Add nocaseMagicOnly flag

Glob is faster when comparing strings, and path-scurry handles
case-insensitive file systems anyway.

README.md

@@ -187,6 +187,16 @@ Disable "extglob" style patterns like `+(a|b)`.
 
 Perform a case-insensitive match.
 
+### nocaseMagicOnly
+
+When used with `{nocase: true}`, create regular expressions that
+are case-insensitive, but leave string match portions untouched.
+Has no effect when used without `{nocase: true}`
+
+Useful when some other form of case-insensitive matching is used,
+or if the original string representation is useful in some other
+way.
+
 ### nonull
 
 When a match is not found by `minimatch.match`, return a list containing

src/index.ts

@@ -11,6 +11,7 @@ export interface MinimatchOptions {
   partial?: boolean
   dot?: boolean
   nocase?: boolean
+  nocaseMagicOnly?: boolean
   matchBase?: boolean
   flipNegate?: boolean
   preserveMultipleSlashes?: boolean
@@ -1087,7 +1088,7 @@ export class Minimatch {
     }
 
     // if it's nocase, and the lcase/uppercase don't match, it's magic
-    if (options.nocase && !hasMagic) {
+    if (options.nocase && !hasMagic && !options.nocaseMagicOnly) {
       hasMagic = pattern.toUpperCase() !== pattern.toLowerCase()
     }
 

test/basic.js

@@ -222,8 +222,25 @@ t.test('globstar re matches zero or more path portions', t => {
   t.end()
 })
 
-t.test('do not create empty pattern via ..', t =>{
+t.test('do not create empty pattern via ..', t => {
   const m = new mm.Minimatch('*/..')
   t.same(m.globParts, [['']])
   t.end()
 })
+
+t.test('option to only nocase regexps, not strings', t => {
+  t.match(
+    new mm.Minimatch('test/*.js', {
+      nocase: true,
+      nocaseMagicOnly: true,
+    }).set,
+    [['test', /^(?!\.)(?=.)[^/]*?\.js$/i]]
+  )
+  t.match(
+    new mm.Minimatch('test/*.js', {
+      nocase: true,
+    }).set,
+    [[/^test$/i, /^(?!\.)(?=.)[^/]*?\.js$/i]]
+  )
+  t.end()
+})