feat(completions): add Bash and fish

These completions only apply to the command `remarshal`,
not `foo2bar` short commands.

completions/install.fish

@@ -0,0 +1,10 @@
+#! /usr/bin/env fish
+
+cd "$(path dirname "$(status filename)")"
+
+set --local src remarshal.fish
+set --local dst $__fish_config_dir/completions/
+
+printf 'copying "%s" to "%s"\n' $src $dst
+
+cp $src $dst

completions/remarshal.bash

@@ -0,0 +1,41 @@
+_remarshal() {
+    local cur prev opts formats input_formats output_formats
+
+    COMPREPLY=()
+    cur=${COMP_WORDS[COMP_CWORD]}
+    prev=${COMP_WORDS[COMP_CWORD - 1]}
+
+    formats='cbor json msgpack toml yaml'
+    input_formats=$formats
+    output_formats="$formats python"
+
+    opts='--help --version --from --if --input-format --input --indent --stringify --max-values --output --sort-keys --to --of --output-format --unwrap --verbose --width --wrap --yaml-style'
+
+    case "${prev}" in
+    --from | --if | --input-format | -f)
+        COMPREPLY=($(compgen -W "${input_formats}" -- ${cur}))
+        return 0
+        ;;
+    --to | --of | --output-format | -t)
+        COMPREPLY=($(compgen -W "${output_formats}" -- ${cur}))
+        return 0
+        ;;
+    --yaml-style)
+        COMPREPLY=($(compgen -W '\" '"\\' '|' '>'" -- ${cur}))
+        return 0
+        ;;
+    --input | -i | --output | -o)
+        COMPREPLY=($(compgen -f -- ${cur}))
+        return 0
+        ;;
+    *)
+        if [[ ${cur} == -* ]]; then
+            COMPREPLY=($(compgen -W "${opts}" -- ${cur}))
+        else
+            COMPREPLY=($(compgen -f -- ${cur}))
+        fi
+        ;;
+    esac
+}
+
+complete -F _remarshal remarshal

completions/remarshal.fish

@@ -0,0 +1,20 @@
+complete -c remarshal -s h -l help -d "Show help message and exit"
+complete -c remarshal -s v -l version -d "Show program's version number and exit"
+
+complete -c remarshal -s f -l from -l if -l input-format -x -a "cbor json msgpack toml yaml" -d "Input format"
+
+complete -c remarshal -s i -l input -r -d "Input file"
+complete -c remarshal -s o -l output -r -d "Output file"
+
+complete -c remarshal -s t -l to -l of -l output-format -x -a "cbor json msgpack python toml yaml" -d "Output format"
+
+complete -c remarshal -l indent -x -d "JSON and YAML indentation"
+complete -c remarshal -s k -l stringify -d "Turn special values into strings"
+complete -c remarshal -l max-values -x -d "Maximum number of values in input data"
+complete -c remarshal -s s -l sort-keys -d "Sort JSON, Python, and TOML keys"
+complete -c remarshal -l width -x -d "Python and YAML line width"
+complete -c remarshal -l yaml-style -x -a '"\'" "\\"" "|" ">"' -d "YAML formatting style"
+
+complete -c remarshal -l unwrap -x -d "Only output data under given key"
+complete -c remarshal -l verbose -d "Print debug information on error"
+complete -c remarshal -l wrap -x -d "Wrap data in a map with given key"