL
+[Ian Wienand]: https://github.com/ianw
 
 
 ## Version 11.11.1

src/languages/shell.js

@@ -20,7 +20,7 @@ export default function(hljs) {
         // We cannot add \s (spaces) in the regular expression otherwise it will be too broad and produce unexpected result.
         // For instance, in the following example, it would match "echo /path/to/home >" as a prompt:
         // echo /path/to/home > t.exe
-        begin: /^\s{0,3}[/~\w\d[\]()@-]*[>%$#][ ]?/,
+        begin: /^\s{0,3}[./~\w\d[\]()@-]*[>%$#][ ]?/,
         starts: {
           end: /[^\\](?=\s*$)/,
           subLanguage: 'bash'

test/markup/shell/prompt-with-period.expect.txt

@@ -0,0 +1 @@
+<span class="hljs-meta prompt_">~/git-repo[branch-1.0]$ </span><span class="language-bash"><span class="hljs-built_in">ls</span> a.file</span>

test/markup/shell/prompt-with-period.txt

@@ -0,0 +1 @@
+~/git-repo[branch-1.0]$ ls a.file