From e3348fc42bc38d28ef281a8fe9bd66e57e56ce4c Mon Sep 17 00:00:00 2001
From: Austin Schneider <hogenshpogen@gmail.com>
Date: Fri, 13 Sep 2024 19:31:03 -0600
Subject: [PATCH] Utilities for string manipulation (mainly inserting tabs)

---
 projects/utilities/CMakeLists.txt             |  1 +
 .../utilities/private/StringManipulation.cxx  | 41 +++++++++++++++++++
 .../SIREN/utilities/StringManipulation.h      | 17 ++++++++
 3 files changed, 59 insertions(+)
 create mode 100644 projects/utilities/private/StringManipulation.cxx
 create mode 100644 projects/utilities/public/SIREN/utilities/StringManipulation.h

diff --git a/projects/utilities/CMakeLists.txt b/projects/utilities/CMakeLists.txt
index f0dec7b9..5ad24dfa 100644
--- a/projects/utilities/CMakeLists.txt
+++ b/projects/utilities/CMakeLists.txt
@@ -3,6 +3,7 @@
 LIST (APPEND utilities_SOURCES
     ${PROJECT_SOURCE_DIR}/projects/utilities/private/Interpolator.cxx
     ${PROJECT_SOURCE_DIR}/projects/utilities/private/Random.cxx
+    ${PROJECT_SOURCE_DIR}/projects/utilities/private/StringManipulation.cxx
 )
 add_library(SIREN_utilities OBJECT ${utilities_SOURCES})
 set_property(TARGET SIREN_utilities PROPERTY POSITION_INDEPENDENT_CODE ON)
diff --git a/projects/utilities/private/StringManipulation.cxx b/projects/utilities/private/StringManipulation.cxx
new file mode 100644
index 00000000..96f009f6
--- /dev/null
+++ b/projects/utilities/private/StringManipulation.cxx
@@ -0,0 +1,41 @@
+#include <string>
+#include <vector>
+#include <sstream>
+
+#include "SIREN/utilities/StringManipulation.h"
+
+namespace siren {
+namespace utilities {
+
+std::string add_prefix(std::string const & input, std::string const & prefix) {
+    std::istringstream iss(input);
+    std::vector<std::string> lines;
+    std::string line;
+    ssize_t last_non_empty_line = -1;
+    size_t line_number = 0;
+
+    // Read each line and track the last non-empty line
+    while (std::getline(iss, line)) {
+        lines.push_back(line);
+        if (!line.empty()) {
+            last_non_empty_line = line_number;
+        }
+        line_number++;
+    }
+
+    std::ostringstream oss;
+
+    // Add prefix to each line up to the last non-empty line
+    if (last_non_empty_line >= 0) {
+        for (size_t i = 0; i <= static_cast<size_t>(last_non_empty_line); ++i) {
+            oss << prefix << lines[i] << '\n';
+        }
+        // Ensure the string ends with an empty newline
+        oss << '\n';
+    }
+
+    return oss.str();
+}
+
+} // namespace utilities
+} // namespace siren
diff --git a/projects/utilities/public/SIREN/utilities/StringManipulation.h b/projects/utilities/public/SIREN/utilities/StringManipulation.h
new file mode 100644
index 00000000..ef3d90a7
--- /dev/null
+++ b/projects/utilities/public/SIREN/utilities/StringManipulation.h
@@ -0,0 +1,17 @@
+#pragma once
+#ifndef SIREN_StringMapulation_H
+#define SIREN_StringMapulation_H
+
+#include <string>
+
+namespace siren {
+namespace utilities {
+
+constexpr char const * tab = "  ";
+
+std::string add_prefix(std::string const & input, std::string const & prefix);
+
+} // namespace utilities
+} // namespace siren
+
+#endif // SIREN_StringMapulation_H