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129 lines
3.9 KiB
Plaintext
129 lines
3.9 KiB
Plaintext
Style guidelines
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===============
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Indentation
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-----------
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Code must be indented using hard tabs.
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Naming
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------
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Short version: $GLOBAL, $local, func_name()
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Variables must be declared and scoped.
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GLOBAL_VARIABLES # are uppercase unless there's a good reason not to.
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# (e.g., path as a special meaning in Zsh)
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local samplevar # are lowercase and scoped to the function # name
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# should be readable. Do not make unnecessary
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# shortcuts that would impede others to read fluidly
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# Please comment your functions before coding them: it helps
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# clear the mind on the objective. If it does too much, you
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# probably want to split it. Any reusable code should be
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# isolated.
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any_function() {}
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_internals() {} # Prepend an _ if the function is clearly internal,
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# that is, if it's only called within the scope of
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# another function.
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Sample code:
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# Sample public command.
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#
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# It shows developers how to write readable code.
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# Returns 0 on success, or fails
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public_command() {
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local tombpath="$1" # First argument is the path to the tomb
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local orientation="${2:-South}" # Second optional argument
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local something is happening
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[[ -z $tombpath ]] && {
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_failure "Usage public_command tombpath [orientation=South]" }
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case $orientation in
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(South|North|East|West) break;;
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(*)
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_failure "orientation must be one of South, North, East, or West."
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;;
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esac
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_check_swap # Ensure the available memory is safe
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_plot $tombpath # Set TOMB{PATH,DIR,FILE,NAME}
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for is in $TOMBLOOPDEVS; do
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[[ -k $is ]] && {
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happening+="$is "
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} || {
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something+="$is "
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}
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done
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_message "You gotta sort your bones."
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return 0
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}
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Reporting to the user
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---------------------
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There are some nifty messaging functions to use. They all come with
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shortcuts that you can use during development or for temporary
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messages. The long name is to be used for translatable strings.
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They display formatted messages, using colors when available.
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DEBUG=1 make the _verbose messages visible.
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QUIET=1 suppresses all messages (but the _verbose messages if DEBUG=1).
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Here is the deal:
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Name (Shortcut) Return When to use
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=================================================================================
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_verbose (xxx) You need to check the current state of the program.
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_message (say) You want to tell the user about what's going on.
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You can pass -n (shortcut: act) for inline messages.
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_warning (no) You want to inform the user about an error condition.
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_success (yes) You want to tell the user about a successful result.
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_failure (die) exit 1 You want to exit the program with a fatal error.
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You may pass a different exit code as exitval.
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All messaging function take a single "message" argument.
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_failure takes an exit code as an optional exitval environment variable.
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Additionally you can use _print to pass translatable string without decoration.
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Examples:
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_verbose "Showing translatable debug message"
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xxx "This is temporary debug"
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_message "The program is doing something"
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_message -n "Inline messages "
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echo "are useful"
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_success "All is fine"
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_warning "Something's wrong"
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_print "Did I really say that?"
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_failure "Fatal error: exiting with default exit code 1"
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_message "This is not reached, nor the next 'die' command"
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exitval=127 die "I am Jack's dead corpse."
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Will display something like:
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tomb [D] Showing translatable debug message
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tomb [D] This is temporary debug
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tomb . The program is doing something
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tomb > Inline messages are useful
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tomb (*) All is fine
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tomb [W] Something's wrong
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Did I really say that?
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tomb [E] Fatal error: exiting with default exit code 1
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