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