fisheye-correction-plus/utils/find-opencv.js

A opencv fisheye camera model bindings for Node.js

"use strict";

const exec = require("child_process").exec;
const fs = require("fs");
const flag = process.argv[2] || "--exists";

const opencv = "opencv";

function main() {
  //Try using pkg-config, but if it fails and it is on Windows, try the fallback
  exec("pkg-config " + opencv + " " + flag, function(error, stdout, stderr) {
    if (error) {
      if (process.platform === "win32") {
        fallback();
      } else {
        throw new Error("ERROR: failed to run: pkg-config", opencv, flag);
      }
    } else {
      console.log(stdout);
    }
  });
}

//======================Windows Specific=======================================

function fallback() {
  exec("echo %OPENCV_DIR%", function(error, stdout, stderr) {
    stdout = cleanupEchoOutput(stdout);
    if (error) {
      throw new Error("ERROR: There was an error reading OPENCV_DIR");
    } else if (stdout === "%OPENCV_DIR%") {
      throw new Error("ERROR: OPENCV_DIR doesn't seem to be defined");
    } else {
      printPaths(stdout);
    }
  });
}

function printPaths(opencvPath) {
  if (flag === "--cflags") {
    console.log('"' + opencvPath + '\\..\\..\\include"');
    console.log('"' + opencvPath + '\\..\\..\\include\\opencv"');
  } else if (flag === "--libs") {
    var libPath = opencvPath + "\\lib\\";

    fs.readdir(libPath, function(err, files) {
      if (err) {
        throw new Error("ERROR: couldn't read the lib directory " + err);
      }

      var libs = "";
      for (var i = 0; i < files.length; i++) {
        if (getExtension(files[i]) === "lib") {
          libs = libs + ' "' + libPath + files[i] + '" \r\n ';
        }
      }
      console.log(libs);
    });
  } else {
    throw new Error("Error: unknown argument '" + flag + "'");
  }
}

function cleanupEchoOutput(s) {
  return s.slice(0, s.length - 2);
}

function getExtension(s) {
  return s.substr(s.lastIndexOf(".") + 1);
}

main();