aboutsummaryrefslogtreecommitdiff
path: root/completions/fish/podman-remote.fish
blob: bcfacbb00a62485b21678a0c96fdbfc998aeadf4 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
# fish completion for podman-remote                        -*- shell-script -*-

function __podman_remote_debug
    set -l file "$BASH_COMP_DEBUG_FILE"
    if test -n "$file"
        echo "$argv" >> $file
    end
end

function __podman_remote_perform_completion
    __podman_remote_debug "Starting __podman_remote_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))

    __podman_remote_debug "args: $args"
    __podman_remote_debug "last arg: $lastArg"

    set -l requestComp "$args[1] __complete $args[2..-1] $lastArg"

    __podman_remote_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")

    __podman_remote_debug "Comps: $comps"
    __podman_remote_debug "DirectiveLine: $directiveLine"
    __podman_remote_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 __podman_remote_comp_results
# - Return false if file completion should be performed
function __podman_remote_prepare_completions
    __podman_remote_debug ""
    __podman_remote_debug "========= starting completion logic =========="

    # Start fresh
    set --erase __podman_remote_comp_results

    set -l results (__podman_remote_perform_completion)
    __podman_remote_debug "Completion results: $results"

    if test -z "$results"
        __podman_remote_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 __podman_remote_comp_results $results[1..-2]

    __podman_remote_debug "Completions are: $__podman_remote_comp_results"
    __podman_remote_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
        __podman_remote_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
        __podman_remote_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)

    __podman_remote_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)
        __podman_remote_debug "prefix: $prefix"

        set -l completions (string match -r -- "^$prefix.*" $__podman_remote_comp_results)
        set --global __podman_remote_comp_results $completions
        __podman_remote_debug "Filtered completions are: $__podman_remote_comp_results"

        # Important not to quote the variable for count to work
        set -l numComps (count $__podman_remote_comp_results)
        __podman_remote_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 $__podman_remote_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.
                __podman_remote_debug "Adding second completion to perform nospace directive"
                set --global __podman_remote_comp_results $split[1] $split[1].
                __podman_remote_debug "Completions are now: $__podman_remote_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
            __podman_remote_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 "podman-remote"
    # 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 "podman-remote " > /dev/null 2>&1
end

# Remove any pre-existing completions for the program since we will be handling all of them.
complete -c podman-remote -e

# The call to __podman_remote_prepare_completions will setup __podman_remote_comp_results
# which provides the program's completion choices.
complete -c podman-remote -n '__podman_remote_prepare_completions' -f -a '$__podman_remote_comp_results'


# This file is generated with "podman-remote completion"; see: podman-completion(1)