Tip: Populate a custom column with text file content

[highend]

Let's assume you have a (txt) file with file names and some kind of description for each of it's entries
and you want to populate a custom column with the descriptions...

Like:

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E:\2015_1231_00_50_13_354.png|Anna
E:\2016_0102_16_33_22_124.png|Jamie
E:\2016_0103_00_58_57_317.png|Irina
E:\2016_0105_21_12_17_466.png|Hanna v2
E:\2016_0106_06_16_11_884.png|Miami

Normally you'd parse this file for each single entry in the list pane with a custom column script so with each additional file
the time to display everything rises.

Just a short tip to speed up the whole thing:

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    perm $P_ColumnContent;
    if !($P_ColumnContent) { $P_ColumnContent = readfile("the full path to the file that contains the content.txt"); }
    $index = gettokenindex(<cc_item>, regexreplace($P_ColumnContent, "\|.*?(?=$)"), <crlf>, "i");
    return gettoken(gettoken($P_ColumnContent, $index, <crlf>), 2, "|");

This custom column script reads the file only once, populates a permanent variable with it and from then on each other
column entry parses only the variable's content.

For gaining the boost you have to pay a small price: If you want to reread everything because you modified
the text file you need a short script:

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    perm $P_ColumnContent = "";
    #485; // Refresh list