private getSelectedCommand()

in src/extension.ts [224:283]
46 lines of code
10 McCabe index (conditional complexity)

    private getSelectedCommand(source: TextEditor) {
        const commandPrefix = "az";

        if (source.selection.isEmpty) {
            var lineNumber = source.selection.active.line;
            if (source.document.lineAt(lineNumber).text.length === 0) {
                window.showInformationMessage<any>("Please put the cursor on a line that contains a command (or part of a command).");
                return "";
            }
            
            // look upwards find the start of the command (if necessary)
            while(!source.document.lineAt(lineNumber).text.trim().toLowerCase().startsWith(commandPrefix)) {
                lineNumber--;
            }

            // this will be the first (maybe only) line of the command
            var command = this.stripComments(source.document.lineAt(lineNumber).text);

            while (command.trim().endsWith(this.continuationCharacter)) {
                // concatenate all lines into a single command
                lineNumber ++;
                command = command.trim().slice(0, -1) + this.stripComments(source.document.lineAt(lineNumber).text);
            }
            return command;
        } 
        else {
            // execute only the selected text
            const selectionStart = source.selection.start;
            const selectionEnd = source.selection.end;
            if (selectionStart.line === selectionEnd.line) {
                // single line command
                return this.stripComments(source.document.getText(new Range(selectionStart, selectionEnd)));
            }
            else {
                // multiline command
                command = this.stripComments(source.document.lineAt(selectionStart.line).text.substring(selectionStart.character));
                for (let index = selectionStart.line+1; index <= selectionEnd.line; index++) {
                    if (command.trim().endsWith(this.continuationCharacter)) {
                        command = command.trim().slice(0, -1);  // remove continuation character from command
                    }

                    var line = this.stripComments(source.document.lineAt(index).text);

                    if (line.trim().toLowerCase().startsWith(commandPrefix)) {
                        window.showErrorMessage<any>("Multiple command selection not supported");
                        return "";
                    }

                    // append this line to the command string
                    if (index === selectionEnd.line) {
                        command = command + line.substring(0, selectionEnd.character);  // only append up to the end of the selection
                    }
                    else {
                        command = command + line;
                    }
                }
                return command;
            }
        }
    }