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Added a nice bash completion for all of our alises
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#!/bin/bash | ||
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# Some shortcuts for bash completion on all current functions and aliases | ||
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# https://superuser.com/questions/436314/how-can-i-get-bash-to-perform-tab-completion-for-my-aliases | ||
# Automatically add completion for all aliases to commands having completion functions | ||
function alias_completion { | ||
local namespace="alias_completion" | ||
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# parse function based completion definitions, where capture group 2 => function and 3 => trigger | ||
local compl_regex='complete( +[^ ]+)* -F ([^ ]+) ("[^"]+"|[^ ]+)' | ||
# parse alias definitions, where capture group 1 => trigger, 2 => command, 3 => command arguments | ||
local alias_regex="alias ([^=]+)='(\"[^\"]+\"|[^ ]+)(( +[^ ]+)*)'" | ||
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# create array of function completion triggers, keeping multi-word triggers together | ||
eval "local completions=($(complete -p | sed -Ene "/$compl_regex/s//'\3'/p"))" | ||
(( ${#completions[@]} == 0 )) && return 0 | ||
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# create temporary file for wrapper functions and completions | ||
rm -f "/tmp/${namespace}-*.tmp" # preliminary cleanup | ||
local tmp_file; tmp_file="$(mktemp "/tmp/${namespace}-${RANDOM}XXX.tmp")" || return 1 | ||
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local completion_loader; completion_loader="$(complete -p -D 2>/dev/null | sed -Ene 's/.* -F ([^ ]*).*/\1/p')" | ||
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# read in "<alias> '<aliased command>' '<command args>'" lines from defined aliases | ||
local line; while read line; do | ||
eval "local alias_tokens; alias_tokens=($line)" 2>/dev/null || continue # some alias arg patterns cause an eval parse error | ||
local alias_name="${alias_tokens[0]}" alias_cmd="${alias_tokens[1]}" alias_args="${alias_tokens[2]# }" | ||
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# skip aliases to pipes, boolean control structures and other command lists | ||
# (leveraging that eval errs out if $alias_args contains unquoted shell metacharacters) | ||
eval "local alias_arg_words; alias_arg_words=($alias_args)" 2>/dev/null || continue | ||
# avoid expanding wildcards | ||
read -a alias_arg_words <<< "$alias_args" | ||
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# skip alias if there is no completion function triggered by the aliased command | ||
if [[ ! " ${completions[*]} " =~ " $alias_cmd " ]]; then | ||
if [[ -n "$completion_loader" ]]; then | ||
# force loading of completions for the aliased command | ||
eval "$completion_loader $alias_cmd" | ||
# 124 means completion loader was successful | ||
[[ $? -eq 124 ]] || continue | ||
completions+=($alias_cmd) | ||
else | ||
continue | ||
fi | ||
fi | ||
local new_completion="$(complete -p "$alias_cmd")" | ||
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# create a wrapper inserting the alias arguments if any | ||
if [[ -n $alias_args ]]; then | ||
local compl_func="${new_completion/#* -F /}"; compl_func="${compl_func%% *}" | ||
# avoid recursive call loops by ignoring our own functions | ||
if [[ "${compl_func#_$namespace::}" == $compl_func ]]; then | ||
local compl_wrapper="_${namespace}::${alias_name}" | ||
echo "function $compl_wrapper { | ||
(( COMP_CWORD += ${#alias_arg_words[@]} )) | ||
COMP_WORDS=($alias_cmd $alias_args \${COMP_WORDS[@]:1}) | ||
(( COMP_POINT -= \${#COMP_LINE} )) | ||
COMP_LINE=\${COMP_LINE/$alias_name/$alias_cmd $alias_args} | ||
(( COMP_POINT += \${#COMP_LINE} )) | ||
$compl_func | ||
}" >> "$tmp_file" | ||
new_completion="${new_completion/ -F $compl_func / -F $compl_wrapper }" | ||
fi | ||
fi | ||
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# replace completion trigger by alias | ||
new_completion="${new_completion% *} $alias_name" | ||
echo "$new_completion" >> "$tmp_file" | ||
done < <(alias -p | sed -Ene "s/$alias_regex/\1 '\2' '\3'/p") | ||
source "$tmp_file" && rm -f "$tmp_file" | ||
}; alias_completion |