(r15) FormattedSearch < TWiki

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r15 - 27 Jul 2004 - 02:42:48 - PeterThoeny? You are here: TWiki >
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---# TWiki Formatted Search Results

_Inline search feature allows flexible formatting of search result_

The =[[TWikiVariables#VarSEARCH][%<nop>SEARCH{...}%]]= variable documented in TWikiVariables has a fixed format for the search result, that is, a table consisting of topic names and topic summaries. Use the =format="..."= parameter to specify a customized format of the search result. The string of the format parameter is typically a bullet list or table row containing variables (such as =%<nop>SEARCH{ "food" format="| $topic | $summary |" }%=).

---++ Syntax

Two parameters can be used to specify a customized search result:

1. =header="..."= parameter

Use the header parameter to specify the header of a search result. It should correspond to the format of the format parameter. This parameter is optional. <br /> Example: =header="| <nop>*Topic:*<nop> | <nop>*Summary:*<nop> |"=

2. =format="..."= parameter

Use the format parameter to specify the format of one search hit.
<br /> Example: =format="| $topic | $summary |"=

Variables that can be used in the format string:

| *Name:* | *Expands To:* |
| =$web= | Name of the web |
| =$topic= | Topic name |
| =$topic(20)= | Topic name, "<tt>- </tt>" hyphenated each 20 characters |
| =$topic(30, -&lt;br /&gt;)= | Topic name, hyphenated each 30 characters with separator "<tt>-&lt;br /&gt;</tt>" |
| =$topic(40, ...)= | Topic name, shortended to 40 characters with "<tt>...</tt>" indication |
| =$parent= | Name of parent topic; empty if not set |
| =$parent(20)= | Name of parent topic, same hyphenation/shortening like =$topic()= |
| =$text= | Formatted topic text. In case of a =multiple="on"= search, it is the line found for each search hit. |
| =$locked= | LOCKED flag (if any) |
| =$date= | Time stamp of last topic update, e.g. =%GMTIME{"$day $mon $year - $hour:$min"}%= |
| =$isodate= | Time stamp of last topic update, e.g. =%GMTIME{"$year-$mo-$dayT$hour:$minZ"}%= |
| =$rev= | Number of last topic revision, e.g. =1.4= |
| =$username= | Login name of last topic update, e.g. =jsmith= |
| =$wikiname= | Wiki user name of last topic update, e.g. =<nop>JohnSmith= |
| =$wikiusername= | Wiki user name of last topic update, like =%MAINWEB%.<nop>JohnSmith= |
| =$createdate= | Time stamp of topic revision 1.1 |
| =$createusername= | Login name of topic revision 1.1, e.g. =jsmith= |
| =$createwikiname= | Wiki user name of topic revision 1.1, e.g. =<nop>JohnSmith= |
| =$createwikiusername= | Wiki user name of topic revision 1.1, e.g. =%MAINWEB%.<nop>JohnSmith= |
| =$summary= | Topic summary |
| =$formname= | The name of the form attached to the topic; empty if none |
| =$formfield(name)= | The field value of a form field; for example, =$formfield(<nop>TopicClassification)= would get expanded to =PublicFAQ=. This applies only to topics that have a [[TWikiForms][TWikiForm]] |
| =$formfield(name, 10)= | Form field value, "<tt>- </tt>" hyphenated each 10 characters |
| =$formfield(name, 20, -&lt;br /&gt;)= | Form field value, hyphenated each 20 characters with separator "<tt>-&lt;br /&gt;</tt>" |
| =$formfield(name, 30, ...)= | Form field value, shortended to 30 characters with "<tt>...</tt>" indication |
| =$pattern(reg-exp)= | A regular expression pattern to extract some text from a topic (does not search meta data; use =$formfield= instead). In case of a =multiple="on"= search, the pattern is applied to the line found in each search hit.%BB% Specify a RegularExpression that covers the whole text (topic or line), which typically starts with =.*=, and must end in =.*= %BB% Put text you want to keep in parenthesis, like =$pattern(.*?(from here.*?to here).*)= %BB% Example: =$pattern(.*?\*.*?Email\:\s*([^\n\r]+).*)= extracts the email address from a bullet of format =* Email: ...= %BB% This example has non-greedy =.*?= patterns to scan for the first occurance of the Email bullet; use greedy =.*= patterns to scan for the last occurance %BB% Limitation: Do not use =.*)= inside the pattern, e.g. =$pattern(.*foo(.*)bar.*)= does not work, but =$pattern(.*foo(.*?)bar.*)= does %BB% Note: Make sure that the integrity of a web page is not compromised; for example, if you include an HTML table make sure to include everything including the table end tag |
| =$n= or =$n()= | New line |
| =$nop= or =$nop()= | Is a "no operation". This variable gets removed; useful for nested search |
| =$quot= | Double quote (="=). Alternatively write =\"= to escape it |
| =$percnt= | Percent sign (=%=) |
| =$dollar= | Dollar sign (=$=) |


---++ Examples


#SearchBulletList
---+++ Bullet list showing topic name and summary

*Write this:*

=%<nop>SEARCH{ "FAQ" scope="topic" nosearch="on" nototal="on" header="   * <nop>*Topic: Summary:*" format="   * [<nop>[$topic]]: $summary" }%=

*To get this:*

%SEARCH{ "FAQ" scope="topic" nosearch="on" nototal="on" header="   * *Topic: Summary:*" format="   * [[$topic]]: $summary" }%


---+++ Table showing form field values of topics with a form

In a web where there is a form that contains a =Topic<nop>Classification= field, an =Operating<nop>System= field and an =Os<nop>Version= field we could write:

=| <nop>*Topic:*<nop> | <nop>*<nop>OperatingSystem:*<nop> | <nop>*<nop>OsVersion:*<nop> |= <br />
=%<nop>SEARCH{ "[T]opicClassification.*?value=\"[P]ublicFAQ\"" scope="text" regex="on" nosearch="on" nototal="on" format="| [<nop>[$topic]] | $formfield(<nop>OperatingSystem) | $formfield(<nop>OsVersion) |" }%=

To get this:

<table border="1" cellspacing="0" cellpadding="1">
<tr>
 <th bgcolor="#99CCCC"> <strong>Topic:</strong> </th>
 <th bgcolor="#99CCCC"> <strong>OperatingSystem:</strong> </th>
 <th bgcolor="#99CCCC"> <strong>OsVersion:</strong> </th></tr>
<tr>
 <td>  <a href="%SCRIPTURLPATH%/view%SCRIPTSUFFIX%/Sandbox/IncorrectDllVersionW32PTH10DLL">IncorrectDllVersionW32PTH10DLL</a>  </td><td>  <a href="%SCRIPTURLPATH%/view%SCRIPTSUFFIX%/Sandbox/OsWin">OsWin</a>  </td><td>  95/98  </td></tr>
<tr>
 <td>  <a href="%SCRIPTURLPATH%/view%SCRIPTSUFFIX%/Sandbox/WinDoze95Crash">WinDoze95Crash</a>  </td>
 <td>  <a href="%SCRIPTURLPATH%/view%SCRIPTSUFFIX%/Sandbox/OsWin">OsWin</a>  </td>
 <td>  95  </td></tr>
</table>


---+++ Extract some text from a topic using regular expression

*Write this:*

=%<nop>SEARCH{ "__Back to\:__ <nop>TWikiFAQ" scope="text" regex="on" nosearch="on" nototal="on" header="TWiki FAQs:" format="   * $pattern(.*?FAQ\:[\n\r]*([^\n\r]+).*) [<nop>[$topic][Answer...]]" }%=

*To get this:*

%SEARCH{ "__Back to\:__ TWikiFAQ" scope="text" regex="on" nosearch="on" nototal="on" header="TWiki FAQs:" format="   * $pattern(.*?FAQ\:[\n\r]*([^\n\r]+).*) [[$topic][Answer...]]" }%


---+++ Nested Search

Search can be nested. For example, search for some topics, then form a new search for each topic found in the first search. The idea is to build the nested search string using a formatted search in the first search.

Here is an example. Let's search for all topics that contain the word "culture" (first search), and let's find out where each topic found is linked from (second search).

   * First search:
      * =%<nop>SEARCH{ "culture" format="   * $topic is referenced by: (list all references)" nosearch="on" nototal="on" }%=
   * Second search. For each hit we want this search:
      * =%<nop>SEARCH{ "(topic found in first search)" format="$topic" nosearch="on" nototal="on" separator=", " }%=
   * Now let's nest the two. We need to escape the second search, e.g. the first search will build a valid second search string. Note that we escape the second search so that it does not get evaluated prematurely by the first search:
      * Use =$percnt= to escape the leading percent of the second search
      * Use =\"= to escape the double quotes
      * Use =$dollar= to escape the =$= of =$topic=
      * Use =$nop= to escape the =}%= sequence

*Write this:*

=%<nop>SEARCH{ "culture" format="   * $topic is referenced by:$n      * $percntSEARCH{ \"$topic\" format=\"$dollartopic\" nosearch=\"on\" nototal=\"on\" separator=\", \" }$nop%" nosearch="on" nototal="on" }%=

*To get this:*

%SEARCH{ "culture" format="   * $topic is referenced by:$n      * $percntSEARCH{ \"$topic\" format=\"$dollartopic\" nosearch=\"on\" nototal=\"on\" separator=\", \" }$nop%" nosearch="on" nototal="on" }%

__Note:__ Nested search can be slow, especially if you nest more then 3 times. Nesting is limited to 16 levels. For each new nesting level you need to "escape the escapes", e.g. write =$dollarpercntSEARCH{= for level three, =$dollardollarpercntSEARCH{= for level four, etc.

---+++ Most recently changed pages

*Write this:*

=%<nop>SEARCH{ "\.*" scope="topic" regex="on" nosearch="on" nototal="on" order="modified" reverse="on"  format="| [<nop>[$topic]] | $wikiusername  | $date |" limit="7" }%=

*To get this:*

%SEARCH{ "\.*" scope="topic" regex="on" nosearch="on" nototal="on" order="modified" reverse="on"  format="| [[$topic]] | $wikiusername  | $date |" limit="7" }%

---+++ Search with conditional output

A regular expression search is flexible, but there are limitations. For example, you cannot show all topics that are up to exactly one week old, or create a report that shows all records with invalid form fields or fields within a certain range, etc. You need some additional logic to format output based on a condition:
   1. Specify a search which returns more hits then you need
   1. For each search hit apply a spreadsheet formula to determine if the hit is needed
   1. If needed, format and output the result
   1. Else supress the search hit

This requires the TWiki:Plugins.SpreadSheetPlugin. The following example shows all topics that are up to exactly one week old.

*Write this:*

=%<nop>CALC{$SET(weekold, $TIMEADD($TIME(), -7, day))}%= %BR%
=%<nop>SEARCH{ "." scope="topic" regex="on" nosearch="on" nototal="on" order="modified" reverse="on" format="$percntCALC{$IF($TIME($date) &lt; $GET(weekold), &lt;nop&gt;, | [<nop>[$topic]] | $wikiusername | $date | $rev |)}$percnt" limit="100" }%=

   * The first line sets the =weekold= variable to the serialized date of exactly one week ago
   * The SEARCH has a deferred CALC. The =$percnt= makes sure that the CALC gets executed once for each search hit
   * The CALC compares the date of the topic with the =weekold= date
   * If topic is older, a =&lt;nop&gt;= is returned, which gets removed at the end of the TWiki rendering process
   * Otherwise, the search hit is formatted and returned

*To get this:*

%CALC{$SET(weekold, $TIMEADD($TIME(), -7, day))}%
%SEARCH{ "." scope="topic" regex="on" nosearch="on" nototal="on" order="modified" reverse="on" format="$percntCALC{$IF($TIME($date) < $GET(weekold), <nop>, | [[$topic]] | $wikiusername | $date | $rev |)}$percnt" limit="100" }%

---+++ Embedding search forms to return a formatted result

Use an HTML form and an embedded formatted search on the same topic. You can link them together with an =%<nop>URLPARAM{"..."}%= variable. Example:

*Write this:*

<verbatim>
<form action="%SCRIPTURLPATH%/view%SCRIPTSUFFIX%/%WEB%/%TOPIC%">
Find Topics: 
<input type="text" name="q" size="32" value="%URLPARAM{"q"}%" />
<input type="submit" value="Search" />
</form>
Result:
%SEARCH{ search="%URLPARAM{"q"}%" format="   * $web.$topic: %BR% $summary" nosearch="on" }%
</verbatim>

*To get this:*

<form action="%SCRIPTURLPATH%/view%SCRIPTSUFFIX%/%WEB%/%TOPIC%">
Find Topics: 
<input type="text" name="q" size="32" value="%URLPARAM{"q"}%" />
<input type="submit" value="Search" />
</form>
Result:
%SEARCH{ search="%URLPARAM{"q"}%" format="   * $web.$topic: %BR% $summary" nosearch="on" }%

-- TWiki:Main.PeterThoeny - 26 Jul 2004
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