Wie kann ich ein Befehlszeilenargument durch die Tabulatorvervollständigung ersetzen?

Question

Ich frage mich, ob dies in Bash möglich ist, aber ich möchte Tabulatorvervollständigung verwenden, um das aktuelle Argument vollständig zu ersetzen, das erweitert wird. Ich gebe ein Beispiel: Ich möchte eine Funktion haben, die eine beliebige Anzahl von Ebenen in der Struktur nach oben bewegt, so dass ich aufrufen kann 2 Und das würde mich 2 Verzeichnisse nach oben. Allerdings möchte ich es so machen, dass, wenn an der Zahl 2, ich die Tabulatortaste drücken, wird diese Nummer zu dem Pfad erweitert (entweder relativ oder absolut, entweder ist in Ordnung). Ich habe dies fast arbeiten, um die vollständige builtin außer es verwendet, wird nur der Text anhängen, so wird es so etwas wie bis 2/Volumes/Dev/

Ist es möglich, das ausgefüllte Symbol zu ersetzen?

Vielen Dank im Voraus :)

Update:

So ein großer Dank an chepner, weil mein Code tatsächlich Überprüfung ergab, wo war mein Fehler. Ich habe mit der falschen Var verglichen, und der Debug-Code, den ich hatte, verursachte den Wert nicht zu ersetzen.

Für alle Interessierten, hier ist der Code (und es könnte eine viel bessere Möglichkeit, dies zu tun):

# Move up N levels of the directory tree 
# Or by typing in some dir in the PWD 
# eg. Assuming your PWD is "/Volumes/Users/natecavanaugh/Documents/stuff" 
#  `up 2` moves up 2 directories to "/Volumes/Users/natecavanaugh" 
#  `up 2/` and pressing tab will autocomplete the dirs in "/Volumes/Users/natecavanaugh" 
#  `up Users` navigate to "/Volumes/Users" 
#  `up us` and pressing tab will autocomplete to "/Volumes/Users" 
function up { 
    dir="../" 
    if [ -n "$1" ]; then 
     if [[ $1 =~ ^[0-9]+$ ]]; then 
      strpath=$(printf "%${1}s"); 
      dir=" ${strpath// /$dir}" 
     else 
      dir=${PWD%/$1/*}/$1 
     fi 
    fi 

    cd $dir 
} 

function _get_up { 
    local cur 
    local dir 
    local results 
    COMPREPLY=() 
    #Variable to hold the current word 
    cur="${COMP_WORDS[COMP_CWORD]}" 

    local lower_cur=`echo ${cur##*/} | tr [:upper:] [:lower:]` 

    # Is the arg a number or number followed by a slash 
    if [[ $cur =~ ^[0-9]+/? ]]; then 
     dir="../" 
     strpath=$(printf "%${cur%%/*}s"); 
     dir=" ${strpath// /$dir}" 

     # Is the arg just a number? 
     if [[ $cur =~ ^[0-9]+$ ]]; then 
      COMPREPLY=($(compgen -W "${dir}")) 
     else 
      if [[ $cur =~ /.*$ ]]; then 
       cur="${cur##*/}" 
      fi 

      results=$(for t in `cd $dir && ls -d */`; do if [[ `echo $t | tr [:upper:] [:lower:]` == "$lower_cur"* ]]; then echo "${t}"; fi done) 

      COMPREPLY=($(compgen -P "$dir" -W "${results}")) 
     fi 
    else 
     # Is the arg a word that we can look for in the PWD 
     results=$(for t in `echo $PWD | tr "/" "\n"`; do if [[ `echo $t | tr [:upper:] [:lower:]` == "$lower_cur"* ]]; then echo "${t}"; fi; done) 

     COMPREPLY=($(compgen -W "${results}")) 
    fi 
} 

#Assign the auto-completion function _get for our command get. 
complete -F _get_up up 

Answer 1

Die folgende baut auf @ NateCanaugh Code und

• verbessert Robustheit : behandelt Verzeichnisnamen, die \ -escaping benötigen - zB Namen mit eingebetteten Leerzeichen - korrekt; meldet einen Fehler, wenn ein ungültiger Verzeichnisname (ohne Abschluss)
• ändert den Befehl-completion Ansatz angegeben wird: auf Befehl der Fertigstellung der Pegel Nummer/Name Prefix erweitert zu dem entsprechenden absoluten Pfad mit Abschluss ‚/‘, So kann, falls gewünscht, eine weitere Vervollständigung basierend auf Unterverzeichnissen sofort durchgeführt werden.

Die modifizierten Beispiele sind:

# Assume that the working directory is '/Users/jdoe/Documents/Projects/stuff'. 
# `up 2` moves 2 levels up to '/Users/jdoe/Documents' 
# `up 2<tab>` completes to `up /Users/jdoe/Documents/` 
#  Hit enter to change to that path or [type additional characters and] 
#  press tab again to complete based on subdirectories. 
# `up Documents` or `up documents` changes to '/Users/jdoe/Documents' 
# `up Doc<tab>` or `up doc<tab>` completes to `up /Users/jdoe/Documents/` 
#  Hit enter to change to that path or [type additional characters and] 
#  press tab again to complete based on subdirectories. 
#  Note: Case-insensitive completion is only performed if it is turned on 
#  globally via the completion-ignore-case Readline option 
#  (configured, for instance, via ~/.inputrc or /etc/inputrc). 

Hier ist der vollständige Code (beachten Sie, dass die Syntax-Einfärbung fehlerhaften Code vermuten läßt, aber das ist nicht der Fall ist):

# Convenience function for moving up levels in the path to the current working directory. 
# Synopsis: 
#  `up [n]` moves n levels up in the directory hierarchy; default is 1. 
#  `up dirname` changes to the closest ancestral directory by that name, regardless of case. 
#  `up absolutepath` changes to the specified absolute path; primarily used with command completion (see below). 
# Additionally, if command completion via _complete_up() is in effect (<tab> represents pressing the tab key): 
#  `up [n]<tab>` replaces n with the absolute path of the directory n levels up (default is 1). 
#  `up dirnameprefix<tab>` replaces dirnameprefix with the absolute path of the closest ancestral directory whose name starts with the specified name prefix, terminated with '/'. 
#   Whether dirnameprefix is matched case-insensitively or not depends on whether case-insensitive command completion is turned on globally via ~/.inputrc or /etc/inputrc. 
#  In both cases the completed absolute path ends in '/', allowing you to optionally continue completion based on that path's subdirectories. 
# Notes: 
# - Directory names with characters that need escaping when unquoted (such as spaces) are handled correctly. 
# - For command completion, to specify names that need escaping when unquoted, specify them escaped rather than quoted; 
#  e.g., `up my \di<tab>' to match 'my dir' in the ancestral path. 
function up { 

    local dir='../' # By default, go up 1 level. 

    [[ "$1" == '-h' || "$1" == '--help' ]] && { echo -e "usage:\n\t$FUNCNAME [n]\n\t$FUNCNAME dirname\n Moves up N levels in the path to the current working directory, 1 by default.\n If DIRNAME is given, it must be the full name of an ancestral directory (case does not matter).\n If there are multiple matches, the one *lowest* in the hierarchy is changed to." && return 0; } 

    if [[ -n "$1" ]]; then 
     if [[ $1 =~ ^[0-9]+$ ]]; then # A number, specifying the number of levels to go up.    
      local strpath=$(printf "%${1}s") # This creates a string with as many spaces as levels were specified. 
      dir=${strpath// /$dir} # Create the go-up-multiple-levels cd expression by replacing each space with '../' 
     elif [[ $1 =~ ^/ ]]; then # Already an absolute path? Use as is. (Typically, this happens as a result of command-line completion invoked via _complete_up().) 
      dir=$1 
     else # Assumed to be the full name of an ancestral directory (regardless of level), though the case needn't match. 
      # Note: On case-insensitive HFS+ volumes on a Mac (the default), you can actually use case-insensitive names with 'cd' and the resulting working directory will be reported in that case(!). 
      #  This behavior is NOT related to whether case-insensitivity is turned on for command completion or not. 
      # !! Strangely, the 'nocasematch' shopt setting has no effect on variable substitution, so we need to roll our own case-insensitive substitution logic here. 
      local wdLower=$(echo -n "$PWD" | tr '[:upper:]' '[:lower:]') 
      local tokenLower=$(echo -n "$1" | tr '[:upper:]' '[:lower:]') 
      local newParentDirLower=${wdLower%/$tokenLower/*} # If the specified token is a full ancestral directory name (irrespective of case), this substitution will give us its parent path. 
      [[ "$newParentDirLower" == "$wdLower" ]] && { echo "$FUNCNAME: No ancestral directory named '$1' found." 1>&2; return 1; } 
      local targetDirPathLength=$((${#newParentDirLower} + 1 + ${#tokenLower})) 
      # Get the target directory's name in the exact case it's defined. 
      dir=${PWD:0:$targetDirPathLength} 
     fi 
    fi 

    # Change to target directory; use of 'pushd' allows use of 'popd' to return to previous working directory. 
    pushd "$dir" 1>/dev/null 
} 

# Companion function to up(), used for command completion. 
# To install it, run (typically in your bash profile): 
# `complete -o filenames -F _complete_up up` 
# Note: The '-o filenames' option ensures that: 
# (a) paths of directories returned via $COMPREPLY leave the cursor at the terminating "/" for potential further completion 
# (b) paths with embeddes spaces and other characters requiring \-escaping are properly escaped. 
function _complete_up { 

    COMPREPLY=() # Initialize the array variable through which completions must be passed out. 

    # Retrieve the current command-line token, i.e., the one on which completion is being invoked. 
    local curToken=${COMP_WORDS[COMP_CWORD]} 
    # Remove \ chars., presumed to be escape characters in the current token, which is presumed to be *unquoted*. This allows invoking completion on a token with embedded space, e.g., '$FUNCNAME some\ directory' 
    # !! Strictly speaking, we'd have to investigate whether the token was specified with quotes on the command line and, if quoted, NOT unescape. Given that the purpose of this function is expedience, we 
    # !! assume that the token is NOT quoted and that all backslashes are therefore escape characters to be removed. 
    curToken=${curToken//'\'} 

    if [[ $curToken =~ ^/ ]]; then # Token is an absolute path (typically as a result of a previous completion) -> complete with directory names, similar to 'cd' (although the latter, curiously, also completes *file* names). 

     local IFS=$'\n' # Make sure that the output of compgen below is only split along lines, not also along spaces (which the default $IFS would do). 
     COMPREPLY=($(compgen -o dirnames -- "$curToken")) 

    elif [[ $curToken =~ ^[0-9]+/? ]]; then # Token is a number (optionally followed by a slash) -> replace the token to be completed with the absolute path of the directory N levels above, where N is the number specified. 

     # Create a go-up-multiple-levels cd expression that corresponds to the number of levels specified. 
     local strpath=$(printf "%${curToken%%/*}s") # This creates a string with as many spaces as levels were specified. 
     local upDirSpec=${strpath// /../} # Create the go-up-multiple-levels cd expression by replacing each space with '../'   

     # Expand to absolute path (ending in '/' to facilitate optional further completion) and return. 
     local dir=$(cd "$upDirSpec"; echo -n "$PWD/") 
     if [[ "$dir" == '//' ]]; then dir='/'; fi # In case the target dir turns out to be the root dir, we've accidentally created '//' in the previous statement; fix it. 
     # !! Note that the path will appear *unquoted* on the command line and must therefore be properly \-escaped (e.g., a ' ' as '\ '). 
     # !! Escaping is performed automatially by virtue of defining the compspec with '-o filenames' (passed to 'complete'). 
     COMPREPLY=("$dir") 

    else # Token is a name -> look for a prefix match among all the ancestral path components; use the first match found (i.e., the next match up in the hierarchy). 

     # Determine if we should do case-insensitive matching or not, depending on whether cases-insensitive completion was turned on globally via ~/.inputrc or /etc/inputrc. 
     # We do this to be consistent with the default command completion behavior. 
     local caseInsensitive=0   
     bind -v | egrep -i '\bcompletion-ignore-case[[:space:]]+on\b' &>/dev/null && caseInsensitive=1 

     # If we need to do case-INsensitive matching in this function, we need to make sure the 'nocasematch' shell option is (temporarily) turned on. 
     local nocasematchWasOff=0 
     if ((caseInsensitive)); then 
      nocasematchWasOff=1 
      shopt nocasematch >/dev/null && nocasematchWasOff=0 
      ((nocasematchWasOff)) && shopt -s nocasematch >/dev/null 
     fi 

     local pathSoFar='' 
     local matchingPath='' 
     # Note: By letting the loop iterate over ALL components starting at the root, we end up with the *last* match, i.e. the one *lowest* in the hierarchy (closed to the current working folder). 
     # !! We COULD try to return multiple matches, if applicable, but in practice we assume that there'll rarely be paths whose components have identical names or prefixes. 
     # !! Thus, should there be multiple matches, the user can reinvoke the same command to change to the next-higher match (though the command must be typed again), and so forth. 
     local parentPath=${PWD%/*} 
     local IFS='/' # This will break our parent path into components in the 'for' loop below. 
     local name 
     for name in ${parentPath:1}; do 
      pathSoFar+=/$name 
      if [[ "$name" == "$curToken"* ]]; then 
       matchingPath="$pathSoFar/" 
      fi 
     done 

     # Restore the state of 'nocasematch', if necessary. 
     ((caseInsensitive && nocasematchWasOff)) && shopt -u nocasematch >/dev/null 

     # If match was found, return its absolute path (ending in/to facilitate optional further completion). 
     # !! Note that the path will appear *unquoted* on the command line and must therefore be properly \-escaped (e.g., a ' ' as '\ '). 
     # !! Escaping is performed automatially by virtue of defining the compspec with '-o filenames' (passed to 'complete'). 
     [[ -n "$matchingPath" ]] && COMPREPLY=("$matchingPath") 

    fi 
} 

# Assign the auto-completion function for up(). 
complete -o filenames -F _complete_up up 

Answer 2

Es ist möglich, Ersetzen Sie das aktuelle Wort vollständig durch ein einziges neues Wort. Mit meinem Bash 4.2.29, kann ich dies tun:

_xxx() { COMPREPLY=(foo); } 
complete -F _xxx x 
x bar # pressing tab turns this into x foo 

Sie stoßen auf Probleme, aber wenn es mehr als eine mögliche Beendigung ist, und Sie möchten Teil Vollendung des gemeinsamen Präfix erhalten. Dann zeigen meine Experimente an, dass bash versuchen wird, die verfügbaren Komplettierungen mit dem eingegebenen Präfix abzugleichen.

Also im Allgemeinen sollten Sie wahrscheinlich nur das aktuelle Argument durch etwas völlig anderes ersetzen, wenn das etwas eindeutig definiert ist. Andernfalls sollten Sie Komplettierungen generieren, die dem aktuellen Präfix entsprechen, damit der Benutzer daraus auswählen kann.In Ihrem Fall könnten Sie die COMPREPLY=($(compgen -P "$dir" -W "${results}")) mit etwas in dieser Richtung ersetzen:

local IFS=$'\n' 
COMPREPLY=($(find "${dir}" -maxdepth 1 -type d -iname "${cur#*/}*" -printf "%P\n")) 
if [[ ${#COMPREPLY[@]} -eq 1 ]]; then 
    COMPREPLY=("${dir}${COMPREPLY[0]}") 
fi 

jedoch in diesem speziellen Fall könnte es besser sein, nur das Präfix Ziffer durch den entsprechenden Pfad zu ersetzen, und alles andere auf den Standard bash verlassen Vervollständigung:

_up_prefix() { 
    local dir cur="${COMP_WORDS[COMP_CWORD]}" 
    COMPREPLY=() 

    if [[ ${cur} =~ ^[0-9]+/? ]]; then 
     # Starting with a number, possibly followed by a slash 
     dir=$(printf "%${cur%%/*}s"); 
     dir="${dir// /../}" 
     if [[ ${cur} == */* ]]; then 
      dir="${dir}${cur#*/}" 
     fi 
     COMPREPLY=("${dir}" "${dir}.") # hack to suppress trailing space 
    elif [[ ${cur} != */* ]]; then 
     # Not a digit, and no slash either, so search parent directories 
     COMPREPLY=($(IFS='/'; compgen -W "${PWD}" "${cur}")) 
     if [[ ${#COMPREPLY[@]} -eq 1 ]]; then 
      dir="${PWD%${COMPREPLY[0]}/*}${COMPREPLY[0]}/" 
      COMPREPLY=("${dir}" "${dir}.") # hack as above 
     fi 
    fi 
} 

complete -F _up_prefix -o dirnames up 

Der Code wird viel einfacher zu lesen und zu pflegen, plus effizienter zu booten. Der einzige Nachteil ist, dass Sie in einigen Fällen die Tabulatortaste noch einmal drücken müssen: Einmal, um das Präfix zu ersetzen, und zweimal, um die Liste der möglichen Komplettierungen zu sehen. Ihre Wahl, ob das akzeptabel ist.

Noch eine Sache: Die Vervollständigung wird das Argument in einen regulären Pfad umwandeln, aber Ihre Up-Funktion, so wie sie ist, akzeptiert diese nicht. Vielleicht sollten Sie diese Funktion mit einer [[ -d $1 ]] Prüfung starten und einfach in dieses Verzeichnis wechseln, wenn es existiert. Andernfalls erzeugt Ihre Vervollständigung Argumente, die für die aufgerufene Funktion inakzeptabel sind.