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@@ -1,366 +1,372 | |||||
1 | # encoding: utf-8 |
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1 | # encoding: utf-8 | |
2 | """ |
|
2 | """ | |
3 | Paging capabilities for IPython.core |
|
3 | Paging capabilities for IPython.core | |
4 |
|
4 | |||
5 | Notes |
|
5 | Notes | |
6 | ----- |
|
6 | ----- | |
7 |
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7 | |||
8 | For now this uses IPython hooks, so it can't be in IPython.utils. If we can get |
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8 | For now this uses IPython hooks, so it can't be in IPython.utils. If we can get | |
9 | rid of that dependency, we could move it there. |
|
9 | rid of that dependency, we could move it there. | |
10 | ----- |
|
10 | ----- | |
11 | """ |
|
11 | """ | |
12 |
|
12 | |||
13 | # Copyright (c) IPython Development Team. |
|
13 | # Copyright (c) IPython Development Team. | |
14 | # Distributed under the terms of the Modified BSD License. |
|
14 | # Distributed under the terms of the Modified BSD License. | |
15 |
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15 | |||
16 |
|
16 | |||
17 | import os |
|
17 | import os | |
|
18 | import io | |||
18 | import re |
|
19 | import re | |
19 | import sys |
|
20 | import sys | |
20 | import tempfile |
|
21 | import tempfile | |
|
22 | import subprocess | |||
21 |
|
23 | |||
22 | from io import UnsupportedOperation |
|
24 | from io import UnsupportedOperation | |
23 |
|
25 | |||
24 | from IPython import get_ipython |
|
26 | from IPython import get_ipython | |
25 | from IPython.core.display import display |
|
27 | from IPython.core.display import display | |
26 | from IPython.core.error import TryNext |
|
28 | from IPython.core.error import TryNext | |
27 | from IPython.utils.data import chop |
|
29 | from IPython.utils.data import chop | |
28 | from IPython.utils.process import system |
|
30 | from IPython.utils.process import system | |
29 | from IPython.utils.terminal import get_terminal_size |
|
31 | from IPython.utils.terminal import get_terminal_size | |
30 | from IPython.utils import py3compat |
|
32 | from IPython.utils import py3compat | |
31 |
|
33 | |||
32 |
|
34 | |||
33 | def display_page(strng, start=0, screen_lines=25): |
|
35 | def display_page(strng, start=0, screen_lines=25): | |
34 | """Just display, no paging. screen_lines is ignored.""" |
|
36 | """Just display, no paging. screen_lines is ignored.""" | |
35 | if isinstance(strng, dict): |
|
37 | if isinstance(strng, dict): | |
36 | data = strng |
|
38 | data = strng | |
37 | else: |
|
39 | else: | |
38 | if start: |
|
40 | if start: | |
39 | strng = u'\n'.join(strng.splitlines()[start:]) |
|
41 | strng = u'\n'.join(strng.splitlines()[start:]) | |
40 | data = { 'text/plain': strng } |
|
42 | data = { 'text/plain': strng } | |
41 | display(data, raw=True) |
|
43 | display(data, raw=True) | |
42 |
|
44 | |||
43 |
|
45 | |||
44 | def as_hook(page_func): |
|
46 | def as_hook(page_func): | |
45 | """Wrap a pager func to strip the `self` arg |
|
47 | """Wrap a pager func to strip the `self` arg | |
46 |
|
48 | |||
47 | so it can be called as a hook. |
|
49 | so it can be called as a hook. | |
48 | """ |
|
50 | """ | |
49 | return lambda self, *args, **kwargs: page_func(*args, **kwargs) |
|
51 | return lambda self, *args, **kwargs: page_func(*args, **kwargs) | |
50 |
|
52 | |||
51 |
|
53 | |||
52 | esc_re = re.compile(r"(\x1b[^m]+m)") |
|
54 | esc_re = re.compile(r"(\x1b[^m]+m)") | |
53 |
|
55 | |||
54 | def page_dumb(strng, start=0, screen_lines=25): |
|
56 | def page_dumb(strng, start=0, screen_lines=25): | |
55 | """Very dumb 'pager' in Python, for when nothing else works. |
|
57 | """Very dumb 'pager' in Python, for when nothing else works. | |
56 |
|
58 | |||
57 | Only moves forward, same interface as page(), except for pager_cmd and |
|
59 | Only moves forward, same interface as page(), except for pager_cmd and | |
58 | mode. |
|
60 | mode. | |
59 | """ |
|
61 | """ | |
60 | if isinstance(strng, dict): |
|
62 | if isinstance(strng, dict): | |
61 | strng = strng.get('text/plain', '') |
|
63 | strng = strng.get('text/plain', '') | |
62 | out_ln = strng.splitlines()[start:] |
|
64 | out_ln = strng.splitlines()[start:] | |
63 | screens = chop(out_ln,screen_lines-1) |
|
65 | screens = chop(out_ln,screen_lines-1) | |
64 | if len(screens) == 1: |
|
66 | if len(screens) == 1: | |
65 | print(os.linesep.join(screens[0])) |
|
67 | print(os.linesep.join(screens[0])) | |
66 | else: |
|
68 | else: | |
67 | last_escape = "" |
|
69 | last_escape = "" | |
68 | for scr in screens[0:-1]: |
|
70 | for scr in screens[0:-1]: | |
69 | hunk = os.linesep.join(scr) |
|
71 | hunk = os.linesep.join(scr) | |
70 | print(last_escape + hunk) |
|
72 | print(last_escape + hunk) | |
71 | if not page_more(): |
|
73 | if not page_more(): | |
72 | return |
|
74 | return | |
73 | esc_list = esc_re.findall(hunk) |
|
75 | esc_list = esc_re.findall(hunk) | |
74 | if len(esc_list) > 0: |
|
76 | if len(esc_list) > 0: | |
75 | last_escape = esc_list[-1] |
|
77 | last_escape = esc_list[-1] | |
76 | print(last_escape + os.linesep.join(screens[-1])) |
|
78 | print(last_escape + os.linesep.join(screens[-1])) | |
77 |
|
79 | |||
78 | def _detect_screen_size(screen_lines_def): |
|
80 | def _detect_screen_size(screen_lines_def): | |
79 | """Attempt to work out the number of lines on the screen. |
|
81 | """Attempt to work out the number of lines on the screen. | |
80 |
|
82 | |||
81 | This is called by page(). It can raise an error (e.g. when run in the |
|
83 | This is called by page(). It can raise an error (e.g. when run in the | |
82 | test suite), so it's separated out so it can easily be called in a try block. |
|
84 | test suite), so it's separated out so it can easily be called in a try block. | |
83 | """ |
|
85 | """ | |
84 | TERM = os.environ.get('TERM',None) |
|
86 | TERM = os.environ.get('TERM',None) | |
85 | if not((TERM=='xterm' or TERM=='xterm-color') and sys.platform != 'sunos5'): |
|
87 | if not((TERM=='xterm' or TERM=='xterm-color') and sys.platform != 'sunos5'): | |
86 | # curses causes problems on many terminals other than xterm, and |
|
88 | # curses causes problems on many terminals other than xterm, and | |
87 | # some termios calls lock up on Sun OS5. |
|
89 | # some termios calls lock up on Sun OS5. | |
88 | return screen_lines_def |
|
90 | return screen_lines_def | |
89 |
|
91 | |||
90 | try: |
|
92 | try: | |
91 | import termios |
|
93 | import termios | |
92 | import curses |
|
94 | import curses | |
93 | except ImportError: |
|
95 | except ImportError: | |
94 | return screen_lines_def |
|
96 | return screen_lines_def | |
95 |
|
97 | |||
96 | # There is a bug in curses, where *sometimes* it fails to properly |
|
98 | # There is a bug in curses, where *sometimes* it fails to properly | |
97 | # initialize, and then after the endwin() call is made, the |
|
99 | # initialize, and then after the endwin() call is made, the | |
98 | # terminal is left in an unusable state. Rather than trying to |
|
100 | # terminal is left in an unusable state. Rather than trying to | |
99 | # check every time for this (by requesting and comparing termios |
|
101 | # check every time for this (by requesting and comparing termios | |
100 | # flags each time), we just save the initial terminal state and |
|
102 | # flags each time), we just save the initial terminal state and | |
101 | # unconditionally reset it every time. It's cheaper than making |
|
103 | # unconditionally reset it every time. It's cheaper than making | |
102 | # the checks. |
|
104 | # the checks. | |
103 | try: |
|
105 | try: | |
104 | term_flags = termios.tcgetattr(sys.stdout) |
|
106 | term_flags = termios.tcgetattr(sys.stdout) | |
105 | except termios.error as err: |
|
107 | except termios.error as err: | |
106 | # can fail on Linux 2.6, pager_page will catch the TypeError |
|
108 | # can fail on Linux 2.6, pager_page will catch the TypeError | |
107 | raise TypeError('termios error: {0}'.format(err)) |
|
109 | raise TypeError('termios error: {0}'.format(err)) | |
108 |
|
110 | |||
109 | try: |
|
111 | try: | |
110 | scr = curses.initscr() |
|
112 | scr = curses.initscr() | |
111 | except AttributeError: |
|
113 | except AttributeError: | |
112 | # Curses on Solaris may not be complete, so we can't use it there |
|
114 | # Curses on Solaris may not be complete, so we can't use it there | |
113 | return screen_lines_def |
|
115 | return screen_lines_def | |
114 |
|
116 | |||
115 | screen_lines_real,screen_cols = scr.getmaxyx() |
|
117 | screen_lines_real,screen_cols = scr.getmaxyx() | |
116 | curses.endwin() |
|
118 | curses.endwin() | |
117 |
|
119 | |||
118 | # Restore terminal state in case endwin() didn't. |
|
120 | # Restore terminal state in case endwin() didn't. | |
119 | termios.tcsetattr(sys.stdout,termios.TCSANOW,term_flags) |
|
121 | termios.tcsetattr(sys.stdout,termios.TCSANOW,term_flags) | |
120 | # Now we have what we needed: the screen size in rows/columns |
|
122 | # Now we have what we needed: the screen size in rows/columns | |
121 | return screen_lines_real |
|
123 | return screen_lines_real | |
122 | #print '***Screen size:',screen_lines_real,'lines x',\ |
|
124 | #print '***Screen size:',screen_lines_real,'lines x',\ | |
123 | #screen_cols,'columns.' # dbg |
|
125 | #screen_cols,'columns.' # dbg | |
124 |
|
126 | |||
125 | def pager_page(strng, start=0, screen_lines=0, pager_cmd=None): |
|
127 | def pager_page(strng, start=0, screen_lines=0, pager_cmd=None): | |
126 | """Display a string, piping through a pager after a certain length. |
|
128 | """Display a string, piping through a pager after a certain length. | |
127 |
|
129 | |||
128 | strng can be a mime-bundle dict, supplying multiple representations, |
|
130 | strng can be a mime-bundle dict, supplying multiple representations, | |
129 | keyed by mime-type. |
|
131 | keyed by mime-type. | |
130 |
|
132 | |||
131 | The screen_lines parameter specifies the number of *usable* lines of your |
|
133 | The screen_lines parameter specifies the number of *usable* lines of your | |
132 | terminal screen (total lines minus lines you need to reserve to show other |
|
134 | terminal screen (total lines minus lines you need to reserve to show other | |
133 | information). |
|
135 | information). | |
134 |
|
136 | |||
135 | If you set screen_lines to a number <=0, page() will try to auto-determine |
|
137 | If you set screen_lines to a number <=0, page() will try to auto-determine | |
136 | your screen size and will only use up to (screen_size+screen_lines) for |
|
138 | your screen size and will only use up to (screen_size+screen_lines) for | |
137 | printing, paging after that. That is, if you want auto-detection but need |
|
139 | printing, paging after that. That is, if you want auto-detection but need | |
138 | to reserve the bottom 3 lines of the screen, use screen_lines = -3, and for |
|
140 | to reserve the bottom 3 lines of the screen, use screen_lines = -3, and for | |
139 | auto-detection without any lines reserved simply use screen_lines = 0. |
|
141 | auto-detection without any lines reserved simply use screen_lines = 0. | |
140 |
|
142 | |||
141 | If a string won't fit in the allowed lines, it is sent through the |
|
143 | If a string won't fit in the allowed lines, it is sent through the | |
142 | specified pager command. If none given, look for PAGER in the environment, |
|
144 | specified pager command. If none given, look for PAGER in the environment, | |
143 | and ultimately default to less. |
|
145 | and ultimately default to less. | |
144 |
|
146 | |||
145 | If no system pager works, the string is sent through a 'dumb pager' |
|
147 | If no system pager works, the string is sent through a 'dumb pager' | |
146 | written in python, very simplistic. |
|
148 | written in python, very simplistic. | |
147 | """ |
|
149 | """ | |
148 |
|
150 | |||
149 | # for compatibility with mime-bundle form: |
|
151 | # for compatibility with mime-bundle form: | |
150 | if isinstance(strng, dict): |
|
152 | if isinstance(strng, dict): | |
151 | strng = strng['text/plain'] |
|
153 | strng = strng['text/plain'] | |
152 |
|
154 | |||
153 | # Ugly kludge, but calling curses.initscr() flat out crashes in emacs |
|
155 | # Ugly kludge, but calling curses.initscr() flat out crashes in emacs | |
154 | TERM = os.environ.get('TERM','dumb') |
|
156 | TERM = os.environ.get('TERM','dumb') | |
155 | if TERM in ['dumb','emacs'] and os.name != 'nt': |
|
157 | if TERM in ['dumb','emacs'] and os.name != 'nt': | |
156 | print(strng) |
|
158 | print(strng) | |
157 | return |
|
159 | return | |
158 | # chop off the topmost part of the string we don't want to see |
|
160 | # chop off the topmost part of the string we don't want to see | |
159 | str_lines = strng.splitlines()[start:] |
|
161 | str_lines = strng.splitlines()[start:] | |
160 | str_toprint = os.linesep.join(str_lines) |
|
162 | str_toprint = os.linesep.join(str_lines) | |
161 | num_newlines = len(str_lines) |
|
163 | num_newlines = len(str_lines) | |
162 | len_str = len(str_toprint) |
|
164 | len_str = len(str_toprint) | |
163 |
|
165 | |||
164 | # Dumb heuristics to guesstimate number of on-screen lines the string |
|
166 | # Dumb heuristics to guesstimate number of on-screen lines the string | |
165 | # takes. Very basic, but good enough for docstrings in reasonable |
|
167 | # takes. Very basic, but good enough for docstrings in reasonable | |
166 | # terminals. If someone later feels like refining it, it's not hard. |
|
168 | # terminals. If someone later feels like refining it, it's not hard. | |
167 | numlines = max(num_newlines,int(len_str/80)+1) |
|
169 | numlines = max(num_newlines,int(len_str/80)+1) | |
168 |
|
170 | |||
169 | screen_lines_def = get_terminal_size()[1] |
|
171 | screen_lines_def = get_terminal_size()[1] | |
170 |
|
172 | |||
171 | # auto-determine screen size |
|
173 | # auto-determine screen size | |
172 | if screen_lines <= 0: |
|
174 | if screen_lines <= 0: | |
173 | try: |
|
175 | try: | |
174 | screen_lines += _detect_screen_size(screen_lines_def) |
|
176 | screen_lines += _detect_screen_size(screen_lines_def) | |
175 | except (TypeError, UnsupportedOperation): |
|
177 | except (TypeError, UnsupportedOperation): | |
176 | print(str_toprint) |
|
178 | print(str_toprint) | |
177 | return |
|
179 | return | |
178 |
|
180 | |||
179 | #print 'numlines',numlines,'screenlines',screen_lines # dbg |
|
181 | #print 'numlines',numlines,'screenlines',screen_lines # dbg | |
180 | if numlines <= screen_lines : |
|
182 | if numlines <= screen_lines : | |
181 | #print '*** normal print' # dbg |
|
183 | #print '*** normal print' # dbg | |
182 | print(str_toprint) |
|
184 | print(str_toprint) | |
183 | else: |
|
185 | else: | |
184 | # Try to open pager and default to internal one if that fails. |
|
186 | # Try to open pager and default to internal one if that fails. | |
185 | # All failure modes are tagged as 'retval=1', to match the return |
|
187 | # All failure modes are tagged as 'retval=1', to match the return | |
186 | # value of a failed system command. If any intermediate attempt |
|
188 | # value of a failed system command. If any intermediate attempt | |
187 | # sets retval to 1, at the end we resort to our own page_dumb() pager. |
|
189 | # sets retval to 1, at the end we resort to our own page_dumb() pager. | |
188 | pager_cmd = get_pager_cmd(pager_cmd) |
|
190 | pager_cmd = get_pager_cmd(pager_cmd) | |
189 | pager_cmd += ' ' + get_pager_start(pager_cmd,start) |
|
191 | pager_cmd += ' ' + get_pager_start(pager_cmd,start) | |
190 | if os.name == 'nt': |
|
192 | if os.name == 'nt': | |
191 | if pager_cmd.startswith('type'): |
|
193 | if pager_cmd.startswith('type'): | |
192 | # The default WinXP 'type' command is failing on complex strings. |
|
194 | # The default WinXP 'type' command is failing on complex strings. | |
193 | retval = 1 |
|
195 | retval = 1 | |
194 | else: |
|
196 | else: | |
195 | fd, tmpname = tempfile.mkstemp('.txt') |
|
197 | fd, tmpname = tempfile.mkstemp('.txt') | |
196 | try: |
|
198 | try: | |
197 | os.close(fd) |
|
199 | os.close(fd) | |
198 | with open(tmpname, 'wt') as tmpfile: |
|
200 | with open(tmpname, 'wt') as tmpfile: | |
199 | tmpfile.write(strng) |
|
201 | tmpfile.write(strng) | |
200 | cmd = "%s < %s" % (pager_cmd, tmpname) |
|
202 | cmd = "%s < %s" % (pager_cmd, tmpname) | |
201 | # tmpfile needs to be closed for windows |
|
203 | # tmpfile needs to be closed for windows | |
202 | if os.system(cmd): |
|
204 | if os.system(cmd): | |
203 | retval = 1 |
|
205 | retval = 1 | |
204 | else: |
|
206 | else: | |
205 | retval = None |
|
207 | retval = None | |
206 | finally: |
|
208 | finally: | |
207 | os.remove(tmpname) |
|
209 | os.remove(tmpname) | |
208 | else: |
|
210 | else: | |
209 | try: |
|
211 | try: | |
210 | retval = None |
|
212 | retval = None | |
211 | # if I use popen4, things hang. No idea why. |
|
213 | # Emulate os.popen, but redirect stderr | |
212 |
|
|
214 | proc = subprocess.Popen(pager_cmd, | |
213 | pager = os.popen(pager_cmd + ' 2>/dev/null', 'w') |
|
215 | shell=True, | |
|
216 | stdin=subprocess.PIPE, | |||
|
217 | stderr=subprocess.DEVNULL | |||
|
218 | ) | |||
|
219 | pager = os._wrap_close(io.TextIOWrapper(proc.stdin), proc) | |||
214 | try: |
|
220 | try: | |
215 | pager_encoding = pager.encoding or sys.stdout.encoding |
|
221 | pager_encoding = pager.encoding or sys.stdout.encoding | |
216 | pager.write(strng) |
|
222 | pager.write(strng) | |
217 | finally: |
|
223 | finally: | |
218 | retval = pager.close() |
|
224 | retval = pager.close() | |
219 | except IOError as msg: # broken pipe when user quits |
|
225 | except IOError as msg: # broken pipe when user quits | |
220 | if msg.args == (32, 'Broken pipe'): |
|
226 | if msg.args == (32, 'Broken pipe'): | |
221 | retval = None |
|
227 | retval = None | |
222 | else: |
|
228 | else: | |
223 | retval = 1 |
|
229 | retval = 1 | |
224 | except OSError: |
|
230 | except OSError: | |
225 | # Other strange problems, sometimes seen in Win2k/cygwin |
|
231 | # Other strange problems, sometimes seen in Win2k/cygwin | |
226 | retval = 1 |
|
232 | retval = 1 | |
227 | if retval is not None: |
|
233 | if retval is not None: | |
228 | page_dumb(strng,screen_lines=screen_lines) |
|
234 | page_dumb(strng,screen_lines=screen_lines) | |
229 |
|
235 | |||
230 |
|
236 | |||
231 | def page(data, start=0, screen_lines=0, pager_cmd=None): |
|
237 | def page(data, start=0, screen_lines=0, pager_cmd=None): | |
232 | """Display content in a pager, piping through a pager after a certain length. |
|
238 | """Display content in a pager, piping through a pager after a certain length. | |
233 |
|
239 | |||
234 | data can be a mime-bundle dict, supplying multiple representations, |
|
240 | data can be a mime-bundle dict, supplying multiple representations, | |
235 | keyed by mime-type, or text. |
|
241 | keyed by mime-type, or text. | |
236 |
|
242 | |||
237 | Pager is dispatched via the `show_in_pager` IPython hook. |
|
243 | Pager is dispatched via the `show_in_pager` IPython hook. | |
238 | If no hook is registered, `pager_page` will be used. |
|
244 | If no hook is registered, `pager_page` will be used. | |
239 | """ |
|
245 | """ | |
240 | # Some routines may auto-compute start offsets incorrectly and pass a |
|
246 | # Some routines may auto-compute start offsets incorrectly and pass a | |
241 | # negative value. Offset to 0 for robustness. |
|
247 | # negative value. Offset to 0 for robustness. | |
242 | start = max(0, start) |
|
248 | start = max(0, start) | |
243 |
|
249 | |||
244 | # first, try the hook |
|
250 | # first, try the hook | |
245 | ip = get_ipython() |
|
251 | ip = get_ipython() | |
246 | if ip: |
|
252 | if ip: | |
247 | try: |
|
253 | try: | |
248 | ip.hooks.show_in_pager(data, start=start, screen_lines=screen_lines) |
|
254 | ip.hooks.show_in_pager(data, start=start, screen_lines=screen_lines) | |
249 | return |
|
255 | return | |
250 | except TryNext: |
|
256 | except TryNext: | |
251 | pass |
|
257 | pass | |
252 |
|
258 | |||
253 | # fallback on default pager |
|
259 | # fallback on default pager | |
254 | return pager_page(data, start, screen_lines, pager_cmd) |
|
260 | return pager_page(data, start, screen_lines, pager_cmd) | |
255 |
|
261 | |||
256 |
|
262 | |||
257 | def page_file(fname, start=0, pager_cmd=None): |
|
263 | def page_file(fname, start=0, pager_cmd=None): | |
258 | """Page a file, using an optional pager command and starting line. |
|
264 | """Page a file, using an optional pager command and starting line. | |
259 | """ |
|
265 | """ | |
260 |
|
266 | |||
261 | pager_cmd = get_pager_cmd(pager_cmd) |
|
267 | pager_cmd = get_pager_cmd(pager_cmd) | |
262 | pager_cmd += ' ' + get_pager_start(pager_cmd,start) |
|
268 | pager_cmd += ' ' + get_pager_start(pager_cmd,start) | |
263 |
|
269 | |||
264 | try: |
|
270 | try: | |
265 | if os.environ['TERM'] in ['emacs','dumb']: |
|
271 | if os.environ['TERM'] in ['emacs','dumb']: | |
266 | raise EnvironmentError |
|
272 | raise EnvironmentError | |
267 | system(pager_cmd + ' ' + fname) |
|
273 | system(pager_cmd + ' ' + fname) | |
268 | except: |
|
274 | except: | |
269 | try: |
|
275 | try: | |
270 | if start > 0: |
|
276 | if start > 0: | |
271 | start -= 1 |
|
277 | start -= 1 | |
272 | page(open(fname).read(),start) |
|
278 | page(open(fname).read(),start) | |
273 | except: |
|
279 | except: | |
274 | print('Unable to show file',repr(fname)) |
|
280 | print('Unable to show file',repr(fname)) | |
275 |
|
281 | |||
276 |
|
282 | |||
277 | def get_pager_cmd(pager_cmd=None): |
|
283 | def get_pager_cmd(pager_cmd=None): | |
278 | """Return a pager command. |
|
284 | """Return a pager command. | |
279 |
|
285 | |||
280 | Makes some attempts at finding an OS-correct one. |
|
286 | Makes some attempts at finding an OS-correct one. | |
281 | """ |
|
287 | """ | |
282 | if os.name == 'posix': |
|
288 | if os.name == 'posix': | |
283 | default_pager_cmd = 'less -R' # -R for color control sequences |
|
289 | default_pager_cmd = 'less -R' # -R for color control sequences | |
284 | elif os.name in ['nt','dos']: |
|
290 | elif os.name in ['nt','dos']: | |
285 | default_pager_cmd = 'type' |
|
291 | default_pager_cmd = 'type' | |
286 |
|
292 | |||
287 | if pager_cmd is None: |
|
293 | if pager_cmd is None: | |
288 | try: |
|
294 | try: | |
289 | pager_cmd = os.environ['PAGER'] |
|
295 | pager_cmd = os.environ['PAGER'] | |
290 | except: |
|
296 | except: | |
291 | pager_cmd = default_pager_cmd |
|
297 | pager_cmd = default_pager_cmd | |
292 |
|
298 | |||
293 | if pager_cmd == 'less' and '-r' not in os.environ.get('LESS', '').lower(): |
|
299 | if pager_cmd == 'less' and '-r' not in os.environ.get('LESS', '').lower(): | |
294 | pager_cmd += ' -R' |
|
300 | pager_cmd += ' -R' | |
295 |
|
301 | |||
296 | return pager_cmd |
|
302 | return pager_cmd | |
297 |
|
303 | |||
298 |
|
304 | |||
299 | def get_pager_start(pager, start): |
|
305 | def get_pager_start(pager, start): | |
300 | """Return the string for paging files with an offset. |
|
306 | """Return the string for paging files with an offset. | |
301 |
|
307 | |||
302 | This is the '+N' argument which less and more (under Unix) accept. |
|
308 | This is the '+N' argument which less and more (under Unix) accept. | |
303 | """ |
|
309 | """ | |
304 |
|
310 | |||
305 | if pager in ['less','more']: |
|
311 | if pager in ['less','more']: | |
306 | if start: |
|
312 | if start: | |
307 | start_string = '+' + str(start) |
|
313 | start_string = '+' + str(start) | |
308 | else: |
|
314 | else: | |
309 | start_string = '' |
|
315 | start_string = '' | |
310 | else: |
|
316 | else: | |
311 | start_string = '' |
|
317 | start_string = '' | |
312 | return start_string |
|
318 | return start_string | |
313 |
|
319 | |||
314 |
|
320 | |||
315 | # (X)emacs on win32 doesn't like to be bypassed with msvcrt.getch() |
|
321 | # (X)emacs on win32 doesn't like to be bypassed with msvcrt.getch() | |
316 | if os.name == 'nt' and os.environ.get('TERM','dumb') != 'emacs': |
|
322 | if os.name == 'nt' and os.environ.get('TERM','dumb') != 'emacs': | |
317 | import msvcrt |
|
323 | import msvcrt | |
318 | def page_more(): |
|
324 | def page_more(): | |
319 | """ Smart pausing between pages |
|
325 | """ Smart pausing between pages | |
320 |
|
326 | |||
321 | @return: True if need print more lines, False if quit |
|
327 | @return: True if need print more lines, False if quit | |
322 | """ |
|
328 | """ | |
323 | sys.stdout.write('---Return to continue, q to quit--- ') |
|
329 | sys.stdout.write('---Return to continue, q to quit--- ') | |
324 | ans = msvcrt.getwch() |
|
330 | ans = msvcrt.getwch() | |
325 | if ans in ("q", "Q"): |
|
331 | if ans in ("q", "Q"): | |
326 | result = False |
|
332 | result = False | |
327 | else: |
|
333 | else: | |
328 | result = True |
|
334 | result = True | |
329 | sys.stdout.write("\b"*37 + " "*37 + "\b"*37) |
|
335 | sys.stdout.write("\b"*37 + " "*37 + "\b"*37) | |
330 | return result |
|
336 | return result | |
331 | else: |
|
337 | else: | |
332 | def page_more(): |
|
338 | def page_more(): | |
333 | ans = py3compat.input('---Return to continue, q to quit--- ') |
|
339 | ans = py3compat.input('---Return to continue, q to quit--- ') | |
334 | if ans.lower().startswith('q'): |
|
340 | if ans.lower().startswith('q'): | |
335 | return False |
|
341 | return False | |
336 | else: |
|
342 | else: | |
337 | return True |
|
343 | return True | |
338 |
|
344 | |||
339 |
|
345 | |||
340 | def snip_print(str,width = 75,print_full = 0,header = ''): |
|
346 | def snip_print(str,width = 75,print_full = 0,header = ''): | |
341 | """Print a string snipping the midsection to fit in width. |
|
347 | """Print a string snipping the midsection to fit in width. | |
342 |
|
348 | |||
343 | print_full: mode control: |
|
349 | print_full: mode control: | |
344 |
|
350 | |||
345 | - 0: only snip long strings |
|
351 | - 0: only snip long strings | |
346 | - 1: send to page() directly. |
|
352 | - 1: send to page() directly. | |
347 | - 2: snip long strings and ask for full length viewing with page() |
|
353 | - 2: snip long strings and ask for full length viewing with page() | |
348 |
|
354 | |||
349 | Return 1 if snipping was necessary, 0 otherwise.""" |
|
355 | Return 1 if snipping was necessary, 0 otherwise.""" | |
350 |
|
356 | |||
351 | if print_full == 1: |
|
357 | if print_full == 1: | |
352 | page(header+str) |
|
358 | page(header+str) | |
353 | return 0 |
|
359 | return 0 | |
354 |
|
360 | |||
355 | print(header, end=' ') |
|
361 | print(header, end=' ') | |
356 | if len(str) < width: |
|
362 | if len(str) < width: | |
357 | print(str) |
|
363 | print(str) | |
358 | snip = 0 |
|
364 | snip = 0 | |
359 | else: |
|
365 | else: | |
360 | whalf = int((width -5)/2) |
|
366 | whalf = int((width -5)/2) | |
361 | print(str[:whalf] + ' <...> ' + str[-whalf:]) |
|
367 | print(str[:whalf] + ' <...> ' + str[-whalf:]) | |
362 | snip = 1 |
|
368 | snip = 1 | |
363 | if snip and print_full == 2: |
|
369 | if snip and print_full == 2: | |
364 | if py3compat.input(header+' Snipped. View (y/n)? [N]').lower() == 'y': |
|
370 | if py3compat.input(header+' Snipped. View (y/n)? [N]').lower() == 'y': | |
365 | page(str) |
|
371 | page(str) | |
366 | return snip |
|
372 | return snip |
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