52 lines
1.6 KiB
JavaScript
52 lines
1.6 KiB
JavaScript
#!/usr/bin/env node
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var commander = require("commander"),
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vm = require("vm"),
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d3 = Object.assign({}, require("d3-geo"), require("../")),
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read = require("./read"),
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write = require("./write");
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commander
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.version(require("../package.json").version)
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.usage("[options] <projection> [file]")
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.description("Transform GeoJSON, such as to project from spherical to planar coordinates.")
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.option("-o, --out <file>", "output file name; defaults to “-” for stdout", "-")
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.option("-p, --precision <value>", "number of output digits after the decimal point")
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.option("-n, --newline-delimited", "use newline-delimited JSON")
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.parse(process.argv);
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if (commander.args.length < 1) {
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console.error();
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console.error(" error: missing projection");
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console.error();
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process.exit(1);
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} else if (commander.args.length > 2) {
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console.error();
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console.error(" error: multiple input files");
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console.error();
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process.exit(1);
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} else if (commander.args.length === 1) {
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commander.args.push("-");
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}
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var sandbox = {d3: d3, d: undefined, i: -1},
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context = new vm.createContext(sandbox),
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projection = new vm.Script("(" + commander.args[0] + ")"),
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reader = read(commander.args[1], commander.newlineDelimited, project).then(end).catch(abort),
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writer = write(commander.out);
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function project(d, i) {
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sandbox.d = d, sandbox.i = i;
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d = d3.geoProject(d, projection.runInContext(context));
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if (commander.precision != null) d3.geoQuantize(d, commander.precision);
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return writer.write(JSON.stringify(d) + "\n");
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}
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function end() {
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return writer.end();
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}
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function abort(error) {
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console.error(error.stack);
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}
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