From 79d6d344d808fe5a4be7d6ff1df445c2b1995b78 Mon Sep 17 00:00:00 2001 From: Stephen Fromm Date: Fri, 11 Oct 2013 10:21:29 -0700 Subject: [PATCH] Add pager support to ansible-doc If PAGER is set, or the executable less is present, ansible-doc will use it to pipe information into so that it can be scrolled through. If the environment variable LESS is not set, this will set it to FRSX. --- bin/ansible-doc | 127 +++++++++++++++++++++++++++++++++--------------- 1 file changed, 88 insertions(+), 39 deletions(-) diff --git a/bin/ansible-doc b/bin/ansible-doc index c6dfc8f6bc..76971c112c 100755 --- a/bin/ansible-doc +++ b/bin/ansible-doc @@ -24,6 +24,7 @@ import textwrap import re import optparse import datetime +import subprocess from ansible import utils from ansible.utils import module_docs import ansible.constants as C @@ -39,6 +40,40 @@ _BOLD = re.compile(r"B\(([^)]+)\)") _MODULE = re.compile(r"M\(([^)]+)\)") _URL = re.compile(r"U\(([^)]+)\)") _CONST = re.compile(r"C\(([^)]+)\)") +PAGER = 'less' +LESS_OPTS = 'FRSX' # -F (quit-if-one-screen) -R (allow raw ansi control chars) + # -S (chop long lines) -X (disable termcap init and de-init) + +def pager_print(text): + ''' just print text ''' + print text + +def pager_pipe(text, cmd): + ''' pipe text through a pager ''' + if 'LESS' not in os.environ: + os.environ['LESS'] = LESS_OPTS + try: + cmd = subprocess.Popen(cmd, shell=True, stdin=subprocess.PIPE, stdout=sys.stdout) + cmd.communicate(input=text) + except IOError: + pass + except KeyboardInterrupt: + pass + +def pager(text): + ''' find reasonable way to display text ''' + # this is a much simpler form of what is in pydoc.py + if not sys.stdout.isatty(): + pager_print(text) + elif 'PAGER' in os.environ: + if sys.platform == 'win32': + pager_print(text) + else: + pager_pipe(text, os.environ['PAGER']) + elif hasattr(os, 'system') and os.system('(less) 2> /dev/null') == 0: + pager_pipe(text, 'less') + else: + pager_print(text) def tty_ify(text): @@ -50,17 +85,18 @@ def tty_ify(text): return t -def print_man(doc): +def get_man_text(doc): opt_indent=" " - print "> %s\n" % doc['module'].upper() + text = [] + text.append("> %s\n" % doc['module'].upper()) desc = "".join(doc['description']) - print "%s\n" % textwrap.fill(tty_ify(desc), initial_indent=" ", subsequent_indent=" ") + text.append("%s\n" % textwrap.fill(tty_ify(desc), initial_indent=" ", subsequent_indent=" ")) if 'option_keys' in doc and len(doc['option_keys']) > 0: - print "Options (= is mandatory):\n" + text.append("Options (= is mandatory):\n") for o in doc['option_keys']: opt = doc['options'][o] @@ -70,47 +106,76 @@ def print_man(doc): else: opt_leadin = "-" - print "%s %s" % (opt_leadin, o) + text.append("%s %s" % (opt_leadin, o)) desc = "".join(opt['description']) if 'choices' in opt: choices = ", ".join(str(i) for i in opt['choices']) desc = desc + " (Choices: " + choices + ")" - print "%s\n" % textwrap.fill(tty_ify(desc), initial_indent=opt_indent, - subsequent_indent=opt_indent) + text.append("%s\n" % textwrap.fill(tty_ify(desc), initial_indent=opt_indent, + subsequent_indent=opt_indent)) if 'notes' in doc and len(doc['notes']) > 0: notes = "".join(doc['notes']) - print "Notes:%s\n" % textwrap.fill(tty_ify(notes), initial_indent=" ", - subsequent_indent=opt_indent) + text.append("Notes:%s\n" % textwrap.fill(tty_ify(notes), initial_indent=" ", + subsequent_indent=opt_indent)) if 'requirements' in doc and doc['requirements'] is not None and len(doc['requirements']) > 0: req = ", ".join(doc['requirements']) - print "Requirements:%s\n" % textwrap.fill(tty_ify(req), initial_indent=" ", - subsequent_indent=opt_indent) + text.append("Requirements:%s\n" % textwrap.fill(tty_ify(req), initial_indent=" ", + subsequent_indent=opt_indent)) if 'examples' in doc and len(doc['examples']) > 0: - print "Example%s:\n" % ('' if len(doc['examples']) < 2 else 's') + text.append("Example%s:\n" % ('' if len(doc['examples']) < 2 else 's')) for ex in doc['examples']: - print "%s\n" % (ex['code']) + text.append("%s\n" % (ex['code'])) if 'plainexamples' in doc and doc['plainexamples'] is not None: - print doc['plainexamples'] + text.append(doc['plainexamples']) + text.append('') + + return "\n".join(text) -def print_snippet(doc): +def get_snippet_text(doc): + text = [] desc = tty_ify("".join(doc['short_description'])) - print "- name: %s" % (desc) - print " action: %s" % (doc['module']) + text.append("- name: %s" % (desc)) + text.append(" action: %s" % (doc['module'])) for o in doc['options']: opt = doc['options'][o] desc = tty_ify("".join(opt['description'])) s = o + "=" - print " %-20s # %s" % (s, desc) + text.append(" %-20s # %s" % (s, desc)) + text.append('') + + return "\n".join(text) + +def get_module_list_text(module_list): + text = [] + for module in sorted(set(module_list)): + + if module in module_docs.BLACKLIST_MODULES: + continue + + filename = utils.plugins.module_finder.find_plugin(module) + if os.path.isdir(filename): + continue + try: + doc, plainexamples = module_docs.get_docstring(filename) + desc = tty_ify(doc.get('short_description', '?')) + if len(desc) > 55: + desc = desc + '...' + text.append("%-20s %-60.60s" % (module, desc)) + except: + traceback.print_exc() + sys.stderr.write("ERROR: module %s has a documentation error formatting or is missing documentation\n" % module) + pass + return "\n".join(text) def main(): @@ -155,25 +220,7 @@ def main(): continue module_list.append(module) - for module in sorted(set(module_list)): - - if module in module_docs.BLACKLIST_MODULES: - continue - - filename = utils.plugins.module_finder.find_plugin(module) - if os.path.isdir(filename): - continue - try: - doc, plainexamples = module_docs.get_docstring(filename) - desc = tty_ify(doc.get('short_description', '?')) - if len(desc) > 55: - desc = desc + '...' - print "%-20s %-60.60s" % (module, desc) - except: - traceback.print_exc() - sys.stderr.write("ERROR: module %s has a documentation error formatting or is missing documentation\n" % module) - pass - + pager(get_module_list_text(module_list)) sys.exit() if len(args) == 0: @@ -189,6 +236,7 @@ def main(): ret.append(i) return os.pathsep.join(ret) + text = '' for module in args: filename = utils.plugins.module_finder.find_plugin(module) @@ -221,13 +269,14 @@ def main(): doc['plainexamples'] = plainexamples if options.show_snippet: - print_snippet(doc) + text += get_snippet_text(doc) else: - print_man(doc) + text += get_man_text(doc) else: # this typically means we couldn't even parse the docstring, not just that the YAML is busted, # probably a quoting issue. sys.stderr.write("ERROR: module %s missing documentation (or could not parse documentation)\n" % module) + pager(text) if __name__ == '__main__': main()