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Diffstat (limited to 'examples/functions/newdirstack.bsh')
| -rw-r--r-- | examples/functions/newdirstack.bsh | 165 |
1 files changed, 0 insertions, 165 deletions
diff --git a/examples/functions/newdirstack.bsh b/examples/functions/newdirstack.bsh deleted file mode 100644 index 86b4060f..00000000 --- a/examples/functions/newdirstack.bsh +++ /dev/null @@ -1,165 +0,0 @@ -#!/bin/bash -# @(#) newdirstack.bsh - -# Date: Tue, 31 Jan 2012 16:28:52 +0100 -# Subject: A Bash source code example -# From: Eric Sanchis <eric.sanchis@iut-rodez.fr> -# To: chet.ramey@case.edu -# -# Using Bash everyday, I developped an enhanced implementation of the -# cd/dir functions described in the Bolsky & Korn book, which -# illustrates several specific Bash syntax elements. -# -# It works fine with a non empty CDPATH and cdable variables. In -# addition, a directory name is indexed only once into the stack. -# -# If you find this code snippet useful, would it be possible to include -# it into the bash-doc section of future bash packages ? -# -# Sincerely yours, -# -# Eric -# IUT Rodez -# University of Toulouse (France) - -### -# Another implementation of the directory manipulation functions -# published in the Bolsky & Korn book : "The new Korn shell" : -# cd, to change current directory -# d, to display the stack content -# Eric Sanchis (eric.sanchis@iut-rodez.fr), 2012 -### - - -shopt -s expand_aliases -shopt -s extglob -shopt -s cdable_vars - -alias integer='declare -i' - - integer MAX=32 - integer INDMAX=MAX-1 - integer INDTOP=0 - -unalias cd 2>/dev/null -alias cd=cdir - -unset tab -tab[INDTOP]="$(pwd)" - - -function cdir -{ - local -i ind - -dir="${1:-$HOME}" -case "$dir" in - - ) # cd - => equivalent to : cd -1 - ind=INDTOP-1 - cd_by_number $ind - ;; - -+([[:digit:]]) ) # cd -n - ind=$INDTOP-${dir#-} - cd_by_number $ind - ;; - *) # cd ~ or cd dir_name - cd_by_name "$dir" -esac -} - - -function cd_by_number -{ - local -i k=$1 - local -i j - local dirtmp - -if (( k < 0 )) - then - echo Impossible to change directory >&2 - return 1 - else - dirtmp="${tab[k]}" - j=k+1 - while (( j <= INDTOP )) - do - tab[j-1]="${tab[j]}" - j=j+1 - done - tab[INDTOP]="$dirtmp" - \cd "${tab[INDTOP]}" -fi -} - - -function cd_by_name -{ - local -i i - local rep - -rep=$( \cd "$1" &>/dev/null && pwd) -if [[ -z "$rep" ]] - then - echo cd : "$1" unknown >&2 - return 1 -fi - - i=$INDTOP - while (( i >= 0 )) - do - if [[ "${tab[i]}" == "$rep" ]] - then break - fi - i=i-1 - done - -if (( i == INDTOP )) - then # cd -0 => we do nothing ! - return 0 - elif (( i == -1 )) - then # the directory isn't in the stack - if (( INDTOP == INDMAX )) - then # the stack is FULL - # the oldest directory is removed - local -i m - - m=1 - while (( m <= INDMAX )) - do - tab[m-1]="${tab[m]}" - m=m+1 - done - else # the new directory is added to the top of the stack - INDTOP=INDTOP+1 - fi - tab[INDTOP]="$rep" - \cd "${tab[INDTOP]}" - return 0 - - else # the directory is already in the stack - # $i gives its index - cd_by_number $i -fi -} - - -function d # display the directory stack -{ - local -i i - local rep - -i=0 -while (( $i <= $INDTOP )) - do - rep="${tab[INDTOP-i]#$HOME/}" - case "$rep" in - $HOME) rep="~" ;; - /* ) : ;; - * ) rep="~/$rep" - esac - - echo "$i ) $rep" - i=i+1 - done -} - |