Move `IsReadmeFile*` from `modules/markup/` to `modules/util` (#22877)

These functions don't examine contents, just filenames, so they don't
fit in well in a markup module.

This was originally part of
https://github.com/go-gitea/gitea/pull/22177.

Signed-off-by: Nick Guenther <nick.guenther@polymtl.ca>

2 files changed, 0 insertions, 129 deletions

diff --git a/modules/markup/renderer.go b/modules/markup/renderer.go
index 5a31e961fb..df2c9ebfc6 100644
--- a/modules/markup/renderer.go
+++ b/modules/markup/renderer.go
@@ -317,41 +317,3 @@ func IsMarkupFile(name, markup string) bool {
 	}
 	return false
 }
-
-// IsReadmeFile reports whether name looks like a README file
-// based on its name.
-func IsReadmeFile(name string) bool {
-	name = strings.ToLower(name)
-	if len(name) < 6 {
-		return false
-	} else if len(name) == 6 {
-		return name == "readme"
-	}
-	return name[:7] == "readme."
-}
-
-// IsReadmeFileExtension reports whether name looks like a README file
-// based on its name. It will look through the provided extensions and check if the file matches
-// one of the extensions and provide the index in the extension list.
-// If the filename is `readme.` with an unmatched extension it will match with the index equaling
-// the length of the provided extension list.
-// Note that the '.' should be provided in ext, e.g ".md"
-func IsReadmeFileExtension(name string, ext ...string) (int, bool) {
-	name = strings.ToLower(name)
-	if len(name) < 6 || name[:6] != "readme" {
-		return 0, false
-	}
-
-	for i, extension := range ext {
-		extension = strings.ToLower(extension)
-		if name[6:] == extension {
-			return i, true
-		}
-	}
-
-	if name[6] == '.' {
-		return len(ext), true
-	}
-
-	return 0, false
-}
diff --git a/modules/markup/renderer_test.go b/modules/markup/renderer_test.go
index 624558c3f7..0791081f94 100644
--- a/modules/markup/renderer_test.go
+++ b/modules/markup/renderer_test.go
@@ -2,94 +2,3 @@
 // SPDX-License-Identifier: MIT
 
 package markup_test
-
-import (
-	"testing"
-
-	. "code.gitea.io/gitea/modules/markup"
-
-	_ "code.gitea.io/gitea/modules/markup/markdown"
-
-	"github.com/stretchr/testify/assert"
-)
-
-func TestMisc_IsReadmeFile(t *testing.T) {
-	trueTestCases := []string{
-		"readme",
-		"README",
-		"readME.mdown",
-		"README.md",
-		"readme.i18n.md",
-	}
-	falseTestCases := []string{
-		"test.md",
-		"wow.MARKDOWN",
-		"LOL.mDoWn",
-		"test",
-		"abcdefg",
-		"abcdefghijklmnopqrstuvwxyz",
-		"test.md.test",
-		"readmf",
-	}
-
-	for _, testCase := range trueTestCases {
-		assert.True(t, IsReadmeFile(testCase))
-	}
-	for _, testCase := range falseTestCases {
-		assert.False(t, IsReadmeFile(testCase))
-	}
-
-	type extensionTestcase struct {
-		name     string
-		expected bool
-		idx      int
-	}
-
-	exts := []string{".md", ".txt", ""}
-	testCasesExtensions := []extensionTestcase{
-		{
-			name:     "readme",
-			expected: true,
-			idx:      2,
-		},
-		{
-			name:     "readme.md",
-			expected: true,
-			idx:      0,
-		},
-		{
-			name:     "README.md",
-			expected: true,
-			idx:      0,
-		},
-		{
-			name:     "ReAdMe.Md",
-			expected: true,
-			idx:      0,
-		},
-		{
-			name:     "readme.txt",
-			expected: true,
-			idx:      1,
-		},
-		{
-			name:     "readme.doc",
-			expected: true,
-			idx:      3,
-		},
-		{
-			name: "readmee.md",
-		},
-		{
-			name:     "readme..",
-			expected: true,
-			idx:      3,
-		},
-	}
-
-	for _, testCase := range testCasesExtensions {
-		idx, ok := IsReadmeFileExtension(testCase.name, exts...)
-		assert.Equal(t, testCase.expected, ok)
-		assert.Equal(t, testCase.idx, idx)
-	}
-}