// Copyright 2013-2022 The Cobra Authors // // Licensed under the Apache License, Version 2.0 (the "License"); // you may not use this file except in compliance with the License. // You may obtain a copy of the License at // // http://www.apache.org/licenses/LICENSE-2.0 // // Unless required by applicable law or agreed to in writing, software // distributed under the License is distributed on an "AS IS" BASIS, // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. // See the License for the specific language governing permissions and // limitations under the License. package cobra import ( "bytes" "fmt" "io" "os" "strings" ) func genFishComp(buf io.StringWriter, name string, includeDesc bool) { // Variables should not contain a '-' or ':' character nameForVar := name nameForVar = strings.ReplaceAll(nameForVar, "-", "_") nameForVar = strings.ReplaceAll(nameForVar, ":", "_") compCmd := ShellCompRequestCmd if !includeDesc { compCmd = ShellCompNoDescRequestCmd } WriteStringAndCheck(buf, fmt.Sprintf("# fish completion for %-36s -*- shell-script -*-\n", name)) WriteStringAndCheck(buf, fmt.Sprintf(` function __%[1]s_debug set -l file "$BASH_COMP_DEBUG_FILE" if test -n "$file" echo "$argv" >> $file end end function __%[1]s_perform_completion __%[1]s_debug "Starting __%[1]s_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)) __%[1]s_debug "args: $args" __%[1]s_debug "last arg: $lastArg" # Disable ActiveHelp which is not supported for fish shell set -l requestComp "%[9]s=0 $args[1] %[3]s $args[2..-1] $lastArg" __%[1]s_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") __%[1]s_debug "Comps: $comps" __%[1]s_debug "DirectiveLine: $directiveLine" __%[1]s_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 __%[1]s_comp_results # - Return false if file completion should be performed function __%[1]s_prepare_completions __%[1]s_debug "" __%[1]s_debug "========= starting completion logic ==========" # Start fresh set --erase __%[1]s_comp_results set -l results (__%[1]s_perform_completion) __%[1]s_debug "Completion results: $results" if test -z "$results" __%[1]s_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 __%[1]s_comp_results $results[1..-2] __%[1]s_debug "Completions are: $__%[1]s_comp_results" __%[1]s_debug "Directive is: $directive" set -l shellCompDirectiveError %[4]d set -l shellCompDirectiveNoSpace %[5]d set -l shellCompDirectiveNoFileComp %[6]d set -l shellCompDirectiveFilterFileExt %[7]d set -l shellCompDirectiveFilterDirs %[8]d if test -z "$directive" set directive 0 end set -l compErr (math (math --scale 0 $directive / $shellCompDirectiveError) %% 2) if test $compErr -eq 1 __%[1]s_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 __%[1]s_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) __%[1]s_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) __%[1]s_debug "prefix: $prefix" set -l completions (string match -r -- "^$prefix.*" $__%[1]s_comp_results) set --global __%[1]s_comp_results $completions __%[1]s_debug "Filtered completions are: $__%[1]s_comp_results" # Important not to quote the variable for count to work set -l numComps (count $__%[1]s_comp_results) __%[1]s_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 $__%[1]s_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. __%[1]s_debug "Adding second completion to perform nospace directive" set --global __%[1]s_comp_results $split[1] $split[1]. __%[1]s_debug "Completions are now: $__%[1]s_comp_results" end end if test $numComps -eq 0; and test $nofiles -eq 0 # To be consistent with bash and zsh, we only trigger file # completion when there are no other completions __%[1]s_debug "Requesting file completion" return 1 end end return 0 end # Since Fish completions are only loaded once the user triggers them, we trigger them ourselves # so we can properly delete any completions provided by another script. # Only do this if the program can be found, or else fish may print some errors; besides, # the existing completions will only be loaded if the program can be found. if type -q "%[2]s" # The space after the program name is essential to trigger completion for the program # and not completion of the program name itself. # Also, we use '> /dev/null 2>&1' since '&>' is not supported in older versions of fish. complete --do-complete "%[2]s " > /dev/null 2>&1 end # Remove any pre-existing completions for the program since we will be handling all of them. complete -c %[2]s -e # The call to __%[1]s_prepare_completions will setup __%[1]s_comp_results # which provides the program's completion choices. complete -c %[2]s -n '__%[1]s_prepare_completions' -f -a '$__%[1]s_comp_results' `, nameForVar, name, compCmd, ShellCompDirectiveError, ShellCompDirectiveNoSpace, ShellCompDirectiveNoFileComp, ShellCompDirectiveFilterFileExt, ShellCompDirectiveFilterDirs, activeHelpEnvVar(name))) } // GenFishCompletion generates fish completion file and writes to the passed writer. func (c *Command) GenFishCompletion(w io.Writer, includeDesc bool) error { buf := new(bytes.Buffer) genFishComp(buf, c.Name(), includeDesc) _, err := buf.WriteTo(w) return err } // GenFishCompletionFile generates fish completion file. func (c *Command) GenFishCompletionFile(filename string, includeDesc bool) error { outFile, err := os.Create(filename) if err != nil { return err } defer outFile.Close() return c.GenFishCompletion(outFile, includeDesc) }