Deno Script to check font metrics

Example.md

font_metrics.ts

Check font metrics (unitsPerEm, ascent, descent and lineGap) of the font files in the specified directory. Only works for .ttf and .otf (.ttc not supported).

Required

• Deno
• ttx (fonttool)
• dasel
• jq

Example

deno --allow-read --allow-env --allow-run font_metrics.ts /System/Library/Fonts

This outputs a Markdown table like this:

Name	UnitsPerEm	Ascender	Descender	LineGap
.Zither India Narrow	1000	1083	-451	0
Symbol	2048	1436	-612	0
Geneva	2048	2048	-512	171
.LastResort	2048	1950	-494	0
.SF NS Mono	2048	1980	-432	0
.SF Georgian	2048	1950	-494	0
.SF Hebrew	2048	1950	-494	0
Zapf Dingbats	2048	1667	-362	0
.SF Armenian	2048	1950	-494	0
Apple Braille	2048	1600	-512	171
.Zither India	1000	1083	-451	0
.SF Compact	2048	1950	-494	0
Apple Braille	2048	1600	-512	171
Apple Braille	2048	1600	-512	171
.New York	2048	1950	-494	0
.SF NS Mono	2048	1980	-432	0
.SF NS	2048	1980	-432	0
.SF Camera	2048	1950	-494	0
.SF Armenian Rounded	2048	1950	-494	0
Monaco	2048	2048	-512	171
Apple Symbols	2048	1365	-512	171
.New York	2048	1950	-494	0
.SF Compact	2048	1950	-494	0
.SF Arabic	2048	2050	-494	140
.SF NS Rounded	2048	1980	-432	0
Apple Braille	2048	1600	-512	171
.Keyboard	2048	1980	-432	0
.SF Georgian Rounded	2048	1950	-494	0
.SF Compact Rounded	2048	1950	-494	0
Apple Braille	2048	1600	-512	171
.SF NS	2048	1980	-432	0
.SF Arabic Rounded	2048	2050	-494	140
.SF Hebrew Rounded	2048	1950	-494	0

Example 2

deno --allow-read --allow-env --allow-run font_metrics.ts /System/Library/Fonts/Supplemental

Name	UnitsPerEm	Ascender	Descender	LineGap
Noto Sans Lepcha	1000	1069	-450	0
Webdings	2048	1638	-410	0
Noto Sans Mandaic	1000	724	-423	0
Zapfino	400	750	-601	0
Noto Sans CaucAlban	1000	976	-274	0
Trebuchet MS	2048	1923	-455	0
Noto Sans OldHung	1000	859	-177	0
Georgia	2048	1878	-449	0
Noto Sans Saurashtra	1000	1069	-293	0
Noto Sans Multani	1000	1069	-293	0
Noto Sans Hatran	1000	1069	-293	0
Verdana	2048	2059	-430	0
Bodoni 72 Smallcaps	1000	936	-262	0
Noto Sans InsPahlavi	1000	1069	-352	0
Noto Sans Hanunoo	1000	1069	-293	0
Times New Roman	2048	1825	-443	87
Silom	1000	959	-316	0
Noto Sans Bhaiksuki	1000	960	-460	0
Noto Sans Cham	1000	1117	-351	0
Noto Sans Manichaean	1000	790	-340	0
Noto Sans NKo	1000	1069	-293	0
Verdana	2048	2059	-430	0
Noto Sans Kayah Li	1000	1069	-293	0
Noto Sans Osage	1000	1069	-293	0
Noto Sans Adlam	1000	1069	-293	0
Noto Sans Pahawh Hmong	1000	1069	-293	0
Times New Roman	2048	1825	-443	87
Noto Sans Mro	1000	1069	-293	0
Noto Sans CanAborig	1000	1069	-293	0
Noto Sans Avestan	1000	1069	-293	0
Bradley Hand	1000	850	-399	0
Noto Sans Miao	1000	1142	-350	0
Arial Narrow	2048	1916	-434	0
Noto Sans Bassa Vah	1000	1069	-293	0
STIXGeneral	1000	1055	-455	0
Noto Sans Syriac	1000	926	-486	0
Noto Sans Mende Kikakui	1000	1030	-237	0
AppleGothic	1000	891	-325	0
STIX Two Text	1000	762	-238	250
Noto Sans Lydian	1000	1069	-293	0
DIN Condensed	1000	712	-288	200
Noto Sans Chakma	1000	1140	-320	0
Noto Sans Nabataean	1000	1069	-293	0
Noto Serif Hmong Nyiakeng	1000	1068	-292	0
Farisi	2048	2263	-2000	0
Arial	2048	1854	-434	67
Trebuchet MS	2048	1923	-455	0
Mishafi	2048	1607	-1356	0
Noto Sans Duployan	1000	1069	-293	0
Academy Engraved LET	2048	1400	-1024	0
Noto Sans SoraSomp	1000	1069	-293	0
Trattatello	1000	1150	-662	0
Noto Sans Rejang	1000	1069	-293	0
Noto Sans Ugaritic	1000	743	-381	0
Noto Sans Lycian	1000	1069	-293	0
Big Caslon	1000	934	-257	18
Noto Sans WarangCiti	1000	1042	-100	0
Courier New	2048	1705	-615	0
Noto Sans HanifiRohg	1000	1069	-293	0
Noto Sans Tirhuta	1000	1026	-519	0
STIXIntegralsUpSm	1000	1055	-455	0
STIXGeneral	1000	1055	-455	0
STIXIntegralsUpD	1000	2182	-451	0
Lao Sangam MN	2048	2052	-646	0
Noto Sans Tai Le	1000	1069	-293	0
Noto Sans Thaana	1000	1069	-424	0
Luminari	1000	983	-356	0
STIXVariants	1000	1055	-455	0
STIXSizeOneSym	1000	1588	-363	0
Times New Roman	2048	1825	-443	87
Brush Script MT	2048	1820	-692	0
Noto Sans Javanese	1000	1120	-916	0
Georgia	2048	1878	-449	0
Courier New	2048	1705	-615	0
Arial Unicode MS	2048	2189	-555	0
Chalkduster	905	887	-256	12
STIXIntegralsUpSm	1000	1055	-455	0
STIXIntegralsUpD	1000	2182	-451	0
Noto Sans Sundanese	1000	1069	-368	0
Apple Chancery	2048	2289	-952	0
AppleMyungjo	1025	891	-326	0
STIXSizeOneSym	1000	1588	-363	0
Noto Sans Ol Chiki	1000	1069	-293	0
Noto Sans Gunjala Gondi	1000	1014	-252	0
Noto Sans Carian	1000	1069	-293	0
Arial Narrow	2048	1916	-434	0
Noto Sans Modi	1000	891	-463	0
Noto Sans Meroitic	1000	928	-415	0
STIXNonUnicode	1000	1450	-552	0
Noto Sans Palmyrene	1000	1069	-293	0
Noto Sans PhagsPa	1000	1069	-293	0
Arial Narrow	2048	1916	-434	0
Noto Sans Siddham	1000	1000	-1030	0
Noto Sans Yi	1000	1069	-293	0
Noto Sans PsaPahlavi	1000	737	-554	0
Noto Sans Limbu	1000	1069	-293	0
Noto Sans Cypriot	1000	1069	-293	0
Noto Sans Bamum	1000	1069	-293	0
Noto Sans Lisu	1000	1069	-293	0
Courier New	2048	1705	-615	0
Wingdings 3	2048	1900	-432	0
Noto Sans Mahajani	1000	757	-243	0
Wingdings 2	2048	1727	-432	0
Noto Sans Glagolitic	1000	1069	-293	0
Hoefler Text Ornaments	2000	1613	-416	0
Noto Serif Ahom	1000	980	-675	0
Bodoni Ornaments	1000	810	-191	0
Noto Sans Vai	1000	1069	-293	0
Noto Sans Tagbanwa	1000	1069	-293	0
STIX Two Text	1000	762	-238	250
Skia	2048	1591	-457	0
Noto Sans Phoenician	1000	1069	-293	0
Trebuchet MS	2048	1923	-455	0
STIX Two Math	1000	762	-238	250
Impact	2048	2066	-432	0
Kokonor	2600	2714	-1596	42
Noto Sans Kaithi	1000	1077	-425	0
STIXIntegralsUp	1000	1055	-455	0
Noto Serif Balinese	1000	1069	-726	0
Noto Sans Takri	1000	955	-307	0
Noto Sans Masaram Gondi	1000	1000	-200	0
STIXSizeThreeSym	1000	2604	-510	0
Noto Sans EgyptHiero	1000	1324	-326	0
Noto Sans Samaritan	1000	1069	-293	0
Noto Sans Elbasan	1000	847	-270	0
Party LET	2048	1365	-1024	0
Noto Sans Kharoshthi	1000	1069	-301	0
Tahoma	2048	2049	-423	0
Arial	2048	1854	-434	67
Diwan Thuluth	2048	2071	-1439	0
Noto Sans Tagalog	1000	1069	-293	0
Ayuthaya	2100	2241	-674	0
STIXIntegralsUp	1000	1055	-455	0
Khmer Sangam MN	2048	2294	-1393	380
STIXSizeThreeSym	1000	2604	-510	0
Noto Sans Sharada	1000	925	-455	0
Noto Sans Khojki	1000	1409	-447	0
Noto Sans NewTaiLue	1000	1069	-293	0
Noto Sans InsParthi	1000	1069	-301	0
STIXNonUnicode	1000	1450	-552	0
Trebuchet MS	2048	1923	-455	0
Noto Sans Buhid	1000	1069	-293	0
Arial Black	2048	2254	-634	0
Courier New	2048	1705	-615	0
Comic Sans MS	2048	2257	-597	0
Noto Sans Khudawadi	1000	944	-373	0
Noto Serif Yezidi	1000	1068	-292	0
Noto Sans Buginese	1000	1069	-293	0
Noto Sans Linear B	1000	1069	-293	0
DIN Alternate	2048	1921	-463	0
Wingdings	2048	1841	-432	0
Noto Sans Newa	1000	1036	-396	0
Sathu	1274	1151	-404	0
Noto Sans Syloti Nagri	1000	1069	-293	0
Arial	2048	1854	-434	67
STIXSizeTwoSym	1000	2095	-404	0
Noto Sans OldPersian	1000	1069	-293	0
Tahoma	2048	2049	-423	0
Plantagenet Cherokee	1000	697	-285	74
Georgia	2048	1878	-449	0
Noto Sans Linear A	1000	1069	-293	0
STIXIntegralsSm	1000	1055	-455	0
STIXNonUnicode	1000	1450	-552	0
STIXSizeFourSym	1000	2604	-510	0
Verdana	2048	2059	-430	0
Microsoft Sans Serif	2048	1888	-430	0
Noto Sans Cuneiform	1000	1596	-690	0
Georgia	2048	1878	-449	0
Noto Sans Batak	1000	1069	-293	0
Arial Rounded MT Bold	2048	1938	-432	0
Times New Roman	2048	1825	-443	87
STIXSizeTwoSym	1000	2095	-404	0
Noto Sans Wancho	1000	1096	-161	0
STIXGeneral	1000	1042	-455	0
Krungthep	2560	2587	-672	0
Noto Sans OldSouArab	1000	1069	-293	0
STIXSizeFourSym	1000	2604	-510	0
STIXIntegralsSm	1000	1055	-455	0
Noto Sans PauCinHau	1000	1069	-293	0
Noto Sans Marchen	1000	1107	-534	0
Noto Sans Old Italic	1000	1069	-293	0
Noto Sans Gothic	1000	1069	-293	0
Gurmukhi MT	2048	1770	-900	0
STIXNonUnicode	1000	1450	-552	0
Andale Mono	2048	1858	-446	0
Mishafi Gold	2048	1607	-1356	0
Herculanum	1000	795	-205	0
Noto Sans Tai Viet	1000	1069	-293	0
Noto Sans ImpAramaic	1000	1069	-293	0
STIXIntegralsD	1000	2182	-451	0
Noto Sans Brahmi	1000	1069	-306	0
STIXVariants	1000	1055	-455	0
Comic Sans MS	2048	2257	-597	0
Noto Sans Coptic	1000	1069	-293	0
STIXSizeFiveSym	1000	960	-454	0
Arial	2048	1854	-434	67
Noto Sans Tifinagh	1000	1069	-293	0
Noto Sans Old Turkic	1000	1069	-293	0
STIXGeneral	1000	1055	-455	0
Noto Sans Mongolian	1000	1457	-293	0
Verdana	2048	2059	-430	0
Noto Sans Old Permic	1000	1069	-293	0
STIXIntegralsD	1000	2182	-451	0
Noto Sans Tai Tham	2048	2189	-1000	0
Noto Sans MeeteiMayek	1000	1069	-321	0
Noto Sans OldNorArab	1000	1069	-293	0
Noto Sans Osmanya	1000	1069	-293	0
Arial Narrow	2048	1916	-434	0

font_metrics.ts

// This script extracts font metadata from TTF/OTF files in a specified directory
// Example: deno run --allow-read --allow-run --allow-env font_metrics.ts FONTS_DIR

import fs from "node:fs";
import path from "node:path";
import { execSync } from "node:child_process";

const fontDir = process.argv[2];
if (fontDir.trim() === "") {
  console.error("Dir not provided");
  process.exit(-1);
}

const files = fs.readdirSync(fontDir);
const fontFiles = files.filter((f) => /\.(ttf|otf)$/i.test(f));
if (fontFiles.length === 0) {
  console.log("No font files found.");
  process.exit(0);
}

function run(cmd: string): string {
  const out = execSync(cmd, {
    shell: true,

    encoding: "utf8",
    stdio: ["ignor", "pipe", "ignore"],
  });

  return out.trim();
}

console.log("| Name | UnitsPerEm | Ascender | Descender | LineGap |");
console.log("|:-|:-|:-|:-|:-|");

for (const file of fontFiles) {
  const fullPath = path.join(fontDir, file);

  const results = [
    run(
      `ttx -q -t name -o - "${fullPath}" | dasel -r xml -w json | jq -r '.ttFont.name.namerecord | map(select(."-nameID" == "1"))[0]."#text"'`,
    ),
    run(
      `ttx -t head -q -o - "${fullPath}" | dasel -r xml '.ttFont.head.unitsPerEm.-value'`,
    ),
    run(
      `ttx -t hhea -q -o - "${fullPath}" | dasel -r xml '.ttFont.hhea.ascent.-value'`,
    ),
    run(
      `ttx -t hhea -q -o - "${fullPath}" | dasel -r xml '.ttFont.hhea.descent.-value'`,
    ),
    run(
      `ttx -t hhea -q -o - "${fullPath}" | dasel -r xml '.ttFont.hhea.lineGap.-value'`,
    ),
  ];

  console.log(`| ${results.join(" | ")} |`);
}