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37 for notmuch@notmuchmail.org; Tue, 01 Mar 2016 19:35:21 +0100
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38 From: Eric J <eric@deptj.eu>
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39 Subject: Re: Tcl bindings for notmuch
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85 On Sun, 14 Feb 2016 13:05:28 +0100 (CET), Eric J <eric@deptj.eu> wrote:
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88 Resending with additional information:
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90 > I have been using notmuch for a while and I wanted to be able to use
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91 > notmuch queries in some Tcl stuff I have been using for a rather longer
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92 > while. I could have just called the notmuch CLI every time, but I thought
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93 > "no, it's a library, there should be bindings".
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95 > Bindings made me think of SWIG, which seems to have been tried for
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96 > notmuch in the past but abandoned. However, with some time available...
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98 > ... I can now, from Tcl, use the API functions from the library to
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99 > create a database, close and open it, add messages, tag them, run queries
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100 > and retrieve information about the results. I haven't tested every API
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101 > function yet, but I will be able to go on with my own needs at least. It
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102 > is only functions with pointer-to-pointer arguments that need special
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103 > attention, and that is all in the SWIG interface file. You can see that at
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104 > http://chiselapp.com/user/emj/repository/tclnotmuch/artifact/527aee944d?txt=1&ln=0
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105 > - its about 50 lines (plus some blanks).
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107 > That's a Fossil repository, with a home page at
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108 > http://chiselapp.com/user/emj/repository/tclnotmuch , if anyone wants
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109 > to look further. I think it may benefit from more wrapping from the Tcl
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110 > side, just for usability.
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112 > BTW, I have no idea if or how the interface file would have to be changed
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113 > for other languages.
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115 The bindings work, but for a use case where simultaneous database access
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116 from different processes is needed (e.g. processing emails as they
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117 arrive), lost updates are possible for the following Tcl versions:
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119 * 8.5.18 built with threads (not the default)
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120 * 8.6.[1-4] built with threads (default)
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122 However, the following Tcl versions do not have this problem:
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124 * 8.5.18 built without threads (default)
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125 * 8.5.19 built with or without threads
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126 * 8.6.[1-4] built without threads (not the default)
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127 * 8.6.5 built with or without threads
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129 Earlier 8.5.x are presumably the same as 8.5.18.
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131 The problems, where they exist, are due to a weird interaction between
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132 Tcl's thread implementation and Xapian's locking mechanism. The Tcl fix
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133 in 8.5.19/8.6.5 was made for reasons unrelated to Xapian locking, but
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