1 files changed, 89 insertions, 0 deletions
diff --git a/lib/template.js b/lib/template.js
new file mode 100644
index 0000000..ce05473
--- /dev/null
+++ b/lib/template.js
@@ -0,0 +1,89 @@
+function normalize(name) {
+    return name.replace('/', '-').replace('@', '').replace('.', '-');
+}
+
+function fmt(words, maxLine, glue1, glue2) {
+    var line = [];
+    var lines = []
+    var lineLength = 0;
+
+    for (var i = 0; i < words.length; i++) {
+        const itemLength = glue1.length + words[i].length
+        if (itemLength + lineLength <= maxLine || line.length === 0) {
+            line.push(words[i]);
+            lineLength += itemLength;
+        } else {
+            lines.push(line);
+            line = [words[i]];
+            lineLength = itemLength;
+        }
+    }
+
+    lines.push(line);
+
+    lines = lines.map((l) => {
+        return l.join(glue1);
+    });
+
+    return lines.join(glue2);
+}
+
+
+function render(src, pkg) {
+    const deps = pkg.dependencies || {};
+    const devDeps = pkg.devDependencies || {};
+    const npmInputs = Object.keys({...deps,
+        ...devDeps
+    }).sort().map(normalize);
+    const args = ['buildNpmPackage', ...npmInputs];
+
+    var source = '';
+
+    if ('string' === typeof src) {
+        if (!src.startsWith('/') && !src.startsWith('./') && !src.startsWith('../')) {
+            src = `./${src}`;
+        }
+        source = `  src = ${src};`;
+    } else {
+        args.unshift(src.fetch);
+        switch (src.fetch) {
+            case 'fetchurl':
+                source = `\
+  src = ${src.fetch} {
+    url = "${src.url}";
+    sha256 = "${src.sha256}";
+  };`;
+                break;
+            case 'fetchgit':
+                source = `\
+  src = ${src.fetch} {
+    url = "${src.url}";
+    rev = "${src.rev}";
+    sha256 = "${src.sha256}";
+  };`;
+                break;
+        }
+    }
+
+    return `\
+{ ${fmt(args, 90, ', ', '\n, ')} }:
+
+buildNpmPackage {
+  pname = "${pkg.name}";
+  version = "${pkg.version}";
+${source}
+
+  meta = {
+    description = "${pkg.description || ''}";
+    homepage = "${pkg.homepage || ''}";
+    license = "${pkg.license || ''}";
+  };
+
+  npmInputs = [
+    ${fmt(npmInputs, 80, ' ', '\n    ')}
+  ];
+}
+  `;
+}
+
+module.exports = render;