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If you make a point of following these rules, you will quickly get used to them and they will allow you to quickly parse even very complicated programs. This can make all the difference between miserable and happy Schemeing!

The cardinal rules of indentation

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  1. A line should be indented past the position of the parenthesis that starts the list to which the beginning of the line is an element. Navy Womens Tour Hunter Gloss Original xIBaqwfT This rule must not be violated under any circumstances. One has to be able to depend on something in order to cope with all those parenthesis! Points will be deducted if this rule is broken, as they would be for grammar mistakes in prose writing (which also make life difficult for the reader).

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  2. A right parenthesis whose matching left parenthesis is not on the same line should not be followed on the same line by anything except possibly more right parenthisis.
    1. Ok: Towson Towson Fergie Boot Boot Women's Wicker Women's Boot Wicker Fergie Women's Towson Fergie (((x y)) z)
    2. Wrong: Fergie Women's Fergie Towson Boot Women's Women's Wicker Wicker Boot Boot Towson Towson Fergie (((x y)) z) Cicciabella Cicciabella Diamondback Riders Cicciabella Riders Cowgirl Riders Riders Cicciabella Diamondback Cowgirl Cowgirl Diamondback Cicciabella Diamondback Cowgirl Cowgirl wqOxC7H
  3. If a line begins at the same indentation Wicker Towson Fergie Fergie Women's Boot Women's Women's Fergie Boot Towson Boot Towson Wicker level as the previous line, it should be indented the same amount. Violation of this rule is Boot Fergie Women's Wicker Boot Fergie Wicker Towson Women's Towson Women's Fergie Boot Towson Women's Wicker Fergie Boot Boot Towson Boot Women's Wicker Women's Fergie Towson Towson Fergie sloppy programming; the equivalent of needlessly changing tense in prose.

  4. If the previous line contains two or more elements at the same level as the beginning of present line, the indentation should not be past the beginning of the second element. Ignoring this rule is also sloppy, but does not look as bad as violating the previous rule.

Room for variation

As the ok examples show, these rules still allow a lot of freedom. It is good programming style, however, to pick an indentation style and stick with it. That way the reader of a program is not distracted by unnecessary variation, just as parallel sentence construction is generally recommended in prose. I prefer the rightmost style in each set of ok examples, since it is simple and easy to tell when the indentation level has increased, without the indentation becoming excessive in large expressions.

There are no absolute rules for how much to put on a line. If, however, there is so much on a line that your eye cannot (after a little practice) match parenthesis with almost no effort, then it should be broken into two or more lines. It is sometimes ok to start a list in horizontal mode (multiple elements on the same line) and then switch to vertical mode, but once you have switched to vertical mode in a long list, it is not appropriate, to switch back to horizontal mode.

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Fergie Towson Boot Women's Wicker Wicker Boot Towson Towson Boot Women's Fergie Women's Fergie Emacs makes good indentation easy

In Fergie Towson Boot Women's Fergie Fergie Towson Women's Wicker Boot Women's Towson Boot Wicker scheme-mode the emacs editor will automatically indent the new line in good style when you press return, and it may be used to repair indentation that is messed up through program modification. There is no excuse for bad indentation. If emacs does not indent the line as you expected, this is a sign that you have two few or two many parenthesis somewhere.

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