Fix working with abbreviations.

checks.go

@@ -18,6 +18,9 @@ var (
 	// A sentence can be inside parenthesis, and therefore ends with parenthesis.
 	lastChars = []string{".", "?", "!", ".)", "?)", "!)", specialReplacer}
 
+	// Abbreviations to exclude from capital letters check.
+	abbreviations = []string{"i.e.", "i. e.", "e.g.", "e. g."}
+
 	// Special tags in comments like "// nolint:", or "// +k8s:".
 	tags = regexp.MustCompile(`^\+?[a-z0-9]+:`)
 
@@ -164,6 +167,12 @@ func checkPeriod(comment string) (pos position, ok bool) {
 // NOTE: First letter is not checked in declaration comments, because they
 // can describe unexported functions, which start from small letter.
 func checkCapital(comment string, skipFirst bool) (pp []position) {
+	// Remove common abbreviations from the comment
+	for _, abbr := range abbreviations {
+		repl := strings.ReplaceAll(abbr, ".", "_")
+		comment = strings.ReplaceAll(comment, abbr, repl)
+	}
+
 	// List of states during the scan: `empty` - nothing special,
 	// `endChar` - found one of sentence ending chars (.!?),
 	// `endOfSentence` - found `endChar`, and then space or newline.

checks_test.go

@@ -180,6 +180,12 @@ func TestCheckCapital(t *testing.T) {
 				{line: 1, column: 5},
 			},
 		},
+		{
+			name:      "sentence with abbreviations",
+			text:      "One two, i.e. hello, world, e.g. e. g. word",
+			skipFirst: false,
+			issues:    nil,
+		},
 	}
 
 	for _, tt := range testCases {

testdata/check/main.go

@@ -130,8 +130,11 @@ func inside() {
 
 // nonCapital is a function. non-capital-decl first letter [CAPITAL_DECL].
 func nonCapital() int {
+	// Test abbreviation (e.g. like this) [PASS].
+	x := 10
+
 	// non-capital-all [CAPITAL_ALL].
-	return 10 // non-capital-all [CAPITAL_ALL].
+	return x // non-capital-all [CAPITAL_ALL].
 }
 
 // Comment with a URL - http://example.com/[PASS]