Reintroduce newlines via multiple text flags

Goal of this PR is to have some basic labels generated with pangocairo
- size of the canvas should be matching the input text and grow/shrink accordingly
- basic formatting options like fontsize and align should be working

Reviewed-on: moritz/ptouch-prnt#8

src/PrinterDriverFactory.cpp

@@ -1,3 +1,22 @@
+/* 
+    ptrnt - print labels on linux
+    Copyright (C) 2024-2025  Moritz Martinius
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+ */
+
 #include "PrinterDriverFactory.hpp"
 
 #include <algorithm>

src/PrinterDriverFactory.hpp

@@ -1,6 +1,26 @@
+/* 
+    ptrnt - print labels on linux
+    Copyright (C) 2024-2025  Moritz Martinius
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+ */
+
 #include <memory>
-#include <vector>
 #include <string>
+#include <vector>
+
 #include "interface/IPrinterDriver.hpp"
 #include "libusbwrap/LibUsbTypes.hpp"
 
@@ -45,4 +65,4 @@ class PrinterDriverFactory {
    private:
 };
 
-}
+}  // namespace ptprnt

src/PtouchPrint.cpp

@@ -1,6 +1,6 @@
 /* 
     ptrnt - print labels on linux
-    Copyright (C) 2023  Moritz Martinius
+    Copyright (C) 2023-2025  Moritz Martinius
 
     This program is free software: you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by
@@ -37,7 +37,7 @@
 
 #include "CLI/Option.hpp"
 #include "PrinterDriverFactory.hpp"
-#include "graphics/Label.hpp"
+#include "graphics/LabelBuilder.hpp"
 #include "graphics/interface/ILabel.hpp"
 #include "libusbwrap/UsbDeviceFactory.hpp"
 
@@ -162,25 +162,21 @@ int PtouchPrint::run() {
         return 0;
     }
 
-    auto label = std::make_unique<graphics::Label>(printer->getPrinterInfo().pixelLines);
-    std::string labelText{};
-    // TODO: refactor
+    // Use LabelBuilder to construct the label
+    graphics::LabelBuilder labelBuilder(printer->getPrinterInfo().pixelLines);
+
     for (const auto& [cmd, value] : mCommands) {
         switch (cmd) {
             case CliCmdType::Text:
-                if (labelText.empty()) {
-                    labelText = value;
-                } else {
-                    labelText = labelText + '\n' + value;
-                }
+                labelBuilder.addText(value);
                 break;
             case CliCmdType::Font:
                 spdlog::debug("Setting font to {}", value);
-                label->setFontFamily(value);
+                labelBuilder.setFontFamily(value);
                 break;
             case CliCmdType::FontSize:
                 spdlog::debug("Setting font size to {}", std::stod(value));
-                label->setFontSize(std::stod(value));
+                labelBuilder.setFontSize(std::stod(value));
                 break;
             case CliCmdType::HAlign:
                 spdlog::debug("Setting text horizontal alignment to {}", value);
@@ -188,9 +184,9 @@ int PtouchPrint::run() {
                     auto hPos = HALignPositionMap.find(value);
                     if (hPos == HALignPositionMap.end()) {
                         spdlog::warn("Invalid horizontal alignment specified!");
-                        label->setHAlign(HAlignPosition::UNKNOWN);
+                        labelBuilder.setHAlign(HAlignPosition::UNKNOWN);
                     } else {
-                        label->setHAlign(hPos->second);
+                        labelBuilder.setHAlign(hPos->second);
                     }
                 }
                 break;
@@ -199,10 +195,10 @@ int PtouchPrint::run() {
                 {
                     auto vPos = VALignPositionMap.find(value);
                     if (vPos == VALignPositionMap.end()) {
-                        spdlog::warn("Invalid verical alignment specified!");
-                        label->setVAlign(VAlignPosition::UNKNOWN);
+                        spdlog::warn("Invalid vertical alignment specified!");
+                        labelBuilder.setVAlign(VAlignPosition::UNKNOWN);
                     } else {
-                        label->setVAlign(vPos->second);
+                        labelBuilder.setVAlign(vPos->second);
                     }
                 }
                 break;
@@ -213,8 +209,8 @@ int PtouchPrint::run() {
                 break;
         }
     }
-    label->create(labelText);
-    label->writeToPng("./testlabel.png");
+
+    auto label = labelBuilder.build();
     if (!printer->printLabel(std::move(label))) {
         spdlog::error("An error occured while printing");
         return -1;

src/PtouchPrint.hpp

@@ -1,6 +1,6 @@
 /* 
     ptrnt - print labels on linux
-    Copyright (C) 2023  Moritz Martinius
+    Copyright (C) 2023-2025  Moritz Martinius
 
     This program is free software: you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by

src/graphics/Bitmap.cpp

@@ -1,6 +1,6 @@
 /* 
     ptrnt - print labels on linux
-    Copyright (C) 2023  Moritz Martinius
+    Copyright (C) 2023-2025  Moritz Martinius
 
     This program is free software: you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by

src/graphics/Bitmap.hpp

@@ -1,6 +1,6 @@
 /* 
     ptrnt - print labels on linux
-    Copyright (C) 2023  Moritz Martinius
+    Copyright (C) 2023-2025  Moritz Martinius
 
     This program is free software: you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by

src/graphics/Label.cpp

@@ -1,6 +1,6 @@
 /* 
     ptrnt - print labels on linux
-    Copyright (C) 2023  Moritz Martinius
+    Copyright (C) 2023-2025  Moritz Martinius
 
     This program is free software: you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by

src/graphics/Label.hpp

@@ -1,6 +1,6 @@
 /* 
     ptrnt - print labels on linux
-    Copyright (C) 2023  Moritz Martinius
+    Copyright (C) 2023-2025  Moritz Martinius
 
     This program is free software: you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by

src/graphics/LabelBuilder.cpp

@@ -0,0 +1,95 @@
+/*
+    ptrnt - print labels on linux
+    Copyright (C) 2025  Moritz Martinius
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+ */
+
+#include "LabelBuilder.hpp"
+
+#include <spdlog/spdlog.h>
+
+#include "Label.hpp"
+
+namespace ptprnt::graphics {
+
+LabelBuilder::LabelBuilder(int printerHeight) : mPrinterHeight(printerHeight) {
+    reset();
+}
+
+ILabelBuilder& LabelBuilder::addText(const std::string& text) {
+    if (!text.empty()) {
+        if (!mAccumulatedText.empty()) {
+            // Add a newline if the label already has some text accumulated
+            mAccumulatedText += '\n';
+        }
+        mAccumulatedText += text;
+        spdlog::debug("LabelBuilder: Added text '{}', total length: {}", text, mAccumulatedText.length());
+    }
+    return *this;
+}
+
+ILabelBuilder& LabelBuilder::setFontFamily(const std::string& fontFamily) {
+    mCurrentFontFamily = fontFamily;
+    spdlog::debug("LabelBuilder: Set font family to '{}'", fontFamily);
+    return *this;
+}
+
+ILabelBuilder& LabelBuilder::setFontSize(double fontSize) {
+    mCurrentFontSize = fontSize;
+    spdlog::debug("LabelBuilder: Set font size to {}", fontSize);
+    return *this;
+}
+
+ILabelBuilder& LabelBuilder::setHAlign(HAlignPosition hAlign) {
+    mCurrentHAlign = hAlign;
+    spdlog::debug("LabelBuilder: Set horizontal alignment to {}", static_cast<int>(hAlign));
+    return *this;
+}
+
+ILabelBuilder& LabelBuilder::setVAlign(VAlignPosition vAlign) {
+    mCurrentVAlign = vAlign;
+    spdlog::debug("LabelBuilder: Set vertical alignment to {}", static_cast<int>(vAlign));
+    return *this;
+}
+
+std::unique_ptr<ILabel> LabelBuilder::build() {
+    spdlog::debug("LabelBuilder: Building label with text: '{}'", mAccumulatedText);
+
+    auto label = std::make_unique<Label>(mPrinterHeight);
+
+    // Apply current formatting settings
+    label->setFontFamily(mCurrentFontFamily);
+    label->setFontSize(mCurrentFontSize);
+    label->setHAlign(mCurrentHAlign);
+    label->setVAlign(mCurrentVAlign);
+
+    // Create the label with accumulated text
+    label->create(mAccumulatedText);
+
+    return label;
+}
+
+ILabelBuilder& LabelBuilder::reset() {
+    mAccumulatedText.clear();
+    mCurrentFontFamily = DEFAULT_FONT_FAMILY;
+    mCurrentFontSize   = DEFAULT_FONT_SIZE;
+    mCurrentHAlign     = HAlignPosition::LEFT;
+    mCurrentVAlign     = VAlignPosition::MIDDLE;
+    spdlog::debug("LabelBuilder: Reset to default state");
+    return *this;
+}
+
+}  // namespace ptprnt::graphics

src/graphics/LabelBuilder.hpp

@@ -0,0 +1,64 @@
+/*
+    ptrnt - print labels on linux
+    Copyright (C) 2025  Moritz Martinius
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+ */
+
+#pragma once
+
+#include <memory>
+#include <string>
+#include <vector>
+
+#include "interface/ILabel.hpp"
+#include "interface/ILabelBuilder.hpp"
+
+namespace ptprnt::graphics {
+
+/**
+ * @brief Concrete implementation of ILabelBuilder
+ *
+ * Builds labels by accumulating text segments with formatting options,
+ * then creates a Label instance with all the collected content.
+ */
+class LabelBuilder : public ILabelBuilder {
+   public:
+    /**
+     * @brief Construct a LabelBuilder for a specific printer height
+     * @param printerHeight Height of the printer in pixels (tape width)
+     */
+    explicit LabelBuilder(int printerHeight);
+
+    ~LabelBuilder() override = default;
+
+    ILabelBuilder& addText(const std::string& text) override;
+    ILabelBuilder& setFontFamily(const std::string& fontFamily) override;
+    ILabelBuilder& setFontSize(double fontSize) override;
+    ILabelBuilder& setHAlign(HAlignPosition hAlign) override;
+    ILabelBuilder& setVAlign(VAlignPosition vAlign) override;
+    std::unique_ptr<ILabel> build() override;
+    ILabelBuilder& reset() override;
+
+   private:
+    int mPrinterHeight;
+    std::string mAccumulatedText;
+    std::string mCurrentFontFamily{DEFAULT_FONT_FAMILY};
+    double mCurrentFontSize{DEFAULT_FONT_SIZE};
+    HAlignPosition mCurrentHAlign{HAlignPosition::LEFT};
+    VAlignPosition mCurrentVAlign{VAlignPosition::MIDDLE};
+};
+
+}  // namespace ptprnt::graphics

src/graphics/Monochrome.cpp

@@ -1,6 +1,6 @@
 /* 
     ptrnt - print labels on linux
-    Copyright (C) 2023  Moritz Martinius
+    Copyright (C) 2023-2025  Moritz Martinius
 
     This program is free software: you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by

src/graphics/Monochrome.hpp

@@ -1,6 +1,6 @@
 /* 
     ptrnt - print labels on linux
-    Copyright (C) 2023  Moritz Martinius
+    Copyright (C) 2023-2025  Moritz Martinius
 
     This program is free software: you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by

src/graphics/interface/ILabel.hpp

@@ -1,6 +1,6 @@
 /* 
     ptrnt - print labels on linux
-    Copyright (C) 2023  Moritz Martinius
+    Copyright (C) 2024-2025  Moritz Martinius
 
     This program is free software: you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by

src/graphics/interface/ILabelBuilder.hpp

@@ -0,0 +1,88 @@
+/*
+    ptrnt - print labels on linux
+    Copyright (C) 2025  Moritz Martinius
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+ */
+
+#pragma once
+
+#include <memory>
+#include <string>
+
+#include "ILabel.hpp"
+
+namespace ptprnt::graphics {
+
+/**
+ * @brief Builder interface for creating labels with text and formatting options
+ *
+ * The LabelBuilder provides a fluent API for constructing labels with various
+ * text elements, fonts, sizes, and alignment options. It separates the construction
+ * logic from the label rendering logic, making it easier to test and maintain.
+ */
+class ILabelBuilder {
+   public:
+    virtual ~ILabelBuilder() = default;
+
+    /**
+     * @brief Add text to the label with current formatting settings
+     * @param text The text to add
+     * @return Reference to this builder for method chaining
+     */
+    virtual ILabelBuilder& addText(const std::string& text) = 0;
+
+    /**
+     * @brief Set the font family for subsequent text additions
+     * @param fontFamily Font family name (e.g., "sans", "serif", "monospace")
+     * @return Reference to this builder for method chaining
+     */
+    virtual ILabelBuilder& setFontFamily(const std::string& fontFamily) = 0;
+
+    /**
+     * @brief Set the font size for subsequent text additions
+     * @param fontSize Font size in points
+     * @return Reference to this builder for method chaining
+     */
+    virtual ILabelBuilder& setFontSize(double fontSize) = 0;
+
+    /**
+     * @brief Set horizontal alignment for subsequent text additions
+     * @param hAlign Horizontal alignment position
+     * @return Reference to this builder for method chaining
+     */
+    virtual ILabelBuilder& setHAlign(HAlignPosition hAlign) = 0;
+
+    /**
+     * @brief Set vertical alignment for subsequent text additions
+     * @param vAlign Vertical alignment position
+     * @return Reference to this builder for method chaining
+     */
+    virtual ILabelBuilder& setVAlign(VAlignPosition vAlign) = 0;
+
+    /**
+     * @brief Build and return the label with all added content
+     * @return Unique pointer to the constructed label
+     */
+    virtual std::unique_ptr<ILabel> build() = 0;
+
+    /**
+     * @brief Reset the builder to initial state
+     * @return Reference to this builder for method chaining
+     */
+    virtual ILabelBuilder& reset() = 0;
+};
+
+}  // namespace ptprnt::graphics

src/interface/IPrinterDriver.hpp

@@ -1,6 +1,6 @@
 /* 
     ptrnt - print labels on linux
-    Copyright (C) 2023  Moritz Martinius
+    Copyright (C) 2023-2025  Moritz Martinius
 
     This program is free software: you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by

src/interface/IPrinterTypes.hpp

@@ -1,6 +1,6 @@
 /* 
     ptrnt - print labels on linux
-    Copyright (C) 2023  Moritz Martinius
+    Copyright (C) 2023-2024  Moritz Martinius
 
     This program is free software: you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by

src/libusbwrap/LibUsbTypes.hpp

@@ -1,6 +1,6 @@
 /* 
     ptrnt - print labels on linux
-    Copyright (C) 2023  Moritz Martinius
+    Copyright (C) 2023-2024  Moritz Martinius
 
     This program is free software: you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by

src/libusbwrap/UsbDevice.cpp

@@ -1,6 +1,6 @@
 /* 
     ptrnt - print labels on linux
-    Copyright (C) 2023  Moritz Martinius
+    Copyright (C) 2023-2024  Moritz Martinius
 
     This program is free software: you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by

src/libusbwrap/UsbDevice.hpp

@@ -1,6 +1,6 @@
 /* 
     ptrnt - print labels on linux
-    Copyright (C) 2023  Moritz Martinius
+    Copyright (C) 2023-2024  Moritz Martinius
 
     This program is free software: you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by

src/libusbwrap/UsbDeviceFactory.cpp

@@ -1,6 +1,6 @@
 /* 
     ptrnt - print labels on linux
-    Copyright (C) 2023  Moritz Martinius
+    Copyright (C) 2023-2025  Moritz Martinius
 
     This program is free software: you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by

src/libusbwrap/interface/IUsbDevice.hpp

@@ -1,3 +1,22 @@
+/* 
+    ptrnt - print labels on linux
+    Copyright (C) 2023-2024  Moritz Martinius
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+ */
+
 #pragma once
 
 #include <sys/types.h>

src/libusbwrap/interface/IUsbDeviceFactory.hpp

@@ -1,3 +1,22 @@
+/* 
+    ptrnt - print labels on linux
+    Copyright (C) 2023  Moritz Martinius
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+ */
+
 #pragma once
 
 #include <cstdint>
@@ -9,8 +28,8 @@
 namespace libusbwrap {
 class IUsbDeviceFactory {
    public:
-    virtual ~IUsbDeviceFactory()                                      = default;
-    virtual std::vector<std::unique_ptr<IUsbDevice>> findAllDevices() = 0;
+    virtual ~IUsbDeviceFactory()                                                             = default;
+    virtual std::vector<std::unique_ptr<IUsbDevice>> findAllDevices()                        = 0;
     virtual std::vector<std::unique_ptr<IUsbDevice>> findDevices(uint16_t vid, uint16_t pid) = 0;
 };
 }  // namespace libusbwrap

src/main.cpp

@@ -1,6 +1,6 @@
 /* 
     ptrnt - print labels on linux
-    Copyright (C) 2023  Moritz Martinius
+    Copyright (C) 2022-2023  Moritz Martinius
 
     This program is free software: you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by

src/meson.build

@@ -12,6 +12,7 @@ ptprnt_hpps = files (
     'PrinterDriverFactory.hpp',
     'graphics/Bitmap.hpp',
     'graphics/Label.hpp',
+    'graphics/LabelBuilder.hpp',
     'graphics/Monochrome.hpp'
 )
 
@@ -21,6 +22,7 @@ ptprnt_srcs = files (
     'printers/P700Printer.cpp',
     'printers/FakePrinter.cpp',
     'graphics/Label.cpp',
+    'graphics/LabelBuilder.cpp',
     'graphics/Bitmap.cpp',
     'graphics/Monochrome.cpp',
     'libusbwrap/UsbDeviceFactory.cpp',

src/printers/FakePrinter.cpp

@@ -1,6 +1,6 @@
 /*
     ptrnt - print labels on linux
-    Copyright (C) 2023  Moritz Martinius
+    Copyright (C) 2025  Moritz Martinius
 
     This program is free software: you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by

src/printers/FakePrinter.hpp

@@ -1,6 +1,6 @@
 /*
     ptrnt - print labels on linux
-    Copyright (C) 2023  Moritz Martinius
+    Copyright (C) 2025  Moritz Martinius
 
     This program is free software: you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by

src/printers/P700Printer.cpp

@@ -1,6 +1,6 @@
 /*
     ptrnt - print labels on linux
-    Copyright (C) 2023  Moritz Martinius
+    Copyright (C) 2025  Moritz Martinius
 
     This program is free software: you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by

src/printers/P700Printer.hpp

@@ -1,6 +1,6 @@
 /* 
     ptrnt - print labels on linux
-    Copyright (C) 2023  Moritz Martinius
+    Copyright (C) 2025  Moritz Martinius
 
     This program is free software: you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by

update_copyright.sh

@@ -0,0 +1,115 @@
+#!/bin/bash
+
+# update_copyright.sh
+# Updates copyright year ranges in a source file based on git history
+#
+# Usage: ./update_copyright.sh [--dry-run] <file>
+#
+# Examples:
+#   # Update a single file
+#   ./update_copyright.sh src/main.cpp
+#
+#   # Dry-run on a single file
+#   ./update_copyright.sh --dry-run src/main.cpp
+#
+#   # Update all C++ files using find -exec
+#   find src \( -name "*.cpp" -o -name "*.hpp" \) -exec ./update_copyright.sh {} \;
+#
+#   # Dry-run on all C++ files
+#   find src \( -name "*.cpp" -o -name "*.hpp" \) -exec ./update_copyright.sh --dry-run {} \;
+
+set -e
+
+# Check for dry-run flag
+DRY_RUN=false
+FILE=""
+
+if [ "$1" = "--dry-run" ]; then
+    DRY_RUN=true
+    FILE="$2"
+elif [ "$1" = "--help" ] || [ "$1" = "-h" ]; then
+    grep "^#" "$0" | sed 's/^# \?//'
+    exit 0
+else
+    FILE="$1"
+fi
+
+# Check if file argument provided
+if [ -z "$FILE" ]; then
+    echo "Error: No file specified"
+    echo "Usage: $0 [--dry-run] <file>"
+    echo "Run '$0 --help' for more information"
+    exit 1
+fi
+
+# Check if file exists
+if [ ! -f "$FILE" ]; then
+    echo "Error: File not found: $FILE"
+    exit 1
+fi
+
+# Get the repository root
+REPO_ROOT=$(git rev-parse --show-toplevel)
+cd "$REPO_ROOT"
+
+# Copyright holder name
+COPYRIGHT_HOLDER="Moritz Martinius"
+
+# Function to get first and last commit years for a file
+get_years_for_file() {
+    local file="$1"
+
+    # Get the year of the first commit that touched this file
+    first_year=$(git log --follow --format=%ad --date=format:%Y --reverse "$file" 2>/dev/null | head -1)
+
+    # Get the year of the last commit that touched this file
+    last_year=$(git log --follow --format=%ad --date=format:%Y -1 "$file" 2>/dev/null)
+
+    # If file is not in git, use current year
+    if [ -z "$first_year" ]; then
+        first_year=$(date +%Y)
+        last_year=$(date +%Y)
+    fi
+
+    echo "$first_year $last_year"
+}
+
+# Get years from git history
+read -r first_year last_year <<< "$(get_years_for_file "$FILE")"
+
+# Determine the copyright year string
+if [ "$first_year" = "$last_year" ]; then
+    year_string="$first_year"
+else
+    year_string="$first_year-$last_year"
+fi
+
+# Check if file has a copyright notice
+if ! grep -q "Copyright (C)" "$FILE"; then
+    echo "No copyright notice found in $FILE, skipping"
+    exit 0
+fi
+
+if [ "$DRY_RUN" = true ]; then
+    # Just show what would be changed
+    current_year=$(grep "Copyright (C)" "$FILE" | sed -n 's/.*Copyright (C) \([0-9]\{4\}\(-[0-9]\{4\}\)\?\).*/\1/p' | head -1)
+    if [ "$current_year" != "$year_string" ]; then
+        echo "Would update $FILE: $current_year → $year_string"
+    else
+        echo "No change needed for $FILE (already $year_string)"
+    fi
+else
+    # Update the copyright line
+    # Matches patterns like "Copyright (C) 2023 Moritz Martinius" or "Copyright (C) 2023-2024 Moritz Martinius"
+    # Handle variable whitespace between year and name
+
+    # Get current year from file for comparison
+    current_year=$(grep "Copyright (C)" "$FILE" | sed -n 's/.*Copyright (C) \([0-9]\{4\}\(-[0-9]\{4\}\)\?\).*/\1/p' | head -1)
+
+    if [ "$current_year" = "$year_string" ]; then
+        echo "No changes needed for $FILE (already $year_string)"
+    else
+        sed -i "s/Copyright (C) [0-9]\{4\}\(-[0-9]\{4\}\)\? \+$COPYRIGHT_HOLDER/Copyright (C) $year_string  $COPYRIGHT_HOLDER/" "$FILE"
+        echo "✓ Updated $FILE: $current_year → $year_string"
+    fi
+fi