1 files changed, 99 insertions, 0 deletions
diff --git a/src/ui/dialog/global-palettes.cpp b/src/ui/dialog/global-palettes.cpp
new file mode 100644
index 0000000..27b337e
--- /dev/null
+++ b/src/ui/dialog/global-palettes.cpp
@@ -0,0 +1,99 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+#include "global-palettes.h"
+
+#include <iomanip>
+
+// Using Glib::regex because
+//  - std::regex is too slow in debug mode.
+//  - boost::regex requires a library not present in the CI image.
+#include <glibmm/i18n.h>
+#include <glibmm/miscutils.h>
+#include <glibmm/regex.h>
+
+#include "io/resource.h"
+#include "io/sys.h"
+
+Inkscape::UI::Dialog::PaletteFileData::PaletteFileData(Glib::ustring const &path)
+{
+    name = Glib::path_get_basename(path);
+    columns = 1;
+    user = Inkscape::IO::file_is_writable(path.c_str());
+
+    auto f = std::unique_ptr<FILE, void(*)(FILE*)>(Inkscape::IO::fopen_utf8name(path.c_str(), "r"), [] (FILE *f) {if (f) std::fclose(f);});
+    if (!f) throw std::runtime_error("Failed to open file");
+
+    char buf[1024];
+    if (!std::fgets(buf, sizeof(buf), f.get())) throw std::runtime_error("File is empty");
+    if (std::strncmp("GIMP Palette", buf, 12) != 0) throw std::runtime_error("First line is wrong");
+
+    static auto const regex_rgb   = Glib::Regex::create("\\s*(\\d+)\\s+(\\d+)\\s+(\\d+)\\s*(?:\\s(.*\\S)\\s*)?$", Glib::REGEX_OPTIMIZE | Glib::REGEX_ANCHORED);
+    static auto const regex_name  = Glib::Regex::create("\\s*Name:\\s*(.*\\S)", Glib::REGEX_OPTIMIZE | Glib::REGEX_ANCHORED);
+    static auto const regex_cols  = Glib::Regex::create("\\s*Columns:\\s*(.*\\S)", Glib::REGEX_OPTIMIZE | Glib::REGEX_ANCHORED);
+    static auto const regex_blank = Glib::Regex::create("\\s*(?:$|#)", Glib::REGEX_OPTIMIZE | Glib::REGEX_ANCHORED);
+
+    while (std::fgets(buf, sizeof(buf), f.get())) {
+        auto line = Glib::ustring(buf); // Unnecessary copy required until using a glibmm with support for string views. TODO: Fix when possible.
+        Glib::MatchInfo match;
+        if (regex_rgb->match(line, match)) { // ::regex_match(line, match, boost::regex(), boost::regex_constants::match_continuous)) {
+            // RGB color, followed by an optional name.
+            Color color;
+            for (int i = 0; i < 3; i++) {
+                color.rgb[i] = std::clamp(std::stoi(match.fetch(i + 1)), 0, 255);
+            }
+            color.name = match.fetch(4);
+
+            if (!color.name.empty()) {
+                // Translate the name if present.
+                color.name = g_dpgettext2(nullptr, "Palette", color.name.c_str());
+            } else {
+                // Otherwise, set the name to be the hex value.
+                color.name = Glib::ustring::compose("#%1%2%3",
+                                 Glib::ustring::format(std::hex, std::setw(2), std::setfill(L'0'), color.rgb[0]),
+                                 Glib::ustring::format(std::hex, std::setw(2), std::setfill(L'0'), color.rgb[1]),
+                                 Glib::ustring::format(std::hex, std::setw(2), std::setfill(L'0'), color.rgb[2])
+                             ).uppercase();
+            }
+
+            colors.emplace_back(std::move(color));
+        } else if (regex_name->match(line, match)) {
+            // Header entry for name.
+            name = match.fetch(1);
+        } else if (regex_cols->match(line, match)) {
+            // Header entry for columns.
+            columns = std::clamp(std::stoi(match.fetch(1)), 1, 1000);
+        } else if (regex_blank->match(line, match)) {
+            // Comment or blank line.
+        } else {
+            // Unrecognised.
+            throw std::runtime_error("Invalid line " + std::string(line));
+        }
+    }
+}
+
+Inkscape::UI::Dialog::GlobalPalettes::GlobalPalettes()
+{
+    // Load the palettes.
+    for (auto &path : Inkscape::IO::Resource::get_filenames(Inkscape::IO::Resource::PALETTES, {".gpl"})) {
+        try {
+            palettes.emplace_back(path);
+        } catch (std::runtime_error const &e) {
+            g_warning("Error loading palette %s: %s", path.c_str(), e.what());
+        } catch (std::logic_error const &e) {
+            g_warning("Error loading palette %s: %s", path.c_str(), e.what());
+        }
+    }
+
+    std::sort(palettes.begin(), palettes.end(), [] (decltype(palettes)::const_reference a, decltype(palettes)::const_reference b) {
+        // Sort by user/system first...
+        if (a.user > b.user) return true;
+        if (b.user > a.user) return false;
+        // ... then by name.
+        return a.name.compare(b.name) < 0;
+    });
+}
+
+Inkscape::UI::Dialog::GlobalPalettes const &Inkscape::UI::Dialog::GlobalPalettes::get()
+{
+    static GlobalPalettes instance;
+    return instance;
+}