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1 | TODO list for agedu |
2 | =================== |
3 | |
4 | Before it's non-embarrassingly releasable: |
5 | |
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6 | - work out what to do about atimes on directories in the absence of |
7 | the Linux syscall magic |
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8 | * one option is to read them during the scan and reinstate them |
9 | after each recursion pop. Race-condition prone. |
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10 | * marking them in a distinctive colour in the reports is another |
11 | option. |
12 | * a third option is simply to ignore space taken up by |
13 | directories in the first place; inaccurate but terribly simple. |
14 | * incidentally, sometimes open(...,O_NOATIME) will fail, and |
15 | then we have to fall back to ordinary open. Be prepared to do |
16 | this, which probably means getting rid of the icky macro |
17 | hackery in du.c and turning it into a more sensible run-time |
18 | abstraction layer. |
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19 | |
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20 | - polish the plain-text output to make it look more like du |
21 | + configurable recursive output depth |
22 | + show the right bits last |
23 | |
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24 | - cross-Unix portability: |
25 | + use autoconf |
26 | * configure use of stat64 |
27 | * configure use of /proc/net/tcp |
28 | * configure use of /dev/random |
29 | * configure use of Linux syscall magic replacing readdir |
30 | + later glibcs have fdopendir, hooray! So we can use that |
31 | too, if it's available and O_NOATIME is too. |
32 | * what do we do elsewhere about _GNU_SOURCE? |
33 | |
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34 | - man page, licence, --version. |
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35 | |
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36 | Future possibilities: |
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37 | |
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38 | - IPv6 support in the HTTP server |
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39 | * of course, Linux magic auth can still work in this context; we |
40 | merely have to be prepared to open one of /proc/net/tcp or |
41 | /proc/net/tcp6 as appropriate. |
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42 | |
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43 | - run-time configuration in the HTTP server |
44 | * I think this probably works by having a configuration form, or |
45 | a link pointing to one, somewhere on the report page. If you |
46 | want to reconfigure anything, you fill in and submit the form; |
47 | the web server receives HTTP GET with parameters and a |
48 | referer, adjusts its internal configuration, and returns an |
49 | HTTP redirect back to the referring page - which it then |
50 | re-renders in accordance with the change. |
51 | * All the same options should have their starting states |
52 | configurable on the command line too. |
53 | |
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54 | - curses-ish equivalent of the web output |
55 | + try using xterm 256-colour mode. Can (n)curses handle that? If |
56 | not, try doing it manually. |
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57 | + I think my current best idea is to bypass ncurses and go |
58 | straight to terminfo: generate lines of attribute-interleaved |
59 | text and display them, so we only really need the sequences |
60 | "go here and display stuff", "scroll up", "scroll down". |
61 | + I think the attribute-interleaved text might be possible to do |
62 | cunningly, as well: we autodetect a basically VT-style |
63 | terminal, and add 256-colour sequences on the end. So, for |
64 | instance, we might set ANSI-yellow foreground, set ANSI-red |
65 | background, _then_ set both foreground and background to the |
66 | appropriate xterm 256-colour, and then display some |
67 | appropriate character which would have given the right blend |
68 | of the ANSI-16 fore and background colours. Then the same |
69 | display code should gracefully degrade in the face of a |
70 | terminal which doesn't support xterm-256. |
71 | * current best plan is to simulate the xterm-256 shading from |
72 | 0/5 to 5/5 by doing space, colon and hash in colour A on |
73 | colour B background, then hash, colon and space in B on A |
74 | background. |
75 | + Infrastructure work before doing any of this would be to split |
76 | html.c into two: one part to prepare an abstract data |
77 | structure describing an HTML-like report (in particular, all |
78 | the index lookups, percentage calculation, vector arithmetic |
79 | and line sorting), and another part to generate the literal |
80 | HTML. Then the former can be reused to produce very similar |
81 | reports in coloured plain text. |
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82 | |
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83 | - http://msdn.microsoft.com/en-us/library/ms724290.aspx suggest |
84 | modern Windowses support atime-equivalents, so a Windows port is |
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85 | possible in principle. |
86 | + For a full Windows port, would need to modify the current |
87 | structure a lot, to abstract away (at least) memory-mapping of |
88 | files, details of disk scan procedure, networking for httpd. |
89 | Unclear what the right UI would be on Windows, too; |
90 | command-line exactly as now might be considered just a |
91 | _little_ unfriendly. Or perhaps not. |
92 | + Alternatively, a much easier approach would be to write a |
93 | Windows version of just the --scan-dump mode, which does a |
94 | filesystem scan via the Windows API and generates a valid |
95 | agedu dump file on standard output. Then one would simply feed |
96 | that over the network connection of one's choice to the rest |
97 | of agedu running on Unix as usual. |