208 lines
7.4 KiB
Go
208 lines
7.4 KiB
Go
package cobra
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import (
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"bytes"
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"fmt"
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"io"
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"os"
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"strings"
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)
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func genFishComp(buf *bytes.Buffer, name string, includeDesc bool) {
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// Variables should not contain a '-' or ':' character
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nameForVar := name
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nameForVar = strings.Replace(nameForVar, "-", "_", -1)
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nameForVar = strings.Replace(nameForVar, ":", "_", -1)
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compCmd := ShellCompRequestCmd
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if !includeDesc {
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compCmd = ShellCompNoDescRequestCmd
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}
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buf.WriteString(fmt.Sprintf("# fish completion for %-36s -*- shell-script -*-\n", name))
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buf.WriteString(fmt.Sprintf(`
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function __%[1]s_debug
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set 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 __%[1]s_perform_completion
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__%[1]s_debug "Starting __%[1]s_perform_completion with: $argv"
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set args (string split -- " " "$argv")
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set lastArg "$args[-1]"
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__%[1]s_debug "args: $args"
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__%[1]s_debug "last arg: $lastArg"
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set emptyArg ""
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if test -z "$lastArg"
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__%[1]s_debug "Setting emptyArg"
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set emptyArg \"\"
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end
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__%[1]s_debug "emptyArg: $emptyArg"
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if not type -q "$args[1]"
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# This can happen when "complete --do-complete %[2]s" is called when running this script.
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__%[1]s_debug "Cannot find $args[1]. No completions."
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return
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end
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set requestComp "$args[1] %[3]s $args[2..-1] $emptyArg"
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__%[1]s_debug "Calling $requestComp"
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set results (eval $requestComp 2> /dev/null)
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set comps $results[1..-2]
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set directiveLine $results[-1]
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# For Fish, when completing a flag with an = (e.g., <program> -n=<TAB>)
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# completions must be prefixed with the flag
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set flagPrefix (string match -r -- '-.*=' "$lastArg")
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__%[1]s_debug "Comps: $comps"
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__%[1]s_debug "DirectiveLine: $directiveLine"
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__%[1]s_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 does three things:
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# 1- Obtain the completions and store them in the global __%[1]s_comp_results
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# 2- Set the __%[1]s_comp_do_file_comp flag if file completion should be performed
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# and unset it otherwise
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# 3- Return true if the completion results are not empty
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function __%[1]s_prepare_completions
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# Start fresh
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set --erase __%[1]s_comp_do_file_comp
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set --erase __%[1]s_comp_results
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# Check if the command-line is already provided. This is useful for testing.
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if not set --query __%[1]s_comp_commandLine
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# Use the -c flag to allow for completion in the middle of the line
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set __%[1]s_comp_commandLine (commandline -c)
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end
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__%[1]s_debug "commandLine is: $__%[1]s_comp_commandLine"
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set results (__%[1]s_perform_completion "$__%[1]s_comp_commandLine")
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set --erase __%[1]s_comp_commandLine
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__%[1]s_debug "Completion results: $results"
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if test -z "$results"
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__%[1]s_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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set --global __%[1]s_comp_do_file_comp 1
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return 1
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end
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set directive (string sub --start 2 $results[-1])
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set --global __%[1]s_comp_results $results[1..-2]
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__%[1]s_debug "Completions are: $__%[1]s_comp_results"
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__%[1]s_debug "Directive is: $directive"
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set shellCompDirectiveError %[4]d
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set shellCompDirectiveNoSpace %[5]d
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set shellCompDirectiveNoFileComp %[6]d
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set shellCompDirectiveFilterFileExt %[7]d
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set shellCompDirectiveFilterDirs %[8]d
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if test -z "$directive"
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set directive 0
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end
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set compErr (math (math --scale 0 $directive / $shellCompDirectiveError) %% 2)
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if test $compErr -eq 1
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__%[1]s_debug "Received error directive: aborting."
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# Might as well do file completion, in case it helps
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set --global __%[1]s_comp_do_file_comp 1
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return 1
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end
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set filefilter (math (math --scale 0 $directive / $shellCompDirectiveFilterFileExt) %% 2)
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set 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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__%[1]s_debug "File extension filtering or directory filtering not supported"
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# Do full file completion instead
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set --global __%[1]s_comp_do_file_comp 1
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return 1
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end
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set nospace (math (math --scale 0 $directive / $shellCompDirectiveNoSpace) %% 2)
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set nofiles (math (math --scale 0 $directive / $shellCompDirectiveNoFileComp) %% 2)
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__%[1]s_debug "nospace: $nospace, nofiles: $nofiles"
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# Important not to quote the variable for count to work
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set numComps (count $__%[1]s_comp_results)
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__%[1]s_debug "numComps: $numComps"
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if test $numComps -eq 1; and test $nospace -ne 0
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# To support the "nospace" directive we trick the shell
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# by outputting an extra, longer completion.
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__%[1]s_debug "Adding second completion to perform nospace directive"
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set --append __%[1]s_comp_results $__%[1]s_comp_results[1].
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end
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if test $numComps -eq 0; and test $nofiles -eq 0
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__%[1]s_debug "Requesting file completion"
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set --global __%[1]s_comp_do_file_comp 1
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end
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# If we don't want file completion, we must return true even if there
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# are no completions found. This is because fish will perform the last
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# completion command, even if its condition is false, if no other
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# completion command was triggered
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return (not set --query __%[1]s_comp_do_file_comp)
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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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# The space after the 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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complete --do-complete "%[2]s " > /dev/null 2>&1
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# Using '> /dev/null 2>&1' since '&>' is not supported in older versions of fish.
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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 %[2]s -e
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# The order in which the below two lines are defined is very important so that __%[1]s_prepare_completions
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# is called first. It is __%[1]s_prepare_completions that sets up the __%[1]s_comp_do_file_comp variable.
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#
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# This completion will be run second as complete commands are added FILO.
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# It triggers file completion choices when __%[1]s_comp_do_file_comp is set.
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complete -c %[2]s -n 'set --query __%[1]s_comp_do_file_comp'
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# This completion will be run first as complete commands are added FILO.
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# The call to __%[1]s_prepare_completions will setup both __%[1]s_comp_results and __%[1]s_comp_do_file_comp.
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# It provides the program's completion choices.
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complete -c %[2]s -n '__%[1]s_prepare_completions' -f -a '$__%[1]s_comp_results'
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`, nameForVar, name, compCmd,
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ShellCompDirectiveError, ShellCompDirectiveNoSpace, ShellCompDirectiveNoFileComp,
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ShellCompDirectiveFilterFileExt, ShellCompDirectiveFilterDirs))
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}
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// GenFishCompletion generates fish completion file and writes to the passed writer.
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func (c *Command) GenFishCompletion(w io.Writer, includeDesc bool) error {
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buf := new(bytes.Buffer)
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genFishComp(buf, c.Name(), includeDesc)
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_, err := buf.WriteTo(w)
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return err
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}
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// GenFishCompletionFile generates fish completion file.
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func (c *Command) GenFishCompletionFile(filename string, includeDesc bool) error {
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outFile, err := os.Create(filename)
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if err != nil {
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return err
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}
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defer outFile.Close()
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return c.GenFishCompletion(outFile, includeDesc)
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}
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