show.m

function show(obj,im)
host = 'http://localhost';
base_port = 3000;

imD = obj.imageData;
if isfield(imD,'imageData')
    imD=imD.imageData;
end
fignum = obj.figNumber;

if ( fignum <= 0 )
    warning('Figure number must be positive!');
    return;
end

if isstr(im)
    flist=dir(im);
    if isempty(flist)
        fprintf(2,'leversc.show :: could not find LEVER file %s\n',im);
        return;
    end
    im=fullfile(flist(1).folder,flist(1).name);
    im=strrep(im,'*','/');
end

port = base_port + fignum;
chksrv = obj.check_server(host);
if ( isempty(chksrv) )
    leverpath = '';
    if ( ~isempty(which('ljsPath')) )
        leverpath = ljsPath();
    end
    
    if isstr(im)
        launch_electron(port,fignum,fullfile(pwd(),'.lever'), leverpath,im);
        return
    else
        launch_electron(port,fignum,fullfile(pwd(),'.lever'), leverpath,[]);
    end
    % Poll for app for 5 seconds
    for i=1:10
        if ( ~isempty(obj.check_server(host)) )
            break;
        end
        pause(0.5);
    end
elseif isstr(im)
    % electron app is running - need new instance
    strDB=im;
    strDB=strrep(strDB,'/','*');
    strDB=strrep(strDB,'\','*');
    url = [obj.host ':' num2str(obj.port) '/strDB/' strDB];
    webwrite(url,'');
    return
end

chksrv = obj.check_server(host);
if ( isempty(chksrv) )
    msg=['Can''t find server: ' host ':' num2str(port)];
    warning(msg);
    return;
end

sendProvider = http.io.LBinProvider(im,imD);
req = matlab.net.http.RequestMessage('post', [], sendProvider);

url = [host ':' num2str(port) '/loadfig'];
resp = req.send(url);
end

function launch_electron(port,fignum,workdir, leverpath,strDB)
if ( ispc() )
    launch_electron_windows(port,fignum, workdir, leverpath,strDB);
elseif ( ismac() )
    launch_electron_mac(port,fignum, workdir, leverpath,strDB);
elseif ( isunix() )
    launch_electron_posix(port,fignum, workdir, leverpath,strDB);
else
    error('Unsupported operating system!');
end
end

function launch_electron_mac(port,fignum,workdir, leverpath,strDB)

if ( ~isempty(leverpath) )
    % mac matlab does not have /usr/local/bin on path
    % that is typically where nodejs goes
    % add it to path
    % if this fails, check and fix that node is on the path that matlab 
    % finds in path1
    path1 = getenv('PATH');
    path1 = [path1 ':/usr/local/bin'];
    setenv('PATH', path1);
    elec_path = fullfile(leverpath,'node_modules','.bin','electron');
    elec_cmd = [elec_path ' ' fullfile(leverpath,'elever','main.js')];
else
    % run from installed app leverjs
    elec_cmd = ['open -a leverjs -n --args --root=' pwd() ' '];
end
if exist('strDB','var') && ~isempty(strDB)
    elec_cmd = [elec_cmd ' --leverFile=' strDB ' '];
end
cmd = [elec_cmd ' --port=' num2str(port) ' --title="figure ' num2str(fignum) '"' ' &'];
system(cmd);
end

function launch_electron_posix(port,fignum,workdir, leverpath,strDB)
elec_cmd = 'leverjs';
px = getenv('PATH');
if ( ~isempty(leverpath) )
        % first try NVM
        nvm_path = getenv('NVM_DIR');
        if ~isempty(nvm_path)
            [ret,elec_path] = system('source ~/.nvm/nvm.sh;which electron');  
            elec_path = replace(elec_path,newline,'');
            nodePath = fileparts(elec_path);            
            px = [px ':' nodePath];
        else
            elec_path = fullfile(leverpath,'node_modules','.bin','electron');            
        end
        elec_cmd = [elec_path ' ' fullfile(leverpath,'elever','main.js')];
else
    [status,~] = system(['which ' elec_cmd]);
    if ( status ~= 0 )
        error(['Cannot find ' elec_cmd ' please add to system path!']);
    end
end
if exist('strDB','var') && ~isempty(strDB)
    elec_cmd = [elec_cmd ' --leverFile=' strDB ' '];
end
cmd = [elec_cmd ' --port=' num2str(port) ' --title="figure ' num2str(fignum) '"' ' &']
system(cmd,'PATH',px);
end

function launch_electron_windows(port,fignum,workdir, leverpath, strDB)
elec_cmd = 'leverjs.exe';
if ( ~isempty(leverpath) )
    elec_path = fullfile(leverpath,'node_modules','.bin','electron.cmd');
    elec_cmd = [elec_path ' ' fullfile(leverpath,'elever','main.js')];
else
    [status,~] = system(['where ' elec_cmd]);
    if ( status ~= 0 )
        error(['Cannot find ' elec_cmd ' please add to system path!']);
    end
end
if exist('strDB','var') && ~isempty(strDB)
    elec_cmd = [elec_cmd ' --leverFile=' strDB ' '];
end
cmd = [elec_cmd ' --port=' num2str(port) ' --title="figure ' num2str(fignum) '"' ' &'];
status = system(cmd);
end