path: root/src/fontpack.c

/* Copyright 2021 Jaakko Keränen <jaakko.keranen@iki.fi>

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:

1. Redistributions of source code must retain the above copyright notice, this
   list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright notice,
   this list of conditions and the following disclaimer in the documentation
   and/or other materials provided with the distribution.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */

#include "fontpack.h"
#include "embedded.h"
#include "ui/window.h"
#include "app.h"

#include <the_Foundation/archive.h>
#include <the_Foundation/array.h>
#include <the_Foundation/file.h>
#include <the_Foundation/fileinfo.h>
#include <the_Foundation/path.h>
#include <the_Foundation/ptrarray.h>
#include <the_Foundation/string.h>
#include <the_Foundation/stringlist.h>
#include <the_Foundation/toml.h>

const char *mimeType_FontPack = "application/lagrange-fontpack+zip";

float scale_FontSize(enum iFontSize size) {
    static const float sizes[max_FontSize] = {
        1.000, /* UI sizes */
        1.125,
        1.333,
        1.666,
        0.800,
        0.900,
        1.000, /* document sizes */
        1.200,
        1.333,
        1.666,
        2.000,
        0.650, //0.568,
        0.710, /* calibration: fits the Lagrange title screen with Normal line width */
    };
    if (size < 0 || size >= max_FontSize) {
        return 1.0f;
    }
    return sizes[size];
}

/*----------------------------------------------------------------------------------------------*/

iDefineObjectConstruction(FontFile)

void init_FontFile(iFontFile *d) {
    init_String(&d->id);
    d->style = regular_FontStyle;
    init_Block(&d->sourceData, 0);
    iZap(d->stbInfo);
#if defined (LAGRANGE_ENABLE_HARFBUZZ)
    d->hbBlob = NULL;
    d->hbFace = NULL;
    d->hbFont = NULL;
#endif
}

static void load_FontFile_(iFontFile *d, const iBlock *data) {
    set_Block(&d->sourceData, data);
    stbtt_InitFont(&d->stbInfo, constData_Block(&d->sourceData), 0);
    /* Basic metrics. */
    stbtt_GetFontVMetrics(&d->stbInfo, &d->ascent, &d->descent, NULL);
    stbtt_GetCodepointHMetrics(&d->stbInfo, 'M', &d->emAdvance, NULL);
#if defined(LAGRANGE_ENABLE_HARFBUZZ)
    /* HarfBuzz will read the font data. */
    d->hbBlob = hb_blob_create(constData_Block(&d->sourceData), size_Block(&d->sourceData),
                               HB_MEMORY_MODE_READONLY, NULL, NULL);
    d->hbFace = hb_face_create(d->hbBlob, 0);
    d->hbFont = hb_font_create(d->hbFace);
#endif
}

static void unload_FontFile_(iFontFile *d) {
#if defined(LAGRANGE_ENABLE_HARFBUZZ)
    /* HarfBuzz objects. */
    hb_font_destroy(d->hbFont);
    hb_face_destroy(d->hbFace);
    hb_blob_destroy(d->hbBlob);
    d->hbFont = NULL;
    d->hbFace = NULL;
    d->hbBlob = NULL;
#endif
    clear_Block(&d->sourceData);
    iZap(d->stbInfo);
}

void deinit_FontFile(iFontFile *d) {
    printf("FontFile %p {%s} is DESTROYED\n", d, cstr_String(&d->id));
    unload_FontFile_(d);
    deinit_Block(&d->sourceData);
    deinit_String(&d->id);
}

float scaleForPixelHeight_FontFile(const iFontFile *d, int pixelHeight) {
    return stbtt_ScaleForPixelHeight(&d->stbInfo, pixelHeight);
}

uint8_t *rasterizeGlyph_FontFile(const iFontFile *d, float xScale, float yScale, float xShift,
                                 uint32_t glyphIndex, int *w, int *h) {
    return stbtt_GetGlyphBitmapSubpixel(
        &d->stbInfo, xScale, yScale, xShift, 0.0f, glyphIndex, w, h, 0, 0);
}

void measureGlyph_FontFile(const iFontFile *d, uint32_t glyphIndex,
                           float xScale, float yScale, float xShift,
                           int *x0, int *y0, int *x1, int *y1) {
    stbtt_GetGlyphBitmapBoxSubpixel(
        &d->stbInfo, glyphIndex, xScale, yScale, xShift, 0.0f, x0, y0, x1, y1);
}

/*----------------------------------------------------------------------------------------------*/

iDefineTypeConstruction(FontSpec)
    
void init_FontSpec(iFontSpec *d) {
    init_String(&d->id);
    init_String(&d->name);
    init_String(&d->sourcePath);
    d->flags      = 0;
    d->priority   = 0;
    for (int i = 0; i < 2; ++i) {
        d->heightScale[i]     = 1.0f;
        d->glyphScale[i]      = 1.0f;
        d->vertOffsetScale[i] = 1.0f;
    }
    iZap(d->styles);
}

void deinit_FontSpec(iFontSpec *d) {
    /* FontFile references are held by FontSpecs. */
    iForIndices(i, d->styles) {
        iRelease(d->styles[i]);
    }
    deinit_String(&d->sourcePath);
    deinit_String(&d->name);
    deinit_String(&d->id);
}

/*----------------------------------------------------------------------------------------------*/

iDeclareType(Fonts)

struct Impl_Fonts {
    iString   userDir;
    iPtrArray packs;
    iObjectList *files;
    iPtrArray specOrder; /* specs sorted by priority */
};

static iFonts fonts_;

static void unloadFiles_Fonts_(iFonts *d) {
    /* TODO: Mark all files in font packs as not resident. */    
    clear_ObjectList(d->files);
}

static iFontFile *findFile_Fonts_(iFonts *d, const iString *id) {
    iForEach(ObjectList, i, d->files) {
        iFontFile *ff = i.object;
        if (equal_String(&ff->id, id)) {
            return ff;
        }
    }
    return NULL;
}

static void releaseUnusedFiles_Fonts_(iFonts *d) {
    iForEach(ObjectList, i, d->files) {
        iFontFile *ff = i.object;
        if (ff->object.refCount == 1) {
            /* No specs use this. */
            //printf("[Fonts] releasing unused font file: %p {%s}\n", ff, cstr_String(&ff->id));
            remove_ObjectListIterator(&i);
        }
    }
}

/*----------------------------------------------------------------------------------------------*/

struct Impl_FontPack {
    iString         id; /* lowercase filename without the .fontpack extension */
    int             version;
    iBool           isStandalone;
    iBool           isReadOnly;
    iArray          fonts;   /* array of FontSpecs */
    const iArchive *archive; /* opened ZIP archive */
    iString *       loadPath;
    iFontSpec *     loadSpec;
};

iDefineTypeConstruction(FontPack)

void init_FontPack(iFontPack *d) {
    init_String(&d->id);
    d->version = 0;
    d->isStandalone = iFalse;
    d->isReadOnly = iFalse;
    init_Array(&d->fonts, sizeof(iFontSpec));
    d->archive  = NULL;
    d->loadSpec = NULL;
    d->loadPath = NULL;
}

void deinit_FontPack(iFontPack *d) {
    iAssert(d->archive == NULL);
    iAssert(d->loadSpec == NULL);
    delete_String(d->loadPath);
    iForEach(Array, i, &d->fonts) {
        deinit_FontSpec(i.value);
    }
    deinit_Array(&d->fonts);
    deinit_String(&d->id);
    releaseUnusedFiles_Fonts_(&fonts_);
}

iFontPackId id_FontPack(const iFontPack *d) {
    return (iFontPackId){ &d->id, d->version };
}

const iString *loadPath_FontPack(const iFontPack *d) {
    return d->loadPath;
}

const iPtrArray *listSpecs_FontPack(const iFontPack *d) {
    if (!d) return NULL;
    iPtrArray *list = collectNew_PtrArray();
    iConstForEach(Array, i, &d->fonts) {
        pushBack_PtrArray(list, i.value);
    }
    return list;
}

void handleIniTable_FontPack_(void *context, const iString *table, iBool isStart) {
    iFontPack *d = context;
    if (isStart) {
        iAssert(!d->loadSpec);
        /* Each font ID must be unique in the non-standalone packs. */
        if (d->isStandalone || !findSpec_Fonts(cstr_String(table))) {
            d->loadSpec = new_FontSpec();
            set_String(&d->loadSpec->id, table);
            if (d->loadPath) {
                set_String(&d->loadSpec->sourcePath, d->loadPath);
            }
        }
    }
    else if (d->loadSpec) {
        /* Set fallback font files. */ {
            const iFontFile **styles = d->loadSpec->styles;
            if (!styles[regular_FontStyle]) {
                fprintf(stderr, "[FontPack] \"%s\" missing a regular style font file\n",
                        cstr_String(table));
                delete_FontSpec(d->loadSpec);
                d->loadSpec = NULL;
                return;
            }
            if (!styles[semiBold_FontStyle]) {
                styles[semiBold_FontStyle] = ref_Object(styles[bold_FontStyle]);
            }
            for (size_t s = 0; s < max_FontStyle; s++) {
                if (!styles[s]) {
                    styles[s] = ref_Object(styles[regular_FontStyle]);
                }
            }
        }
        pushBack_Array(&d->fonts, d->loadSpec);
        d->loadSpec = NULL;
    }   
}

static iBlock *readFile_FontPack_(const iFontPack *d, const iString *path) {
    iBlock *data = NULL;
    if (d->archive) {
        /* Loading from a ZIP archive. */
        data = copy_Block(data_Archive(d->archive, path));
    }
    else if (d->loadPath) {
        /* Loading from a regular file. */
        iFile *srcFile = new_File(collect_String(concat_Path(d->loadPath, path)));
        if (open_File(srcFile, readOnly_FileMode)) {
            data = readAll_File(srcFile);
        }
        iRelease(srcFile);
        return data;
    }
    return data;
}

void handleIniKeyValue_FontPack_(void *context, const iString *table, const iString *key,
                                 const iTomlValue *value) {
    iFontPack *d = context;
    if (isEmpty_String(table)) {
        if (!cmp_String(key, "version")) {
            d->version = number_TomlValue(value);
        }
        return;
    }
    if (!d->loadSpec) {
        return;
    }
    iUnused(table);
    if (!cmp_String(key, "name") && value->type == string_TomlType) {
        set_String(&d->loadSpec->name, value->value.string);        
    }
    else if (!cmp_String(key, "priority") && value->type == int64_TomlType) {
        d->loadSpec->priority = (int) value->value.int64;        
    }
    else if (!cmp_String(key, "height")) {
        d->loadSpec->heightScale[0] = d->loadSpec->heightScale[1] =
            iMin(2.0f, (float) number_TomlValue(value));
    }
    else if (!cmp_String(key, "glyphscale")) {
        d->loadSpec->glyphScale[0] = d->loadSpec->glyphScale[1] = (float) number_TomlValue(value);
    }
    else if (!cmp_String(key, "voffset")) {
        d->loadSpec->vertOffsetScale[0] = d->loadSpec->vertOffsetScale[1] =
            (float) number_TomlValue(value);
    }
    else if (startsWith_String(key, "ui.") || startsWith_String(key, "doc.")) {
        const int scope = startsWith_String(key, "ui.") ? 0 : 1;        
        if (endsWith_String(key, ".height")) {
            d->loadSpec->heightScale[scope] = iMin(2.0f, (float) number_TomlValue(value));
        }
        if (endsWith_String(key, ".glyphscale")) {
            d->loadSpec->glyphScale[scope] = (float) number_TomlValue(value);
        }
        else if (endsWith_String(key, ".voffset")) {
            d->loadSpec->vertOffsetScale[scope] = (float) number_TomlValue(value);
        }
    }
    else if (!cmp_String(key, "override") && value->type == boolean_TomlType) {
        iChangeFlags(d->loadSpec->flags, override_FontSpecFlag, value->value.boolean);
    }
    else if (!cmp_String(key, "monospace") && value->type == boolean_TomlType) {
        iChangeFlags(d->loadSpec->flags, monospace_FontSpecFlag, value->value.boolean);
    }
    else if (!cmp_String(key, "auxiliary") && value->type == boolean_TomlType) {
        iChangeFlags(d->loadSpec->flags, auxiliary_FontSpecFlag, value->value.boolean);
    }
    else if (!cmp_String(key, "allowspace") && value->type == boolean_TomlType) {
        iChangeFlags(d->loadSpec->flags, allowSpacePunct_FontSpecFlag, value->value.boolean);
    }
    else if (!cmp_String(key, "tweaks")) {
        iChangeFlags(d->loadSpec->flags, fixNunitoKerning_FontSpecFlag,
                     ((int) number_TomlValue(value)) & 1);
    }
    else if (value->type == string_TomlType) {
        const char *styles[max_FontStyle] = { "regular", "italic", "light", "semibold", "bold" };
        iForIndices(i, styles) {
            if (!cmp_String(key, styles[i]) && !d->loadSpec->styles[i]) {
                iFontFile *ff = NULL;
                iString *fontFileId = concat_Path(d->loadPath, value->value.string);
                if (!(ff = findFile_Fonts_(&fonts_, fontFileId))) {
                    iBlock *data = readFile_FontPack_(d, value->value.string);
                    if (data) {
                        ff = new_FontFile();
                        set_String(&ff->id, fontFileId);
                        load_FontFile_(ff, data);
                        pushBack_ObjectList(fonts_.files, ff); /* centralized ownership */
                        iRelease(ff);
                        delete_Block(data);
//                        printf("[FontPack] loaded file: %s\n", cstr_String(fontFileId));
                    }
                }
                d->loadSpec->styles[i] = ref_Object(ff);
                delete_String(fontFileId);
                break;
            }
        }
    }
}

static iBool load_FontPack_(iFontPack *d, const iString *ini) {
    iBeginCollect();
    iBool ok = iFalse;
    iTomlParser *toml = collect_TomlParser(new_TomlParser());
    setHandlers_TomlParser(toml, handleIniTable_FontPack_, handleIniKeyValue_FontPack_, d);
    if (parse_TomlParser(toml, ini)) {
        ok = iTrue;
    }
    iAssert(d->loadSpec == NULL);
    iEndCollect();
    return ok;
}

iBool detect_FontPack(const iBlock *data) {
    iBool ok = iFalse;
    iArchive *zip = new_Archive();
    if (openData_Archive(zip, data)) {
        iString ini;
        initBlock_String(&ini, dataCStr_Archive(zip, "fontpack.ini"));
        if (isUtf8_Rangecc(range_String(&ini))) {
            /* Validate the TOML syntax without actually checking any values. */
            iTomlParser *toml = new_TomlParser();
            ok = parse_TomlParser(toml, &ini);
            delete_TomlParser(toml);
        }
        deinit_String(&ini);
    }
    iRelease(zip);
    return ok;
}

iBool loadArchive_FontPack(iFontPack *d, const iArchive *zip) {
    d->archive = zip;
    iBool ok = iFalse;
    const iBlock *iniData = dataCStr_Archive(zip, "fontpack.ini");
    if (iniData) {
        iString ini;
        initBlock_String(&ini, iniData);
        if (load_FontPack_(d, &ini)) {
            ok = iTrue;
        }
        deinit_String(&ini);
    }
    d->archive = NULL;
    return ok;
}

void setLoadPath_FontPack(iFontPack *d, const iString *path) {
    if (!d->loadPath) {
        d->loadPath = new_String();
    }
    set_String(d->loadPath, path);
    /* Pack ID is based on the file name. */
    setRange_String(&d->id, baseName_Path(path));
    setRange_String(&d->id, withoutExtension_Path(&d->id));
}

const iString *idFromUrl_FontPack(const iString *url) {
    iString *id = new_String();
    iUrl parts;
    init_Url(&parts, url);
    setRange_String(id, baseName_Path(collectNewRange_String(parts.path)));
    setRange_String(id, withoutExtension_Path(id));
    return collect_String(id);
}

void setUrl_FontPack(iFontPack *d, const iString *url) {
    /* TODO: Should we remember the URL as well? */
    set_String(&d->id, idFromUrl_FontPack(url));
}

void setStandalone_FontPack(iFontPack *d, iBool standalone) {
    d->isStandalone = standalone;
}

void setReadOnly_FontPack(iFontPack *d, iBool readOnly) {
    d->isReadOnly = readOnly;
}

iBool isReadOnly_FontPack(const iFontPack *d) {
    return d->isReadOnly;
}

/*----------------------------------------------------------------------------------------------*/

static void unloadFonts_Fonts_(iFonts *d) {
    iForEach(PtrArray, i, &d->packs) {
        iFontPack *pack = i.ptr;
        delete_FontPack(pack);
    }
    clear_PtrArray(&d->packs);
}

static int cmpName_FontSpecPtr_(const void *a, const void *b) {
    const iFontSpec **p1 = (const iFontSpec **) a, **p2 = (const iFontSpec **) b;
    return cmpStringCase_String(&(*p1)->name, &(*p2)->name);
}

static int cmpPriority_FontSpecPtr_(const void *a, const void *b) {
    const iFontSpec **p1 = (const iFontSpec **) a, **p2 = (const iFontSpec **) b;
    const int cmp = -iCmp((*p1)->priority, (*p2)->priority); /* highest priority first */
    if (cmp) return cmp;
    return cmpName_FontSpecPtr_(a, b);
}

static int cmpSourceAndPriority_FontSpecPtr_(const void *a, const void *b) {
    const iFontSpec **p1 = (const iFontSpec **) a, **p2 = (const iFontSpec **) b;
    const int cmp = cmpStringCase_String(&(*p1)->sourcePath, &(*p2)->sourcePath);
    if (cmp) return cmp;
    return cmpPriority_FontSpecPtr_(a, b);
}

static void sortSpecs_Fonts_(iFonts *d) {
    clear_PtrArray(&d->specOrder);
    iConstForEach(PtrArray, p, &d->packs) {
        const iFontPack *pack = p.ptr;
        if (!isDisabled_FontPack(pack)) {
            iConstForEach(Array, i, &pack->fonts) {
                pushBack_PtrArray(&d->specOrder, i.value);
            }
        }
    }
    sort_Array(&d->specOrder, cmpPriority_FontSpecPtr_);
}

static const iString *userFontsDirectory_Fonts_(const iFonts *d) {
    return collect_String(concatCStr_Path(&d->userDir, "fonts"));
}

void init_Fonts(const char *userDir) {
    iFonts *d = &fonts_;
    initCStr_String(&d->userDir, userDir);
    const iString *userFontsDir = userFontsDirectory_Fonts_(d);
    makeDirs_Path(userFontsDir);
    init_PtrArray(&d->packs);
    d->files = new_ObjectList();
    init_PtrArray(&d->specOrder);
    /* Load the required fonts. */ {
        iFontPack *pack = new_FontPack();
        setCStr_String(&pack->id, "default");
        iArchive *arch = new_Archive();
        setReadOnly_FontPack(pack, iTrue);
        openData_Archive(arch, &fontpackDefault_Embedded);
        loadArchive_FontPack(pack, arch); /* should never fail if we've made it this far */
        iRelease(arch);
        pushBack_PtrArray(&d->packs, pack);
    }
    /* Find and load .fontpack files in known locations. */ {
        const char *locations[] = {
            ".",
            "./fonts",
            "../share/lagrange", /* Note: These must match CMakeLists.txt install destination */
            "../../share/lagrange",
            cstr_String(userFontsDir),
            userDir,
        };
        const iString *execDir = collectNewRange_String(dirName_Path(execPath_App()));
        iForIndices(i, locations) {
            const iString *dir = concatCStr_Path(execDir, locations[i]);
            iForEach(DirFileInfo, entry, iClob(new_DirFileInfo(dir))) {
                const iString *entryPath = path_FileInfo(entry.value);
                if (endsWithCase_String(entryPath, ".fontpack")) {
                    iArchive *arch = new_Archive();
                    if (openFile_Archive(arch, entryPath)) {
                        iFontPack *pack = new_FontPack();
                        setLoadPath_FontPack(pack, entryPath);
                        setReadOnly_FontPack(pack, !isWritable_FileInfo(entry.value));
#if defined (iPlatformApple)
                        if (startsWith_String(pack->loadPath, cstr_String(execDir))) {
                            setReadOnly_FontPack(pack, iTrue);
                        }
#endif
                        if (loadArchive_FontPack(pack, arch)) {
                            pushBack_PtrArray(&d->packs, pack);
                        }
                        else {
                            delete_FontPack(pack);
                            fprintf(stderr,
                                    "[fonts] errors detected in fontpack: %s\n",
                                    cstr_String(entryPath));
                        }
                    }
                    iRelease(arch);
                }
            }
        }
    }
    /* A standalone .ini file in the config directory. */ {
        const iString *userIni = collectNewCStr_String(concatPath_CStr(userDir, "fonts.ini"));
        iFile *f = new_File(userIni);
        if (open_File(f, text_FileMode | readOnly_FileMode)) {
            const iString *src = collect_String(readString_File(f));
            iFontPack *pack = new_FontPack();
            pack->loadPath = copy_String(userIni);
            if (load_FontPack_(pack, src)) {
                pushBack_PtrArray(&d->packs, pack);
            }
            else {
                delete_FontPack(pack);
                fprintf(stderr,
                        "[fonts] errors detected in fonts.ini: %s\n",
                        cstr_String(userIni));                
            }
        }
        iRelease(f);
    }
    sortSpecs_Fonts_(d);
}

void deinit_Fonts(void) {
    iFonts *d = &fonts_;
    unloadFonts_Fonts_(d);
    iAssert(isEmpty_ObjectList(d->files));
    deinit_PtrArray(&d->specOrder);
    deinit_PtrArray(&d->packs);
    iRelease(d->files);
    deinit_String(&d->userDir);
}

const iPtrArray *listPacks_Fonts(void) {
    return &fonts_.packs;
}

const iFontSpec *findSpec_Fonts(const char *fontId) {
    iFonts *d = &fonts_;
    iConstForEach(PtrArray, i, &d->specOrder) {
        const iFontSpec *spec = i.ptr;
        if (!cmp_String(&spec->id, fontId)) {
            return spec;
        }
    }
    return NULL;
}

const iPtrArray *listSpecs_Fonts(iBool (*filterFunc)(const iFontSpec *)) {
    iFonts *d = &fonts_;
    iPtrArray *list = collectNew_PtrArray();
    iConstForEach(PtrArray, i, &d->specOrder) {
        if (filterFunc == NULL || filterFunc(i.ptr)) {
            pushBack_PtrArray(list, i.ptr);
        }
    }
    sort_Array(list, cmpName_FontSpecPtr_);
    return list;
}

const iPtrArray *listSpecsByPriority_Fonts(void) {
    return &fonts_.specOrder;
}

iString *infoText_FontPack(const iFontPack *d) {
    const iFontPack *installed        = pack_Fonts(cstr_String(&d->id));
    const iBool      isInstalled      = (installed != NULL);
    const int        installedVersion = installed ? installed->version : 0;
    const iBool      isDisabled       = isDisabled_FontPack(d);
    iString         *str              = new_String();
    size_t           sizeInBytes      = 0;
    iPtrSet         *uniqueFiles      = new_PtrSet();
    iStringList     *names            = new_StringList();
    iConstForEach(PtrArray, i, listSpecs_FontPack(d)) {
        const iFontSpec *spec = i.ptr;
        pushBack_StringList(names, &spec->name);
        iForIndices(j, spec->styles) {
            insert_PtrSet(uniqueFiles, spec->styles[j]);
        }
    }
    iConstForEach(PtrSet, j, uniqueFiles) {
        sizeInBytes += size_Block(&((const iFontFile *) *j.value)->sourceData);
    }
    appendFormat_String(str, "%.1f ${mb} (%s)\n%s: %s\n",
                        sizeInBytes / 1.0e6,
                        formatCStrs_Lang("num.files.n", size_PtrSet(uniqueFiles)),
                        formatCStrs_Lang("num.fonts.n", size_StringList(names)),
                        cstrCollect_String(joinCStr_StringList(names, ", ")),
                        d->version);
    if (isInstalled && installedVersion != d->version) {
        appendCStr_String(str, format_Lang("${fontpack.meta.version}\n", d->version));
    }
    if (!isEmpty_String(&d->id)) {
        appendFormat_String(str, "%s %s%s\n",
                            isInstalled ? ballotChecked_Icon : ballotUnchecked_Icon,
                            isInstalled ? (installedVersion == d->version ? "${fontpack.meta.installed}"
                                           : format_CStr("${fontpack.meta.installed} (%s)",
                                                         format_Lang("${fontpack.meta.version}",
                                                                     installedVersion)))
                                           : "${fontpack.meta.notinstalled}",
                            isDisabled ? "${fontpack.meta.disabled}" : "");
    }
    iRelease(names);
    delete_PtrSet(uniqueFiles);
    return str;
}

const iArray *actions_FontPack(const iFontPack *d) {
    iArray           *items     = new_Array(sizeof(iMenuItem));
    const iFontPackId fp        = id_FontPack(d);
    const char       *fpId      = cstr_String(fp.id);
    const iFontPack  *installed = pack_Fonts(fpId);
    const iBool       isEnabled = !isDisabled_FontPack(d);
    if (isInstalled_Fonts(fpId)) {
        if (d->version > installed->version) {
            pushBack_Array(items, &(iMenuItem){
                format_Lang(add_Icon " ${fontpack.upgrade}", fpId, d->version),
                SDLK_RETURN, 0, "fontpack.install"
            });
        }
        pushBack_Array(items, &(iMenuItem){
            format_Lang(isEnabled ? close_Icon " ${fontpack.disable}"
                      : leftArrowhead_Icon " ${fontpack.enable}", fpId), 0, 0,
            format_CStr("fontpack.enable arg:%d id:%s", !isEnabled, fpId) });
        if (!d->isReadOnly && installed->loadPath && d->loadPath &&
            !cmpString_String(installed->loadPath, d->loadPath)) {
            pushBack_Array(items, &(iMenuItem){
                format_Lang(delete_Icon " ${fontpack.delete}", fpId), 0, 0,
                format_CStr("fontpack.delete id:%s", fpId) });
        }
    }
    else if (d->isStandalone) {
        pushBack_Array(items, &(iMenuItem){
            format_Lang(add_Icon " ${fontpack.install}", fpId),
            SDLK_RETURN, 0, "fontpack.install"
        });
    }
    return collect_Array(items);
}

iBool isDisabled_FontPack(const iFontPack *d) {
    return contains_StringSet(prefs_App()->disabledFontPacks, &d->id);
}

const iString *infoPage_Fonts(void) {
    iFonts *d = &fonts_;
    iString *str = collectNewCStr_String("# ${heading.fontpack.meta}\n"
         "=> gemini://skyjake.fi/fonts  Download more fonts\n"
         "=> about:command?!open%20newtab:1%20gotoheading:1%20url:about:help  Using fonts in Lagrange\n"
         "=> about:command?!open%20newtab:1%20gotoheading:1%20url:about:help  How to create a fontpack\n");
    iPtrArray *specsByPack = collectNew_PtrArray();
    setCopy_PtrArray(specsByPack, &d->specOrder);
    sort_Array(specsByPack, cmpSourceAndPriority_FontSpecPtr_);
    iString *currentSourcePath = collectNew_String();
    for (int group = 0; group < 2; group++) {
        iBool isFirst = iTrue;
        iConstForEach(PtrArray, i, specsByPack) {
            const iFontSpec *spec = i.ptr;
            if (isEmpty_String(&spec->sourcePath)) {
                continue; /* built-in font */
            }
            if (!equal_String(&spec->sourcePath, currentSourcePath)) {
                set_String(currentSourcePath, &spec->sourcePath);
                /* Print some information about this page. */
                const iFontPack *pack = packByPath_Fonts(currentSourcePath);
                if (pack) {
                    if (!isDisabled_FontPack(pack) ^ group) {
                        if (isFirst) {
                            appendCStr_String(str, "\n## ");
                            appendCStr_String(str, group == 0 ? "${heading.fontpack.meta.enabled}"
                                                              : "${heading.fontpack.meta.disabled}");
                            appendCStr_String(str, "\n\n");
                            isFirst = iFalse;
                        }
                        const iString *packId = id_FontPack(pack).id;
                        appendFormat_String(str, "### %s\n=> %s ${fontpack.meta.viewfile}\n",
                                            isEmpty_String(packId) ? "fonts.ini" :
                                            cstr_String(packId),
                                            cstrCollect_String(makeFileUrl_String(&spec->sourcePath)));
                        append_String(str, collect_String(infoText_FontPack(pack)));
                        iConstForEach(Array, a, actions_FontPack(pack)) {
                            const iMenuItem *item = a.value;
                            appendFormat_String(str, "=> about:command?%s %s\n",
                                                cstr_String(withSpacesEncoded_String(collectNewCStr_String(item->command))),
                                                item->label);
                        }
                    }
                }
            }
        }
    }
    return str;
}

const iFontPack *pack_Fonts(const char *packId) {
    iFonts *d = &fonts_;
    if (!*packId) {
        return NULL;
    }
    iConstForEach(PtrArray, i, &d->packs) {
        const iFontPack *pack = i.ptr;
        if (!cmp_String(&pack->id, packId)) {
            return pack;
        }
    }
    return NULL;
}

const iFontPack *packByPath_Fonts(const iString *path) {
    iFonts *d = &fonts_;
    iConstForEach(PtrArray, i, &d->packs) {
        const iFontPack *pack = i.ptr;
        if (pack->loadPath && equal_String(pack->loadPath, path)) {
            return pack;
        }
    }
    return NULL;
}

void reload_Fonts(void) {
    iFonts *d = &fonts_;
    iString *userDir = copy_String(&d->userDir);
    deinit_Fonts(); /* `d->userDir` is freed */
    init_Fonts(cstr_String(userDir));
    resetFonts_App();
    invalidate_Window(get_MainWindow());
    delete_String(userDir);
}

void install_Fonts(const iString *packId, const iBlock *data) {
    if (!detect_FontPack(data)) {
        return;
    }
    /* Newly installed packs will never be disabled. */
    remove_StringSet(prefs_App()->disabledFontPacks, packId);
    iFonts *d = &fonts_;
    iFile *f = new_File(collect_String(concatCStr_Path(
        userFontsDirectory_Fonts_(d), format_CStr("%s.fontpack", cstr_String(packId)))));
    if (open_File(f, writeOnly_FileMode)) {
        write_File(f, data);
    }
    iRelease(f);
    /* Newly installed fontpacks may have a higher priority that overrides other fonts. */
    reload_Fonts();
}

iDefineClass(FontFile)