init

back/internal/tools/utils.go

@@ -0,0 +1,61 @@
+package tools
+
+import "strings"
+
+// RemoveFirstLines removes the first n lines. Returns "" if n >= total lines.
+func RemoveFirstLines(input string, n int) string {
+	lines := strings.Split(input, "\n")
+	if n >= len(lines) {
+		return ""
+	}
+	return strings.Join(lines[n:], "\n")
+}
+
+// RemoveLastLines removes the last n lines. Returns "" if n >= total lines.
+func RemoveLastLines(input string, n int) string {
+	lines := strings.Split(input, "\n")
+	if n >= len(lines) {
+		return ""
+	}
+	return strings.Join(lines[:len(lines)-n], "\n")
+}
+
+// CropBefore removes everything before the first occurrence of y (inclusive of y).
+// Returns input unchanged if y is not found.
+func CropBefore(input string, y string) string {
+	idx := strings.Index(input, y)
+	if idx == -1 {
+		return input
+	}
+	return input[idx:]
+}
+
+// CropAfter removes everything after the last occurrence of y (inclusive of y).
+// Returns input unchanged if y is not found.
+func CropAfter(input string, y string) string {
+	idx := strings.LastIndex(input, y)
+	if idx == -1 {
+		return input
+	}
+	return input[:idx+len(y)]
+}
+
+// CropBeforeExclude removes everything before and including the first occurrence of y.
+// Returns input unchanged if y is not found.
+func CropBeforeExclude(input string, y string) string {
+	idx := strings.Index(input, y)
+	if idx == -1 {
+		return input
+	}
+	return input[idx+len(y):]
+}
+
+// CropAfterExclude removes everything from the last occurrence of y onwards.
+// Returns input unchanged if y is not found.
+func CropAfterExclude(input string, y string) string {
+	idx := strings.LastIndex(input, y)
+	if idx == -1 {
+		return input
+	}
+	return input[:idx]
+}