diff --git a/build.bat b/build.bat
index 0b8af9c..c5274ed 100644
--- a/build.bat
+++ b/build.bat
@@ -11,15 +11,15 @@ if not "%1%"=="" (
 
 rem build all fonts
 for /d %%d in (.\ligature\*) do call :build_font %%~nd
-exit /b	
-	
+exit /b
+
 
 :build_font
 set lig=%1
 set otf=%lig:Lig=%
 
 if not exist .\original\%otf%.otf exit /b
-if not exist .\ligature\%lig%\charstrings.xml exit /b
+if not exist .\ligature\%lig%\glyphs\* exit /b
 
 @echo Building %lig%
 ttx -f .\original\%otf%.otf
diff --git a/build.sh b/build.sh
index 6f6b42c..725b31e 100755
--- a/build.sh
+++ b/build.sh
@@ -6,15 +6,15 @@ build_font() {
     lig="$1"
     otf=${lig/Lig/}
 
-    if [ ! -e "./original/$otf.otf" ] 
-    then 
-        return 
+    if [ ! -e "./original/$otf.otf" ]
+    then
+        return
     fi
-    if [ ! -e "./ligature/$lig/charstrings.xml" ] 
-    then 
-        return 
+    if [ ! -e "./ligature/$lig/glyphs" ]
+    then
+        return
     fi
-    
+
     echo Building $1
     ttx -f "./original/$otf.otf"
     node index.js $otf
diff --git a/extract.js b/extract.js
index 5ebab58..f57fb39 100644
--- a/extract.js
+++ b/extract.js
@@ -1,38 +1,45 @@
-const Promise = require('bluebird');
-const fs = Promise.promisifyAll(require('fs'));
-
+const fs = require('fs');
+const os = require('os');
+if (!os.EOL) {
+  os.EOL = process.platform === 'win32' ? '\r\n' : '\n';
+}
 const xpath = require('xpath');
 const { DOMParser, XMLSerializer } = require('xmldom');
 const format = require('xml-formatter');
+const hash = require('hash.js');
+
 let fontName;
 
-const regEx = /\.liga$/;
-const regExBlankLines = /^(?=\n)$|^\s*/gm;
-const regExWhitespace = /^\s+$/;
+const regEx = /^LIG$|\.liga$/;
 const NodeType = {};
 NodeType.TEXT_NODE = 3;
 
-async function main() {
+function main() {
   fontName = process.argv[2];
 
   const srcFileName = `./ligature_source/${fontName}.ttx`;
 
+  const folder = `./ligature/${fontName}`;
+  const fileName = `./${folder}/names.json`;
+  if (!fs.existsSync(fileName)) {
+    return 0;
+  }
+
   console.log(`Reading file ${srcFileName}`);
-  const xml = await fs.readFileAsync(srcFileName, 'utf-8');
+  const xml = fs.readFileSync(srcFileName, 'utf-8');
   const dom = new DOMParser().parseFromString(xml);
 
-  await extractAndWrite('charstrings', extractCharStrings, dom);
-  await extractAndWrite('config', extractConfig, dom);
-  await extractAndWrite('gpos', extractGpos, dom);
-  await extractAndWrite('gsub', extractGsub, dom);
-  await extractAndWrite('hmtx', extractHmtx, dom);
-  await extractAndWrite('subrs', extractSubrs, dom);
-  await extractAndWrite('gsubrs', extractGlobalSubrs, dom);
+  extractAndWrite('config', extractConfig, dom);
+
+  extractCharStrings(dom);
+
+  extractAndWrite('subrs', extractSubrs, dom);
+  extractAndWrite('gsubrs', extractGlobalSubrs, dom);
 
   console.log('Done');
 }
 
-async function extractAndWrite(name, func, dom) {
+function extractAndWrite(name, func, dom) {
   const newDom = func(dom);
   console.log('Finished extracting ' + name);
 
@@ -41,24 +48,11 @@ async function extractAndWrite(name, func, dom) {
   if (!fs.existsSync(folder)) {
     fs.mkdirSync(folder);
   }
-  await fs.writeFileAsync(fileName, format(serialize(newDom)));
+  fs.writeFileSync(fileName, format(serialize(newDom)));
   console.log('Finished writing ' + name);
 }
-
-const serialize = dom =>
-  new XMLSerializer().serializeToString(dom, false, node => {
-    if (node.nodeType === NodeType.TEXT_NODE) {
-      if (regExWhitespace.test(node.data)) return null;
-      const data = node.data
-        .split('\r\n')
-        .filter(s => /\S+/.test(s))
-        .map(s => s.replace(/^\s+/g, ''))
-        .join('\n');
-
-      return node.ownerDocument.createTextNode(data);
-    }
-    return node;
-  });
+//const dump = dom => console.log(serialize(dom));
+const serialize = dom => new XMLSerializer().serializeToString(dom);
 
 const extractConfig = dom => {
   const newDom = new DOMParser().parseFromString('<ttFont/>');
@@ -92,29 +86,7 @@ const extractFromPath = (path, dom) => {
   return newDom.documentElement;
 };
 
-const extractGpos = dom => {
-  const gpos = xpath.select('/ttFont/GPOS', dom, true);
-  return gpos;
-};
-
-const extractGsub = dom => {
-  const gsub = xpath.select('/ttFont/GSUB', dom, true);
-  return gsub;
-};
-
-const extractHmtx = dom => {
-  const newDom = new DOMParser().parseFromString('<hmtx/>');
-  const mtx = xpath.select('/ttFont/hmtx/mtx', dom);
-
-  mtx
-    .filter(node => regEx.test(node.getAttribute('name')))
-    .forEach(node => newDom.documentElement.appendChild(node));
-
-  return newDom;
-};
-
 const extractCharStrings = dom => {
-  const newDom = new DOMParser().parseFromString('<CharStrings/>');
   const charStrings = xpath.select(
     '/ttFont/CFF/CFFFont/CharStrings/CharString',
     dom
@@ -122,9 +94,118 @@ const extractCharStrings = dom => {
 
   charStrings
     .filter(node => regEx.test(node.getAttribute('name')))
-    .forEach(node => newDom.documentElement.appendChild(node));
+    .forEach(node => writeGlyphData(dom, node));
+  console.log('Finished writing charstrings');
+};
 
-  return newDom;
+const writeGlyphData = (dom, node) => {
+  const newDom = new DOMParser().parseFromString('<Glyph/>').documentElement;
+  const name = node.getAttribute('name');
+  newDom.setAttribute('name', name);
+
+  // get mtx
+  const mtx = xpath.select(`/ttFont/hmtx/mtx[@name="${name}"]`, dom, true);
+  newDom.setAttribute('lsb', mtx.getAttribute('lsb'));
+  newDom.setAttribute('width', mtx.getAttribute('width'));
+
+  const charStringDom = dom.createElement('CharString');
+
+  const subrsDom = dom.createElement('Subrs');
+  const gsubrsDom = dom.createElement('GlobalSubrs');
+  newDom.appendChild(charStringDom);
+  newDom.appendChild(subrsDom);
+  newDom.appendChild(gsubrsDom);
+
+  const subrs = {
+    map: [],
+    fingerprints: [],
+    sourcePath: '/ttFont/CFF/CFFFont/Private/Subrs',
+    target: subrsDom
+  };
+  const gsubrs = {
+    map: [],
+    fingerprints: [],
+    sourcePath: '/ttFont/CFF/GlobalSubrs',
+    target: gsubrsDom
+  };
+
+  extractCharStringSubrs(dom, node, subrs, gsubrs, 8);
+
+  const outline = indentTextContent(node.childNodes[0].textContent, 8);
+  charStringDom.appendChild(dom.createTextNode(outline));
+
+  const folder = `./ligature/${fontName}/glyphs`;
+  const fileName = `./${folder}/${name}.xml`;
+  if (!fs.existsSync(folder)) {
+    fs.mkdirSync(folder);
+  }
+  fs.writeFileSync(fileName, format(serialize(newDom)));
+  console.log('* ' + name);
+};
+
+const extractCharStringSubrs = (dom, node, subrs, gsubrs, indent) => {
+  // check for callsubr/callgsubr
+
+  const lines = node.childNodes[0].textContent.split(os.EOL);
+  const newLines = [];
+  let fingerprint = '';
+
+  lines.forEach(line => {
+    if (line.trim().length === 0) return;
+    const matches = line.match(/(.*?)(-?\d+) (callsubr|callgsubr)$/);
+    if (matches != null) {
+      const { map, fingerprints, sourcePath, target } =
+        matches[3] === 'callsubr' ? subrs : gsubrs;
+      const index = matches[2];
+      const srcIndex = parseInt(index) + 107;
+      let newIndex = map[srcIndex];
+
+      if (!newIndex) {
+        // find subr in source dom and copy to target dom
+        const srcSubr = xpath.select(
+          `/${sourcePath}/CharString[@index="${srcIndex}"]`,
+          dom,
+          true
+        );
+
+        // append subr to target dom and get new index
+        newIndex = xpath.select('count(CharString)', target, true);
+        map[srcIndex] = newIndex;
+
+        const clone = srcSubr.cloneNode(true);
+        clone.setAttribute('index', newIndex);
+        target.appendChild(clone);
+
+        // patch up source in case it also has any callsubrs
+        fingerprint = extractCharStringSubrs(dom, clone, subrs, gsubrs, 12);
+        fingerprints[newIndex] = fingerprint;
+      } else {
+        fingerprint = fingerprints[newIndex];
+      }
+
+      // rewrite line with fingerprint
+      line = `${matches[1]}{${fingerprint}} ${matches[3]}`;
+    }
+    newLines.push(line.trim());
+  });
+  const content = newLines.join('\n');
+  fingerprint = hash
+    .sha256()
+    .update(content)
+    .digest('hex')
+    .substr(0, 8);
+  node.setAttribute('fingerprint', fingerprint);
+
+  node.childNodes[0].textContent = indentTextContent(content, indent);
+  return fingerprint;
+};
+
+const indentTextContent = (text, indent) => {
+  return text
+    .split('\n')
+    .map(line => ' '.repeat(indent) + line.trim())
+    .join('\n')
+    .trim();
 };
 
 const extractSubrs = dom => {
diff --git a/extract.sh b/extract.sh
index 88f4b51..798ec0c 100755
--- a/extract.sh
+++ b/extract.sh
@@ -15,6 +15,6 @@ then
 else
     # build all available fonts
     for f in ./ligature_source/*.otf ; do
-        extract_font $(basename $f)
+        extract_font `basename "${f%.*}"`
     done
 fi
diff --git a/gsub.js b/gsub.js
new file mode 100644
index 0000000..d8a0c78
--- /dev/null
+++ b/gsub.js
@@ -0,0 +1,264 @@
+const xpath = require('xpath');
+//const { XMLSerializer } = require('xmldom');
+//const format = require('xml-formatter');
+const NodeType = {};
+NodeType.TEXT_NODE = 3;
+
+let dom;
+let gsubDom;
+let scriptListDom;
+let featureListDom;
+let lookupListDom;
+let featureDom;
+let lookupIndex = 0;
+let chainIndex = 0;
+const substLookupMap = {};
+
+const buildGsubTables = (_dom, ligature) => {
+  const glyphs = ligature.name.split('_');
+
+  dom = _dom;
+  gsubDom = xpath.select('ttFont/GSUB', dom, true);
+
+  // look for 'calt' feature
+  featureListDom = xpath.select('FeatureList', gsubDom, true);
+
+  let featureRecord;
+  const featureTag = xpath.select(
+    'FeatureRecord/FeatureTag[@value="calt"]',
+    featureListDom,
+    true
+  );
+  if (!featureTag) {
+    const featureListCount = xpath.select(
+      'count(FeatureRecord)',
+      featureListDom,
+      true
+    );
+    featureRecord = createElementWithAttributes('FeatureRecord', {
+      index: featureListCount
+    });
+    featureRecord.appendChild(
+      createElementWithAttributes('FeatureTag', { value: 'calt' })
+    );
+    featureRecord.appendChild(dom.createElement('Feature'));
+    featureListDom.appendChild(featureRecord);
+  } else {
+    featureRecord = featureTag.parentNode;
+  }
+  featureDom = xpath.select('Feature', featureRecord, true);
+
+  const featureIndex = featureRecord.getAttribute('index');
+
+  // add feature to scriptlist for DFLT and latn if not present
+  addFeatureToScriptList('DFLT', featureIndex);
+  addFeatureToScriptList('latn', featureIndex);
+
+  lookupListDom = xpath.select('LookupList', gsubDom, true);
+  lookupIndex = xpath.select('count(Lookup)', lookupListDom, true);
+
+  const lookupDom = createElementWithAttributes('Lookup', {
+    index: lookupIndex++
+  });
+  appendChildren(
+    lookupDom,
+    createElementWithAttributes('LookupType', { value: 6 }),
+    createElementWithAttributes('LookupFlag', { value: 0 })
+  );
+
+  lookupListDom.appendChild(lookupDom);
+
+  // add contextual lookup to feature
+  const featureLookupCount = xpath.select(
+    'count(LookupListIndex)',
+    featureDom,
+    true
+  );
+  featureDom.appendChild(
+    createElementWithAttributes('LookupListIndex', {
+      index: featureLookupCount,
+      value: lookupDom.getAttribute('index')
+    })
+  );
+
+  lookupDom.appendChild(buildBacktrackFirst(glyphs));
+  lookupDom.appendChild(buildLookAheadLast(glyphs));
+  lookupDom.appendChild(buildLigatureSubst(glyphs, ligature.glyph));
+  // remaining context
+  for (let n = glyphs.length - 2; n >= 0; n--) {
+    lookupDom.appendChild(
+      buildChainContext(getLIGs(n), [glyphs[n]], glyphs.slice(n + 1), 'LIG')
+    );
+  }
+};
+
+const finalizeGsubTables = () => {
+  // get current LookupList count
+  let newIndex = xpath.select('count(Lookup)', lookupListDom, true);
+
+  // append added lookups
+  Object.entries(substLookupMap).forEach(lookupEntry => {
+    // fixup existing lookups with new index
+    const lookup = lookupEntry[1];
+    const oldIndex = lookup.getAttribute('index');
+    const substLookups = xpath.select(
+      `//ChainContextSubst/SubstLookupRecord/LookupListIndex[@value="${oldIndex}"]`,
+      lookupListDom,
+      false
+    );
+    substLookups.forEach(substLookup => {
+      substLookup.setAttribute('value', newIndex);
+    });
+    lookup.setAttribute('index', newIndex++);
+    lookupListDom.appendChild(lookup);
+    lookupListDom.appendChild(lookup);
+  });
+};
+
+//const dump = dom => console.log(format(serialize(dom)));
+
+const addFeatureToScriptList = (tag, featureIndex) => {
+  scriptListDom = xpath.select('ScriptList', gsubDom, true);
+  const defaultLangSys = xpath.select(
+    `ScriptRecord/ScriptTag[@value="${tag}"]/../Script/DefaultLangSys`,
+    scriptListDom,
+    true
+  );
+  const featureIndexNode = xpath.select(
+    `FeatureIndex[@value=${featureIndex}]`,
+    defaultLangSys,
+    true
+  );
+  if (!featureIndexNode) {
+    const count = xpath.select('count(FeatureIndex)', defaultLangSys, true);
+    defaultLangSys.appendChild(
+      createElementWithAttributes('FeatureIndex', {
+        index: count,
+        value: featureIndex
+      })
+    );
+  }
+};
+
+const buildBacktrackFirst = glyphs => {
+  // backtrack = first glyph
+  // input = first glphy
+  // lookAhead = [1..n]
+  return buildChainContext([glyphs[0]], [glyphs[0]], glyphs.slice(1));
+};
+
+const buildLookAheadLast = glyphs => {
+  // backtrack = none
+  // input = first glyph
+  // lookAhead = [1..n] + [n]
+  return buildChainContext(
+    [],
+    [glyphs[0]],
+    [...glyphs.slice(1), glyphs.slice(-1)]
+  );
+};
+
+const buildLigatureSubst = (glyphs, lookup) => {
+  // backtrack = LIG * n-1
+  // input = last glyph
+  // lookAhead = none
+  return buildChainContext(
+    getLIGs(glyphs.length - 1),
+    glyphs.slice(-1),
+    [],
+    lookup
+  );
+};
+
+const getLIGs = length => new Array(length).fill('LIG', 0, length);
+
+const buildChainContext = (backtrack, input, lookAhead, substitute) => {
+  const chainDom = createElementWithAttributes('ChainContextSubst', {
+    index: chainIndex++,
+    Format: 3
+  });
+
+  buildCoverage(chainDom, 'BacktrackCoverage', backtrack);
+  buildCoverage(chainDom, 'InputCoverage', input);
+  buildCoverage(chainDom, 'LookAheadCoverage', lookAhead);
+
+  if (substitute) {
+    const lookup = getSubstLookup(input[0], substitute);
+    const listIndex = lookup.getAttribute('index');
+    const substLookupRecordDom = chainDom.appendChild(
+      createElementWithAttributes('SubstLookupRecord', { index: 0 })
+    );
+    appendChildren(
+      substLookupRecordDom,
+      createElementWithAttributes('SequenceIndex', { value: 0 }),
+      createElementWithAttributes('LookupListIndex', { value: listIndex })
+    );
+  }
+  return chainDom;
+};
+
+const buildCoverage = (chainDom, tagName, coverage) => {
+  if (coverage) {
+    coverage.forEach((glyph, i) => {
+      const coverageDom = createElementWithAttributes(tagName, {
+        index: i++,
+        Format: 1
+      });
+      coverageDom.appendChild(
+        createElementWithAttributes('Glyph', { value: glyph })
+      );
+      chainDom.appendChild(coverageDom);
+    });
+  }
+};
+
+const getSubstLookup = (input, output) => {
+  let lookupDom = substLookupMap[output];
+
+  if (!lookupDom) {
+    lookupDom = createElementWithAttributes('Lookup', {
+      index: Object.keys(substLookupMap).length + 1
+    });
+    lookupDom.appendChild(
+      createElementWithAttributes('LookupType', { value: 1 })
+    );
+    lookupDom.appendChild(
+      createElementWithAttributes('LookupFlag', { value: 0 })
+    );
+    lookupDom.appendChild(
+      createElementWithAttributes('SingleSubst', { index: 0, Format: 2 })
+    );
+    substLookupMap[output] = lookupDom;
+  }
+  const singleSubstDom = xpath.select('SingleSubst', lookupDom, true);
+
+  // look for input subst
+  const substitionDom = xpath.select(
+    `Substitution[@in="${input}"]`,
+    singleSubstDom,
+    true
+  );
+  if (!substitionDom) {
+    singleSubstDom.appendChild(
+      createElementWithAttributes('Substitution', { in: input, out: output })
+    );
+  }
+  return lookupDom;
+};
+
+const createElementWithAttributes = (tagName, attributes) => {
+  const element = dom.createElement(tagName);
+  Object.entries(attributes).forEach(attribute => {
+    element.setAttribute(attribute[0], attribute[1]);
+  });
+  return element;
+};
+
+const appendChildren = (node, ...children) => {
+  children.forEach(child => node.appendChild(child));
+};
+
+//const serialize = dom => new XMLSerializer().serializeToString(dom);
+
+exports.buildGsubTables = buildGsubTables;
+exports.finalizeGsubTables = finalizeGsubTables;
diff --git a/index.js b/index.js
index 56d70c6..78d3a9f 100644
--- a/index.js
+++ b/index.js
@@ -1,76 +1,193 @@
-const Promise = require('bluebird');
-const fs = Promise.promisifyAll(require('fs'));
+const fs = require('fs');
 const os = require('os');
 if (!os.EOL) {
   os.EOL = process.platform === 'win32' ? '\r\n' : '\n';
 }
 
+const gsub = require('./gsub');
+
 const xpath = require('xpath');
 const { DOMParser, XMLSerializer } = require('xmldom');
 const format = require('xml-formatter');
 let fontName;
 let ligFontName;
 
-const regEx = /\.liga$/;
-const regExBlankLines = /^(?=\n)$|^\s*/gm;
 const regExWhitespace = /^\s+$/;
 const NodeType = {};
 NodeType.TEXT_NODE = 3;
 
-async function main() {
+let dom;
+function main() {
   fontName = process.argv[2];
   ligFontName = fontName.split('-').join('Lig-');
 
   const srcFileName = `./original/${fontName}.ttx`;
-  const dstFileName = `./build/${ligFontName}.ttx`;
   console.log(`Reading original font file ${srcFileName}`);
-  const xml = await fs.readFileAsync(srcFileName, 'utf-8');
-  const dom = new DOMParser().parseFromString(xml);
+  const xml = fs.readFileSync(srcFileName, 'utf-8');
+  dom = new DOMParser().parseFromString(xml);
 
-  try {
-    await processPatch('names', patchNames, dom);
-    await processPatch('glyphs', patchGlyphs, dom);
-    await processPatch('gpos', patchGpos, dom);
-    await processPatch('gsub', patchGsub, dom);
-    await processPatch('hmtx', patchHmtx, dom);
-    //await processPatch('lookup', patchLookup, dom);
-    await processPatch('charstrings', patchCharStrings, dom);
-  } catch (err) {
-    console.log(err);
-  }
+  const profiles = getProfiles();
+
+  // process settings (there may be more than one font to build)
+  profiles.forEach(profile => buildFont(profile));
 
-  console.log(`Writing ligature font file ${dstFileName}`);
-  await fs.writeFileAsync(dstFileName, format(serialize(dom)));
   console.log('Done');
 }
 
-async function loadConfigAsync(name) {
+const buildFont = profile => {
+  // add suffix to dstFileName if present
+  const dstFileName = `./build/${ligFontName}${
+    profile.suffixWithLeadingHyphen
+  }.ttx`;
+  console.log(
+    `Building ligature font file ${dstFileName} name = ${profile.name}`
+  );
+
+  const ligatures = sortLigatures(
+    fs
+      .readdirSync(`./ligature/${ligFontName}/glyphs`)
+      .filter(file => file != 'LIG.xml')
+      .map(file => file.replace('.liga.xml', ''))
+  )
+    .filter(name => !/\d+$/.test(name)) // skip alternates (ends with .#)
+    .filter(name => filterLigatures(name, profile.ligatures))
+    .map(name => mapLigatures(name, profile.ligatures));
+
+  const ligaturesWithLIG = [...ligatures, { name: 'LIG', glyph: 'LIG' }];
+
+  processPatch('names', patchNames, dom, ligatures, profile);
+  processPatch('glyphs', patchGlyphs, dom, ligaturesWithLIG);
+  processPatch('gsub', patchGsub, dom, ligatures);
+  processPatch('charstrings', patchCharStrings, dom, ligaturesWithLIG);
+  processPatch('hmtx', patchHmtx, dom);
+
+  console.log(`Writing ligature font file ${dstFileName}`);
+  fs.writeFileSync(dstFileName, format(serialize(dom)));
+};
+
+const getProfiles = () => {
+  const profilePath = './original/profiles.ini';
+  // return default profiles if profile doesn't exist
+  if (!fs.existsSync(profilePath)) {
+    return [
+      {
+        name: 'default',
+        suffix: '',
+        suffixWithLeadingSpace: '',
+        suffixWithLeadingHyphen: '',
+        ligatures: []
+      }
+    ];
+  }
+
+  const profiles = [];
+  let profile = null;
+
+  const content = fs.readFileSync(profilePath, 'utf-8');
+  content
+    .split(os.EOL)
+    .filter(line => /^#/.test(line) === false || line.length > 0)
+    .forEach(line => {
+      const ch = line.trim()[0];
+      if (ch === '[') {
+        let name = line.substr(1, line.indexOf(']') - 1);
+        profile = {
+          name,
+          suffix: name === 'default' ? '' : name,
+          suffixWithLeadingSpace: name === 'default' ? '' : ' ' + name,
+          suffixWithLeadingHyphen: name === 'default' ? '' : '-' + name,
+          ligatures: []
+        };
+        profiles.push(profile);
+      } else {
+        if (!profile) {
+          throw new Error('You must profile a profile name in []');
+        }
+        profile.ligatures.push(line);
+      }
+    });
+
+  return profiles;
+};
+
+const filterLigatures = (name, ligatures) => {
+  // loop through ligatures and return if name applies or not
+  // skip if setting is !name
+  return ligatures.filter(ligature => ligature === '!' + name).length === 0;
+};
+
+const mapLigatures = (name, ligatures) => {
+  // return { ligature, glyph }
+  let entry = { name, glyph: name + '.liga' };
+  ligatures.forEach(ligature => {
+    const n = ligature.indexOf('=');
+    if (n > 0 && ligature.substr(0, n) === name) {
+      entry.glyph = ligature.substr(n + 1);
+    }
+  });
+  return entry;
+};
+
+const sortLigatures = ligatures => {
+  // sort by most glyphs then alphabetically
+  const sorted = ligatures
+    .map(ligature => {
+      return { count: ligature.split('_').length + 1, ligature: ligature };
+    })
+    .sort(
+      (a, b) =>
+        -compareProperty(a.count, b.count) || // sort by count descending
+        compareProperty(a.ligature, b.ligature) // then by ligature alphabetically
+    )
+    .map(entry => entry.ligature);
+  return sorted;
+};
+
+const compareProperty = (a, b) => {
+  if (typeof a === 'number') {
+    return a || b ? (!a ? -1 : !b ? 1 : a === b ? 0 : a < b ? -1 : 1) : 0;
+  } else {
+    return a || b ? (!a ? -1 : !b ? 1 : a.localeCompare(b)) : 0;
+  }
+};
+
+const loadXml = name => {
   const fileName = `./ligature/${ligFontName}/${name}.xml`;
-  const xml = await fs.readFileAsync(fileName, 'utf-8');
+  const xml = fs.readFileSync(fileName, 'utf-8');
   return new DOMParser().parseFromString(xml);
-}
+};
 
-async function processPatch(name, patchFunc, dom) {
+const processPatch = (name, patchFunc, dom, ligatures, profile) => {
   console.log(`Patching ${name}`);
-  await patchFunc(dom);
-}
+  patchFunc(dom, ligatures, profile);
+};
 
-async function patchNames(dom) {
-  const configDom = await loadConfigAsync('names');
+const PlatformId = {
+  mac: 1,
+  win: 3
+};
 
-  const names = xpath.select('/name/namerecord', configDom);
-  const targetName = xpath.select('/ttFont/name', dom, true);
+const NameId = {
+  familyName: 1,
+  fontStyle: 2,
+  uniqueId: 3,
+  fullName: 4,
+  version: 5,
+  postscriptName: 6,
+  windowsFamilyName: 16,
+  fontStyleName: 17
+};
 
-  // get font and family name
-  const familyName = getTextNode(
-    configDom,
-    '/name/namerecord[@nameID="1" and @platformID="1"]'
-  );
-  const fullName = getTextNode(
-    configDom,
-    '/name/namerecord[@nameID="4" and @platformID="1"]'
+const patchNames = (dom, ligatures, profile) => {
+  const names = JSON.parse(
+    fs.readFileSync(`./ligature/${ligFontName}/names.json`)
   );
 
+  const [name, style] = names.fontName.split('-');
+  const fontName = `${name}${profile.suffixWithLeadingHyphen}-${style}`;
+  const familyName = `${names.familyName}${profile.suffixWithLeadingSpace}`;
+  const fullName = `${familyName} ${names.fontStyle}`;
+  const uniqueId = `${names.foundry}: ${fullName}: ${names.version}`;
   // patch CFFFont
   const cffFont = xpath.select('/ttFont/CFF/CFFFont', dom, true);
 
@@ -79,93 +196,65 @@ async function patchNames(dom) {
   setAttribute(cffFont, 'FamilyName', 'value', familyName);
 
   // update existing names with new names
-  names.forEach(node => {
-    const nameId = node.getAttribute('nameID');
-    const platformId = node.getAttribute('platformID');
+  updateName(PlatformId.mac, NameId.familyName, familyName);
+  updateName(PlatformId.mac, NameId.fontStyle, names.fontStyle);
+  updateName(PlatformId.mac, NameId.uniqueId, uniqueId);
+  updateName(PlatformId.mac, NameId.fullName, fullName);
+  updateName(PlatformId.mac, NameId.postscriptName, fontName);
+  updateName(PlatformId.mac, NameId.windowsFamilyName, familyName);
+  updateName(PlatformId.mac, NameId.fontStyleName, names.fontStyle);
 
-    // search for namerecord in target dom and replace with this one or append node
-    const target = xpath.select(
-      `/ttFont/name/namerecord[@nameID="${nameId}" and @platformID="${platformId}"]`,
-      dom,
-      true
-    );
-    if (target) {
-      target.parentNode.replaceChild(node, target);
-    } else {
-      targetName.appendChild(node);
-    }
-  });
-}
+  updateName(PlatformId.win, NameId.familyName, familyName);
+  updateName(PlatformId.win, NameId.fontStyle, names.windowsFontStyle);
+  updateName(PlatformId.win, NameId.uniqueId, uniqueId);
+  updateName(PlatformId.win, NameId.fullName, fullName);
+  updateName(PlatformId.win, NameId.postscriptName, fontName);
+  updateName(PlatformId.win, NameId.windowsFamilyName, familyName);
+  updateName(PlatformId.win, NameId.fontStyleName, names.fontStyle);
+};
 
-async function patchGlyphs(dom) {
-  const configDom = await loadConfigAsync('../glyphs');
+const updateName = (platformId, nameId, value) => {
+  // search for namerecord in target dom and replace with this one or append node
+  const target = xpath.select(
+    `/ttFont/name/namerecord[@nameID="${nameId}" and @platformID="${platformId}"]`,
+    dom,
+    true
+  );
+  if (target) {
+    target.childNodes[0].textContent = value;
+  }
+};
+
+const patchGlyphs = (dom, ligatures) => {
   // get number of glyphs in target dom
   const targetGlyphs = xpath.select('/ttFont/GlyphOrder', dom, true);
   const glyphsCount = xpath.select('count(GlyphID)', targetGlyphs, true);
 
+  // only import glyphs specified
   let n = glyphsCount;
   // get ligature glyphs
-  const glyphs = xpath.select('/GlyphOrder/GlyphID', configDom);
-  glyphs.forEach(node => {
-    node.setAttribute('id', n++);
-    targetGlyphs.appendChild(node);
+  ligatures.forEach(ligature => {
+    targetGlyphs.appendChild(
+      createElementWithAttributes('GlyphID', { id: n++, name: ligature.glyph })
+    );
   });
-
   // update glyph count
   setAttribute(dom, '/ttFont/maxp/numGlyphs', 'value', n);
-}
-
-async function patchGpos(dom) {
-  const newGpos = await loadConfigAsync('gpos');
-  const oldGpos = xpath.select('/ttFont/GPOS', dom, true);
-  dom.documentElement.replaceChild(newGpos, oldGpos);
-}
-
-async function patchGsub(dom) {
-  const newGsub = await loadConfigAsync('gsub');
-
-  // loop through Substituion/Ligature nodes and remap chars
-  remap(newGsub, dom, '//Substitution', 'out');
-  remap(newGsub, dom, '//Ligature', 'glyph');
-
-  const oldGsub = xpath.select('/ttFont/GSUB', dom, true);
-  dom.documentElement.replaceChild(newGsub, oldGsub);
-}
-
-const remap = (patchDom, cmapDom, path, attr) => {
-  const cmap = [];
-  let nodes = xpath.select(path, patchDom);
-  nodes.forEach(n => {
-    const out = n.getAttribute(attr);
-    if (out.startsWith('uni')) {
-      // get cmap entry
-      const code = '0x' + out.replace(/uni0*/g, '').toLowerCase();
-      let name = cmap[code];
-      if (!name) {
-        const map = xpath.select(
-          `/ttFont/cmap/cmap_format_4/map[@code="${code}"]`,
-          cmapDom,
-          true
-        );
-        name = map == null ? out : map.getAttribute('name');
-        cmap[code] = name;
-      }
-      n.setAttribute(attr, name);
-    }
-  });
 };
 
-async function patchHmtx(dom) {
-  const hmtxDom = await loadConfigAsync('hmtx');
-  const targetHmtx = xpath.select('/ttFont/hmtx', dom, true);
-
-  const mtx = xpath.select('/hmtx/mtx', hmtxDom);
-  mtx.forEach(node => targetHmtx.appendChild(node));
+const patchGsub = (dom, ligatures) => {
+  ligatures.forEach(ligature => {
+    // build gsub tables
+    gsub.buildGsubTables(dom, ligature);
+  });
+  gsub.finalizeGsubTables();
+};
 
+const patchHmtx = dom => {
   const mtxCount = xpath.select('count(/ttFont/hmtx/mtx)', dom, true);
   setAttribute(dom, '/ttFont/hhea/numberOfHMetrics', 'value', mtxCount);
 
-  const configDom = await loadConfigAsync('config');
+  const configDom = loadXml('config');
   copyConfigAttribute(dom, configDom, '/ttFont/head/xMin', 'value');
   copyConfigAttribute(dom, configDom, '/ttFont/head/yMin', 'value');
   copyConfigAttribute(dom, configDom, '/ttFont/head/xMax', 'value');
@@ -179,159 +268,95 @@ async function patchHmtx(dom) {
     '/ttFont/CFF/CFFFont/Private/nominalWidthX',
     'value'
   );
-}
-
-async function patchLookup(dom) {
-  const configDom = await loadConfigAsync('../lookup');
-  const featureList = xpath.select('/ttFont/GSUB/FeatureList', dom, true);
-
-  const featuresCount = xpath.select(
-    'count(/ttFont/GSUB/FeatureList/FeatureRecord)',
-    dom,
-    true
-  );
-  const featureRecord = dom.createElement('FeatureRecord');
-  featureRecord.setAttribute('index', featuresCount);
-  const featureTag = dom.createElement('FeatureTag');
-  featureTag.setAttribute('value', 'liga');
-  const feature = dom.createElement('Feature');
-  featureRecord.appendChild(featureTag);
-  featureRecord.appendChild(feature);
-  featureList.appendChild(featureRecord);
-
-  const lookupCount = xpath.select(
-    'count(/ttFont/GSUB/LookupList/Lookup)',
-    dom,
-    true
-  );
-  const lookupListIndex = dom.createElement('LookupListIndex');
-  lookupListIndex.setAttribute('index', '0');
-  lookupListIndex.setAttribute('value', lookupCount);
-  feature.appendChild(lookupListIndex);
-
-  // helper function for adding feature to ScriptRecord
-  const addFeature = (scriptRecord, featureRecord, lang) => {
-    if (!lang) return;
-    const index = featureRecord.getAttribute('index');
-    if (xpath.select(`FeatureIndex[@value="${index}"]`, lang, true)) return;
-
-    const count = xpath.select('count(FeatureIndex)', lang, true);
-    const featureIndex = dom.createElement('FeatureIndex');
-    featureIndex.setAttribute('index', count);
-    featureIndex.setAttribute('value', index);
-    lang.appendChild(featureIndex);
-  };
-
-  // nead to add feature to ScriptList
-  const scriptList = xpath.select('/ttFont/GSUB/ScriptList', dom, true);
-  const scriptRecords = xpath.select('ScriptRecord', scriptList);
-  scriptRecords.forEach(node => {
-    // check for feature in DefaultLangSys
-    addFeature(
-      node,
-      featureRecord,
-      xpath.select('Script/DefaultLangSys', node, true)
-    );
-    // add features to any other languages
-    xpath
-      .select('Script/LangSysRecord/LangSys', node)
-      .forEach(lang => addFeature(node, featureRecord, lang));
-  });
-
-  // finally add LigatureSubst to Lookup
-  const lookupList = xpath.select('/ttFont/GSUB/LookupList', dom, true);
-  const newLookup = xpath.select('/LookupList/Lookup', configDom, true);
-  newLookup.setAttribute('index', lookupCount);
-  lookupList.appendChild(newLookup);
-}
-
-async function patchCharStrings(dom) {
-  const configDom = await loadConfigAsync('charstrings');
-  const nameDom = await loadConfigAsync('names');
-
-  // get font and family name
-  const familyName = getTextNode(
-    nameDom,
-    '/name/namerecord[@nameID="1" and @platformID="1"]'
-  );
-  const fullName = getTextNode(
-    nameDom,
-    '/name/namerecord[@nameID="4" and @platformID="1"]'
-  );
+};
 
+const patchCharStrings = (dom, ligatures) => {
   // patch CFFFont
   const cffFont = xpath.select('/ttFont/CFF/CFFFont', dom, true);
+  const targetHmtx = xpath.select('/ttFont/hmtx', dom, true);
 
-  cffFont.setAttribute('name', ligFontName);
-  setAttribute(cffFont, 'FullName', 'value', fullName);
-  setAttribute(cffFont, 'FamilyName', 'value', familyName);
-
-  const charStrings = xpath.select('/CharStrings/CharString', configDom);
   const targetCharStrings = xpath.select('CharStrings', cffFont, true);
+  const targetSubrs = xpath.select(
+    '/ttFont/CFF/CFFFont/Private/Subrs',
+    dom,
+    true
+  );
+  const targetGsubrs = xpath.select('/ttFont/CFF/GlobalSubrs', dom, true);
+  const fingerprints = {};
+  ligatures.forEach(ligature => {
+    console.log(
+      `* ${ligature.name}${
+        ligature.name + '.liga' === ligature.glyph || ligature.name === 'LIG'
+          ? ''
+          : ' => ' + ligature.glyph
+      }`
+    );
+    const glyphDom = loadXml(`glyphs/${ligature.glyph}`).documentElement;
+    const node = xpath.select('/Glyph/CharString', glyphDom, true);
+    node.setAttribute('name', ligature.glyph);
 
-  const subrs = {
-    map: [],
-    source: await loadConfigAsync('subrs'),
-    target: xpath.select('/ttFont/CFF/CFFFont/Private/Subrs', dom, true)
-  };
-  const gsubrs = {
-    map: [],
-    source: await loadConfigAsync('gsubrs'),
-    target: xpath.select('/ttFont/CFF/GlobalSubrs', dom, true)
-  };
+    const subrs = {
+      sourcePath: '/Glyph/Subrs',
+      target: targetSubrs
+    };
+    const gsubrs = {
+      sourcePath: '/Glyph/GlobalSubrs',
+      target: targetGsubrs
+    };
+
+    patchCharStringSubrs(glyphDom, node, fingerprints, subrs, gsubrs);
 
-  charStrings.forEach(node => {
-    patchCharStringSubrs(node, subrs, gsubrs);
     targetCharStrings.appendChild(node);
+    targetHmtx.appendChild(
+      createElementWithAttributes('mtx', {
+        name: ligature.glyph,
+        width: glyphDom.getAttribute('width'),
+        lsb: glyphDom.getAttribute('lsb')
+      })
+    );
   });
-}
+};
 
-const patchCharStringSubrs = (node, subrs, gsubrs) => {
+const patchCharStringSubrs = (glyphDom, node, fingerprints, subrs, gsubrs) => {
   // check for callsubr/callgsubr
 
   const lines = node.childNodes[0].textContent.split(/\r|\r\n|\n/g);
   const newLines = [];
-  let patched = false;
   lines.forEach(line => {
-    const matches = line.match(/(.*?)(-?\d+) (callsubr|callgsubr)$/);
+    if (line.trim().length === 0) return;
+    const matches = line.match(/(.*?)\{([0-9a-z]+)\} (callsubr|callgsubr)$/);
     if (matches != null) {
-      const { map, source, target } =
-        matches[3] === 'callsubr' ? subrs : gsubrs;
-      const index = matches[2];
-      let newIndex = 0;
-      if (!map[index]) {
-        // find subr in source dom and copy to target dom
-        const srcIndex = parseInt(index) + 107;
+      const { sourcePath, target } = matches[3] === 'callsubr' ? subrs : gsubrs;
+      const fingerprint = matches[2];
+      let newIndex = fingerprints[fingerprint];
+      if (!newIndex) {
         const srcSubr = xpath.select(
-          `//CharString[@index="${srcIndex}"]`,
-          source,
+          `/${sourcePath}/CharString[@fingerprint="${fingerprint}"]`,
+          glyphDom,
           true
         );
 
-        // patch up source in case it also has any callsubrs
-        patchCharStringSubrs(srcSubr, subrs, gsubrs);
-
         // append subr to target dom and get new index
         newIndex = xpath.select('count(CharString)', target, true);
-        srcSubr.setAttribute('index', newIndex);
-        target.appendChild(srcSubr);
+
+        const clone = srcSubr.cloneNode(true);
+        clone.setAttribute('index', newIndex);
+        target.appendChild(clone);
 
         // add new index to map and rewrite call
         newIndex = newIndex - 107;
-        map[index] = newIndex;
-      } else {
-        newIndex = map[index];
+        fingerprints[fingerprint] = newIndex;
+
+        // patch up source in case it also has any callsubrs
+        patchCharStringSubrs(glyphDom, clone, fingerprints, subrs, gsubrs);
       }
 
       // rewrite line with new subr index
       line = `${matches[1]}${newIndex} ${matches[3]}`;
-      patched = true;
     }
     newLines.push(line);
   });
-  if (patched) {
-    node.childNodes[0].textContent = newLines.join(os.EOL);
-  }
+  node.childNodes[0].textContent = newLines.join(os.EOL);
 };
 
 const setAttribute = (parent, path, name, value) => {
@@ -344,13 +369,15 @@ const copyConfigAttribute = (dom, configDom, path, name) => {
   setAttribute(dom, path, name, value);
 };
 
-const getTextNode = (dom, path) => {
-  var node = xpath.select(path, dom, true);
-  return node && node.childNodes.length
-    ? node.childNodes[0].nodeValue.trim()
-    : '';
+const createElementWithAttributes = (tagName, attributes) => {
+  const element = dom.createElement(tagName);
+  Object.entries(attributes).forEach(attribute => {
+    element.setAttribute(attribute[0], attribute[1]);
+  });
+  return element;
 };
 
+//const dump = dom => console.log(serialize(dom));
 const serialize = dom =>
   new XMLSerializer().serializeToString(dom, false, node => {
     if (node.nodeType === NodeType.TEXT_NODE) {