forked from TrueCloudLab/restic
235 lines
9.5 KiB
Fish
235 lines
9.5 KiB
Fish
# fish completion for restic -*- shell-script -*-
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function __restic_debug
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set -l file "$BASH_COMP_DEBUG_FILE"
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if test -n "$file"
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echo "$argv" >> $file
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end
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end
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function __restic_perform_completion
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__restic_debug "Starting __restic_perform_completion"
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# Extract all args except the last one
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set -l args (commandline -opc)
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# Extract the last arg and escape it in case it is a space
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set -l lastArg (string escape -- (commandline -ct))
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__restic_debug "args: $args"
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__restic_debug "last arg: $lastArg"
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# Disable ActiveHelp which is not supported for fish shell
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set -l requestComp "RESTIC_ACTIVE_HELP=0 $args[1] __complete $args[2..-1] $lastArg"
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__restic_debug "Calling $requestComp"
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set -l results (eval $requestComp 2> /dev/null)
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# Some programs may output extra empty lines after the directive.
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# Let's ignore them or else it will break completion.
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# Ref: https://github.com/spf13/cobra/issues/1279
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for line in $results[-1..1]
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if test (string trim -- $line) = ""
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# Found an empty line, remove it
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set results $results[1..-2]
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else
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# Found non-empty line, we have our proper output
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break
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end
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end
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set -l comps $results[1..-2]
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set -l directiveLine $results[-1]
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# For Fish, when completing a flag with an = (e.g., <program> -n=<TAB>)
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# completions must be prefixed with the flag
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set -l flagPrefix (string match -r -- '-.*=' "$lastArg")
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__restic_debug "Comps: $comps"
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__restic_debug "DirectiveLine: $directiveLine"
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__restic_debug "flagPrefix: $flagPrefix"
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for comp in $comps
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printf "%s%s\n" "$flagPrefix" "$comp"
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end
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printf "%s\n" "$directiveLine"
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end
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# this function limits calls to __restic_perform_completion, by caching the result behind $__restic_perform_completion_once_result
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function __restic_perform_completion_once
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__restic_debug "Starting __restic_perform_completion_once"
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if test -n "$__restic_perform_completion_once_result"
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__restic_debug "Seems like a valid result already exists, skipping __restic_perform_completion"
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return 0
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end
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set --global __restic_perform_completion_once_result (__restic_perform_completion)
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if test -z "$__restic_perform_completion_once_result"
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__restic_debug "No completions, probably due to a failure"
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return 1
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end
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__restic_debug "Performed completions and set __restic_perform_completion_once_result"
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return 0
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end
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# this function is used to clear the $__restic_perform_completion_once_result variable after completions are run
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function __restic_clear_perform_completion_once_result
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__restic_debug ""
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__restic_debug "========= clearing previously set __restic_perform_completion_once_result variable =========="
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set --erase __restic_perform_completion_once_result
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__restic_debug "Succesfully erased the variable __restic_perform_completion_once_result"
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end
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function __restic_requires_order_preservation
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__restic_debug ""
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__restic_debug "========= checking if order preservation is required =========="
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__restic_perform_completion_once
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if test -z "$__restic_perform_completion_once_result"
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__restic_debug "Error determining if order preservation is required"
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return 1
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end
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set -l directive (string sub --start 2 $__restic_perform_completion_once_result[-1])
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__restic_debug "Directive is: $directive"
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set -l shellCompDirectiveKeepOrder 32
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set -l keeporder (math (math --scale 0 $directive / $shellCompDirectiveKeepOrder) % 2)
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__restic_debug "Keeporder is: $keeporder"
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if test $keeporder -ne 0
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__restic_debug "This does require order preservation"
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return 0
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end
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__restic_debug "This doesn't require order preservation"
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return 1
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end
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# This function does two things:
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# - Obtain the completions and store them in the global __restic_comp_results
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# - Return false if file completion should be performed
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function __restic_prepare_completions
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__restic_debug ""
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__restic_debug "========= starting completion logic =========="
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# Start fresh
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set --erase __restic_comp_results
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__restic_perform_completion_once
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__restic_debug "Completion results: $__restic_perform_completion_once_result"
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if test -z "$__restic_perform_completion_once_result"
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__restic_debug "No completion, probably due to a failure"
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# Might as well do file completion, in case it helps
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return 1
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end
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set -l directive (string sub --start 2 $__restic_perform_completion_once_result[-1])
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set --global __restic_comp_results $__restic_perform_completion_once_result[1..-2]
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__restic_debug "Completions are: $__restic_comp_results"
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__restic_debug "Directive is: $directive"
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set -l shellCompDirectiveError 1
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set -l shellCompDirectiveNoSpace 2
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set -l shellCompDirectiveNoFileComp 4
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set -l shellCompDirectiveFilterFileExt 8
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set -l shellCompDirectiveFilterDirs 16
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if test -z "$directive"
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set directive 0
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end
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set -l compErr (math (math --scale 0 $directive / $shellCompDirectiveError) % 2)
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if test $compErr -eq 1
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__restic_debug "Received error directive: aborting."
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# Might as well do file completion, in case it helps
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return 1
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end
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set -l filefilter (math (math --scale 0 $directive / $shellCompDirectiveFilterFileExt) % 2)
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set -l dirfilter (math (math --scale 0 $directive / $shellCompDirectiveFilterDirs) % 2)
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if test $filefilter -eq 1; or test $dirfilter -eq 1
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__restic_debug "File extension filtering or directory filtering not supported"
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# Do full file completion instead
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return 1
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end
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set -l nospace (math (math --scale 0 $directive / $shellCompDirectiveNoSpace) % 2)
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set -l nofiles (math (math --scale 0 $directive / $shellCompDirectiveNoFileComp) % 2)
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__restic_debug "nospace: $nospace, nofiles: $nofiles"
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# If we want to prevent a space, or if file completion is NOT disabled,
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# we need to count the number of valid completions.
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# To do so, we will filter on prefix as the completions we have received
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# may not already be filtered so as to allow fish to match on different
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# criteria than the prefix.
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if test $nospace -ne 0; or test $nofiles -eq 0
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set -l prefix (commandline -t | string escape --style=regex)
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__restic_debug "prefix: $prefix"
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set -l completions (string match -r -- "^$prefix.*" $__restic_comp_results)
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set --global __restic_comp_results $completions
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__restic_debug "Filtered completions are: $__restic_comp_results"
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# Important not to quote the variable for count to work
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set -l numComps (count $__restic_comp_results)
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__restic_debug "numComps: $numComps"
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if test $numComps -eq 1; and test $nospace -ne 0
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# We must first split on \t to get rid of the descriptions to be
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# able to check what the actual completion will be.
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# We don't need descriptions anyway since there is only a single
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# real completion which the shell will expand immediately.
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set -l split (string split --max 1 \t $__restic_comp_results[1])
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# Fish won't add a space if the completion ends with any
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# of the following characters: @=/:.,
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set -l lastChar (string sub -s -1 -- $split)
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if not string match -r -q "[@=/:.,]" -- "$lastChar"
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# In other cases, to support the "nospace" directive we trick the shell
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# by outputting an extra, longer completion.
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__restic_debug "Adding second completion to perform nospace directive"
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set --global __restic_comp_results $split[1] $split[1].
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__restic_debug "Completions are now: $__restic_comp_results"
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end
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end
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if test $numComps -eq 0; and test $nofiles -eq 0
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# To be consistent with bash and zsh, we only trigger file
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# completion when there are no other completions
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__restic_debug "Requesting file completion"
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return 1
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end
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end
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return 0
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end
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# Since Fish completions are only loaded once the user triggers them, we trigger them ourselves
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# so we can properly delete any completions provided by another script.
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# Only do this if the program can be found, or else fish may print some errors; besides,
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# the existing completions will only be loaded if the program can be found.
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if type -q "restic"
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# The space after the program name is essential to trigger completion for the program
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# and not completion of the program name itself.
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# Also, we use '> /dev/null 2>&1' since '&>' is not supported in older versions of fish.
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complete --do-complete "restic " > /dev/null 2>&1
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end
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# Remove any pre-existing completions for the program since we will be handling all of them.
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complete -c restic -e
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# this will get called after the two calls below and clear the $__restic_perform_completion_once_result global
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complete -c restic -n '__restic_clear_perform_completion_once_result'
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# The call to __restic_prepare_completions will setup __restic_comp_results
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# which provides the program's completion choices.
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# If this doesn't require order preservation, we don't use the -k flag
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complete -c restic -n 'not __restic_requires_order_preservation && __restic_prepare_completions' -f -a '$__restic_comp_results'
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# otherwise we use the -k flag
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complete -k -c restic -n '__restic_requires_order_preservation && __restic_prepare_completions' -f -a '$__restic_comp_results'
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