Add script to generate lotus cli document.

Generate lotus command lines documents as text and markdown in folder "lotus/documentation/en".

scripts/generate-lotus-cli.py

@@ -0,0 +1,51 @@
+#!/usr/bin/env python
+# Generate lotus command lines documents as text and markdown in folder "lotus/documentation/en".
+# Python 2.7
+
+import os
+
+
+def generate_lotus_cli():
+    output_folder = '../documentation/en'
+    txt_file = open('%s/lotus-cli.txt' % output_folder, 'w')  # set the name of txt output
+    md_file = open('%s/lotus-cli.md' % output_folder, 'w')  # set the name of md output
+
+    def get_cmd_recursively(cur_cmd):
+        txt_file.writelines('\n\n%s\n' % cur_cmd[2:])
+        md_file.writelines('#' * cur_cmd.count(' ') + '# ' + cur_cmd[2:] + '\n')
+
+        cmd_flag = False
+
+        cmd_help_output = os.popen('cd ..' + ' && ' + cur_cmd + ' -h')
+        cmd_help_output_lines = cmd_help_output.readlines()
+
+        txt_file.writelines(cmd_help_output_lines)
+        md_file.writelines('```\n')
+        md_file.writelines(cmd_help_output_lines)
+        md_file.writelines('```\n')
+
+        for line in cmd_help_output_lines:
+            try:
+                line = line.strip()
+                if line == 'COMMANDS:':
+                    cmd_flag = True
+                if cmd_flag is True and line == '':
+                    cmd_flag = False
+                if cmd_flag is True and line[-1] != ':' and 'help, h' not in line:
+                    gap_pos = 0
+                    sub_cmd = line
+                    if ' ' in line:
+                        gap_pos = sub_cmd.index('  ')
+                    if gap_pos:
+                        sub_cmd = cur_cmd + ' ' + sub_cmd[:gap_pos]
+                    get_cmd_recursively(sub_cmd)
+            except Exception as e:
+                print('Fail to deal with "%s" with error:\n%s' % (line, e))
+
+    get_cmd_recursively('./lotus')
+    txt_file.close()
+    md_file.close()
+
+
+if __name__ == "__main__":
+    generate_lotus_cli()