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diff --git a/doc/plugins/pedigree.mdwn b/doc/plugins/pedigree.mdwn new file mode 100644 index 000000000..41f70745c --- /dev/null +++ b/doc/plugins/pedigree.mdwn @@ -0,0 +1,145 @@ +[[!template id=plugin name=pedigree author="intrigeri"]] +[[!tag type/useful]] + +This plugin provides a bunch of loops that one can use in his/her +`HTML::Template`'s to iterate over all or a subset of a page's +parents. One can think of pedigree as "`PARENTLINKS` on steroids". + +[[!toc ]] + +Content +======= + +Loop variables +-------------- + +Inside any loop provided by the pedigree plugin, every path element +has not only the `URL` and `PAGE` variables, as with `PARENTLINKS`, +but also the following ones: + +* `ABSDEPTH` (positive integer): depth of the path leading to the + current path element, counting from the wiki's root, which has + `ABSDEPTH=0` +* `DISTANCE` (positive integer): distance, expressed in path elements, + from the current page to the current path element; e.g. this is + 1 for the current page's mother, 2 for its grand-mother, etc. +* `IS_ROOT` (boolean): true if, and only if, this path element is the + wiki's root +* `IS_SECOND_ANCESTOR` (boolean): true if, and only if, this path + element is the first one after the wiki's root, on the path leading + to the current page +* `IS_GRAND_MOTHER` (boolean): true if, and only if, this path element + is the current page's grand-mother +* `IS_MOTHER` (boolean): true if, and only if, this path element + is the current page's mother + +Loops +----- + +### `PEDIGREE` + +Returns the same parents list as `PARENTLINKS` would, along with +additional loop variables as explained above. + +### `PEDIGREE_BUT_ROOT` + +Returns the same parents list as `PEDIGREE` would, **but** the wiki +root (i.e. homepage). + +In addition to pedigree's common loop variables, `PEDIGREE_BUT_ROOT` +provides `RELDEPTH` (positive integer), whose value, for a given +parent, is its relative depth, i.e. the depth of the path leading to +it, counting from the first element returned by this loop. + +### `PEDIGREE_BUT_TWO_OLDEST` + +Returns the same parents list as `PEDIGREE` would, **but** the wiki +root (i.e. homepage) and the next path component. + +In addition to pedigree's common loop variables, +`PEDIGREE_BUT_TWO_OLDEST` provides `RELDEPTH`: depth of the path +leading to the current parent, relative to the first element returned +by this loop. + +Usage +===== + +Styling parents depending on their depth +---------------------------------------- + +Say you want the parent links to be styled depending on their depth in +the path leading to the current page; just add the following lines in +`page.tmpl`: + + <TMPL_LOOP NAME="PEDIGREE"> + <a href="<TMPL_VAR NAME="URL">" class="parentdepth<TMPL_VAR NAME="ABSDEPTH">"> + <TMPL_VAR NAME="PAGE"> + </a> / + </TMPL_LOOP> + +Then write the appropriate CSS bits for `a.parentdepth1`, etc. + +Skip some parents, style the others depending on their distance +--------------------------------------------------------------- + +Say you want to display the parents links, skipping the wiki homepage, +styled depending on their distance from the current page; just add the +following lines in `page.tmpl`: + + <TMPL_LOOP NAME="PEDIGREE_BUT_ROOT"> + <a href="<TMPL_VAR NAME="URL">" class="parentdistance<TMPL_VAR NAME="DISTANCE">"> + <TMPL_VAR NAME="PAGE"> + </a> / + </TMPL_LOOP> + +Then write the appropriate CSS bits for `a.parentdistance1`, etc. + +Full-blown example +------------------ + +Let's have a look at a more complicated example; combining the boolean +loop variables provided by this plugin (`IS_ROOT` and friends) and +`HTML::Template` flow control structures, you can have custom HTML +and/or CSS generated for some special path components; e.g.: + + <!-- all parents, skipping mother and grand'ma, inside a common div+ul --> + <div id="oldestparents"> + <ul> + <TMPL_LOOP NAME="PEDIGREE"> + <TMPL_IF NAME="IS_GRAND_MOTHER"> + <TMPL_ELSE> + <TMPL_IF NAME="IS_MOTHER"> + <TMPL_ELSE> + <li><a href="<TMPL_VAR NAME="URL">"><TMPL_VAR NAME="PAGE"></a></li> + </TMPL_IF> + </TMPL_IF> + </TMPL_LOOP> + </ul> + </div> + + <!-- dedicated div's for mother and grand'ma --> + <TMPL_LOOP NAME="PEDIGREE"> + <TMPL_IF NAME="IS_GRAND_MOTHER"> + <div id="grandma"> + <a href="<TMPL_VAR NAME="URL">"><TMPL_VAR NAME="PAGE"></a> + </div> + <TMPL_ELSE> + <TMPL_IF NAME="IS_MOTHER"> + <div id="mother"> + <a href="<TMPL_VAR NAME="URL">"><TMPL_VAR NAME="PAGE"></a> + </div> + </TMPL_IF> + </TMPL_IF> + </TMPL_LOOP> + + <!-- eventually, the current page title --> + <TMPL_VAR NAME="TITLE"> + </div> + +Known bugs +========== + +If `PEDIGREE_BUT_ROOT` and `PEDIGREE_BUT_TWO_OLDEST` are used in the +same `HTML::Template`, `RELDEPTH` has wrong values inside the +`PEDIGREE_BUT_ROOT` loop. This can be fixed if anyone needs this to +be working. |