vcsh: Only fetch the upstream branch during clone

[code/vcsh.git] / vcsh

diff --git a/vcsh b/vcsh
index 25f52f844099e382e42310dda2d8694c30228b50..898bdb54bf192d9112b73cb3d5eb63e98d86ef32 100755 (executable)
--- a/vcsh
+++ b/vcsh
@@ -1,245 +1,518 @@
 #!/bin/sh
 
 #!/bin/sh
 

-[ -n "$VCSH_DEBUG" ] && set -x
+# This program is licensed under the GNU GPL version 2 or later.
+# (c) Richard "RichiH" Hartmann <richih@debian.org>, 2011-2014
+# For details, see LICENSE. To submit patches, you have to agree to
+# license your code under the GNU GPL version 2 or later.

 
 

+# While the following is not legally binding, the author would like to
+# explain the choice of GPLv2+ over GPLv3+.
+# The author prefers GPLv3+ over GPLv2+ but feels it's better to maintain
+# full compatibility's with Git. In case Git ever changes its licensing terms,
+# which is admittedly extremely unlikely to the point of being impossible,
+# this software will most likely follow suit.
+
+# This should always be the first line of code to facilitate debugging
+[ -n "$VCSH_DEBUG" ] && set -vx
+
+
+# If '.git-HEAD' is appended to the version, you are seeing an unreleased
+# version of vcsh; the master branch is supposed to be clean at all times
+# so you can most likely just use it nonetheless
+VERSION='1.20140508'

 SELF=$(basename $0)
 
 SELF=$(basename $0)
 

-[ -z "$XDG_CONFIG_HOME" ] && XDG_CONFIG_HOME="$HOME/.config"
-[ -z "$VCSH_BASE" ]       && VCSH_BASE="$XDG_CONFIG_HOME/vcsh/repo.d"
-for check_directory in "$VCSH_BASE" "$HOME/.gitignore.d"
-do
-       if [ ! -d "$check_directory" ]; then
-               if [ -e "$check_directory" ]; then
-                       echo "$SELF: error: $check_directory exists but is not a directory" >&2
-                       exit 2
-               else
-                       echo "$SELF: info: attempting to create $check_directory"
-                       mkdir -p "$check_directory" || (echo "$SELF: error: could not create $check_directory" >&2; exit 2)
-               fi
+fatal() {
+       echo "$SELF: fatal: $1" >&2
+       exit $2
+}
+
+# We need to run getops as soon as possible so we catch -d and other
+# options that will modify our behaviour.
+# Commands are handled at the end of this script.
+while getopts "c:dv" flag; do
+       if [ x"$1" = x'-d' ] || [ x"$1" = x'--debug' ]; then
+               set -vx
+               VCSH_DEBUG=1
+               echo "debug mode on"
+               echo "$SELF $VERSION"
+       elif [ x"$1" = x'-v' ]; then
+               VCSH_VERBOSE=1
+               echo "verbose mode on"
+               echo "$SELF $VERSION"
+       elif [ x"$1" = x'-c' ]; then
+               VCSH_OPTION_CONFIG=$OPTARG

        fi
        fi

+       shift 1

 done
 
 done
 

+source_all() {
+       # Source file even if it's in $PWD and does not have any slashes in it
+       case $1 in
+               */*) . "$1";;
+               *)   . "$PWD/$1";;
+       esac;
+}
+
+
+# Read configuration and set defaults if anything's not set
+[ -n "$VCSH_DEBUG" ]                  && set -vx
+: ${XDG_CONFIG_HOME:="$HOME/.config"}
+
+# Read configuration files if there are any
+[ -r "/etc/vcsh/config" ]             && . "/etc/vcsh/config"
+[ -r "$XDG_CONFIG_HOME/vcsh/config" ] && . "$XDG_CONFIG_HOME/vcsh/config"
+if [ -n "$VCSH_OPTION_CONFIG" ]; then
+       # Source $VCSH_OPTION_CONFIG if it can be read and is in $PWD of $PATH
+       if [ -r "$VCSH_OPTION_CONFIG" ]; then
+               source_all "$VCSH_OPTION_CONFIG"
+       else
+               fatal "Can not read configuration file '$VCSH_OPTION_CONFIG'" 1
+       fi
+fi
+[ -n "$VCSH_DEBUG" ]                  && set -vx
+
+# Read defaults
+: ${VCSH_REPO_D:="$XDG_CONFIG_HOME/vcsh/repo.d"}
+: ${VCSH_HOOK_D:="$XDG_CONFIG_HOME/vcsh/hooks-enabled"}
+: ${VCSH_BASE:="$HOME"}
+: ${VCSH_GITIGNORE:=exact}
+: ${VCSH_GITATTRIBUTES:=none}
+: ${VCSH_WORKTREE:=absolute}
+
+if [ ! "x$VCSH_GITIGNORE" = 'xexact' ] && [ ! "x$VCSH_GITIGNORE" = 'xnone' ] && [ ! "x$VCSH_GITIGNORE" = 'xrecursive' ]; then
+       fatal "'\$VCSH_GITIGNORE' must equal 'exact', 'none', or 'recursive'" 1
+fi
+
+if [ ! "x$VCSH_WORKTREE" = 'xabsolute' ] && [ ! "x$VCSH_WORKTREE" = 'xrelative' ]; then
+       fatal "'\$VCSH_WORKTREE' must equal 'absolute', or 'relative'" 1
+fi
+
+
+help() {
+       echo "usage: $SELF <options> <command>
+
+   options:
+   -c <file>            Source file
+   -d                   Enable debug mode
+   -v                   Enable verbose mode
+
+   commands:
+   clone <remote> \\
+         [<repo>]       Clone from an existing repository
+   commit               Commit in all repositories
+   delete <repo>        Delete an existing repository
+   enter <repo>         Enter repository; spawn new instance of \$SHELL
+   help                 Display this help text
+   init <repo>          Initialize a new repository
+   list                 List all repositories
+   list-tracked         List all files tracked by vcsh
+   list-tracked-by \\
+        <repo>          List files tracked by a repository
+   pull                 Pull from all vcsh remotes
+   push                 Push to vcsh remotes
+   rename <repo> \\
+          <newname>     Rename repository
+   run <repo> \\
+       <command>        Use this repository
+   status [<repo>]      Show statuses of all/one vcsh repositories
+   upgrade <repo>       Upgrade repository to currently recommended settings
+   version              Print version information
+   which <substring>    Find substring in name of any tracked file
+   write-gitignore \\
+   <repo>               Write .gitignore.d/<repo> via git ls-files
+
+   <repo> <git command> Shortcut to run git commands directly
+   <repo>               Shortcut to enter repository" >&2
+}
+

 debug() {
 debug() {

-       [ -n "$VCSH_DEBUG" ] && echo "$SELF: debug: $1"
+       [ -n "$VCSH_DEBUG" ] && echo "$SELF: debug: $@"

 }
 
 verbose() {
 }
 
 verbose() {

-       if [ -n "$VCSH_DEBUG" ] || [ -n "$VCSH_VERBOSE" ]; then echo "$SELF: verbose: $1"; fi
+       if [ -n "$VCSH_DEBUG" ] || [ -n "$VCSH_VERBOSE" ]; then echo "$SELF: verbose: $@"; fi

 }
 
 }
 

-#   use <repo>     Use this repository
-#
-#   exit              Exit vcsh mode" >&2
-help() {
-       echo "usage: $SELF <args>
+error() {
+       echo "$SELF: error: $1" >&2
+}

 
 

-   help              Display this help
+info() {
+       echo "$SELF: info: $1"
+}

 
 

-   list              List all repos
+clone() {
+       hook pre-clone
+       init
+       git remote add origin "$GIT_REMOTE"
+       git config branch."$VCSH_BRANCH".remote origin
+       git config branch."$VCSH_BRANCH".merge  refs/heads/"$VCSH_BRANCH"
+       git checkout -b $VCSH_BRANCH
+       if [ $(git ls-remote origin "$VCSH_BRANCH" 2> /dev/null | wc -l ) -lt 1 ]; then
+               info "remote is empty, not merging anything"
+               exit
+       fi
+       git fetch origin "$VCSH_BRANCH"
+       hook pre-merge
+       git ls-tree -r --name-only origin/master | (while read object; do
+               [ -e "$object" ] &&
+                       error "'$object' exists." &&
+                       VCSH_CONFLICT=1
+       done
+       [ x"$VCSH_CONFLICT" = x'1' ]) &&
+               fatal "will stop after fetching and not try to merge!
+  Once this situation has been resolved, run 'vcsh $VCSH_REPO_NAME pull' to finish cloning." 17
+       git merge origin/"$VCSH_BRANCH"
+       hook post-merge
+       hook post-clone
+       retire
+       hook post-clone-retired
+}

 
 

-   run <repo> \\
-       <command>     Use this repository
+commit() {
+       hook pre-commit
+       for VCSH_REPO_NAME in $(list); do
+               echo "$VCSH_REPO_NAME: "
+               GIT_DIR=$VCSH_REPO_D/$VCSH_REPO_NAME.git; export GIT_DIR
+               use
+               git commit --untracked-files=no --quiet
+               VCSH_COMMAND_RETURN_CODE=$?
+               echo
+       done
+       hook post-commit
+}

 
 

-   init <repo>       Initialize a new repository
-   clone <remote> \\
-         [<repo>]    Clone from an existing repository
-   seed-gitignore \\
-   <repo>            Seed .gitignore.d/<repo> from git ls-files" >&2
+delete() {
+       cd "$VCSH_BASE" || fatal "could not enter '$VCSH_BASE'" 11
+       use
+       info "This operation WILL DESTROY DATA!"
+       files=$(git ls-files)
+       echo "These files will be deleted:
+
+$files
+
+AGAIN, THIS WILL DELETE YOUR DATA!
+To continue, type 'Yes, do as I say'"
+       read answer
+       [ "x$answer" = 'xYes, do as I say' ] || exit 16
+       for file in $files; do
+               rm -f $file || info "could not delete '$file', continuing with deletion"
+       done
+       rm -rf "$GIT_DIR" || error "could not delete '$GIT_DIR'"

 }
 
 }
 

-use() {
-       verbose "use() begin"
-       REPO_NAME="$1"
-       GIT_DIR="$VCSH_BASE/$REPO_NAME.git"
+enter() {
+       hook pre-enter
+       use
+       $SHELL
+       hook post-enter
+}

 
 

-       if [ ! -d "$GIT_DIR" ]; then
-               echo E: no repository found for "$REPO_NAME" >&2
-               return 1
-       fi
+git_dir_exists() {
+       [ -d "$GIT_DIR" ] || fatal "no repository found for '$VCSH_REPO_NAME'" 12
+}

 
 

-       export GIT_DIR
-       export GIT_WORK_TREE="$(git config --get core.worktree)"
-       export VCSH_DIRECTORY="$REPO_NAME"
-       verbose "use() end"
+hook() {
+       for hook in "$VCSH_HOOK_D/$1"* "$VCSH_HOOK_D/$VCSH_REPO_NAME.$1"*; do
+               [ -x "$hook" ] || continue
+               verbose "executing '$hook'"
+               "$hook"
+       done

 }
 
 init() {
 }
 
 init() {

-       verbose "init() begin"
-       [ -e "$GIT_DIR" ] &&
-               echo "$SELF: fatal: $GIT_DIR exists" &&
-               return 21
-       export GIT_WORK_TREE="$HOME"
-       mkdir -p "$GIT_WORK_TREE"
-       cd "$GIT_WORK_TREE" ||
-               (echo "$SELF: fatal: could not enter $GIT_WORK_TREE" &&
-                exit 20) || exit 20
-       cd "$GIT_WORK_TREE"
-       git init
-       git config core.worktree     "$GIT_WORK_TREE"
-       git config core.excludesfile ".gitignore.d/$REPO_NAME"
-       touch   "$HOME/.gitignore.d/$REPO_NAME"
-       git add "$HOME/.gitignore.d/$REPO_NAME"
-       verbose "init() end"
-}
-
-leave() {
-       unset GIT_DIR
-       unset GIT_WORK_TREE
-       unset VCSH_DIRECTORY
+       hook pre-init
+       [ ! -e "$GIT_DIR" ] || fatal "'$GIT_DIR' exists" 10
+       mkdir -p "$VCSH_BASE" || fatal "could not create '$VCSH_BASE'" 50
+       cd "$VCSH_BASE" || fatal "could not enter '$VCSH_BASE'" 11
+       git init --shared=0600
+       upgrade
+       hook post-init
+}
+
+list() {
+       for repo in "$VCSH_REPO_D"/*.git; do
+               [ -d "$repo" ] && [ -r "$repo" ] && echo "$(basename "$repo" .git)"
+       done
+}
+
+get_files() {
+       GIT_DIR=$VCSH_REPO_D/$VCSH_REPO_NAME.git; export GIT_DIR
+       git ls-files
+}
+
+list_tracked() {
+       for VCSH_REPO_NAME in $(list); do
+               get_files
+       done | sed "s,^,$(printf '%s\n' "$VCSH_BASE/" | \
+           sed 's/[,\&]/\\&/g')," | sort -u

 }
 
 }
 

-if [ "$1" = 'help' ] || [ "$#" -eq 0 ]; then
-       help
-       [ "$1" = 'help' ]
-       exit $?
+list_tracked_by() {
+       use
+       git ls-files | sed "s,^,$(printf '%s\n' "$VCSH_BASE/" | \
+           sed 's/[,\&]/\\&/g')," | sort -u
+}

 
 

-elif [ "$1" = 'list' ]; then
-       verbose "list begin"
-       for i in "$VCSH_BASE"/*.git; do
-               echo $(basename "$i" .git)
+pull() {
+       hook pre-pull
+       for VCSH_REPO_NAME in $(list); do
+               printf '%s: ' "$VCSH_REPO_NAME"
+               GIT_DIR=$VCSH_REPO_D/$VCSH_REPO_NAME.git; export GIT_DIR
+               use
+               git pull
+               VCSH_COMMAND_RETURN_CODE=$?
+               echo

        done
        done

-       verbose "list end"
-       exit 0
+       hook post-pull
+}
+
+push() {
+       hook pre-push
+       for VCSH_REPO_NAME in $(list); do
+               printf '%s: ' "$VCSH_REPO_NAME"
+               GIT_DIR=$VCSH_REPO_D/$VCSH_REPO_NAME.git; export GIT_DIR
+               use
+               git push
+               VCSH_COMMAND_RETURN_CODE=$?
+               echo
+       done
+       hook post-push
+}
+
+retire() {
+       unset VCSH_DIRECTORY
+}
+
+rename() {
+       git_dir_exists
+       [ -d "$GIT_DIR_NEW" ] && fatal "'$GIT_DIR_NEW' exists" 54
+       mv -f "$GIT_DIR" "$GIT_DIR_NEW" || fatal "Could not mv '$GIT_DIR' '$GIT_DIR_NEW'" 52
+
+       # Now that the repository has been renamed, we need to fix up its configuration
+       # Overwrite old name..
+       GIT_DIR=$GIT_DIR_NEW
+       VCSH_REPO_NAME=$VCSH_REPO_NAME_NEW
+       # ..and clobber all old configuration
+       upgrade
+}

 
 

-elif [ "$1" = 'run' ]; then
-       verbose "run begin"
-       use "$2" || return 1
-       shift 2
+run() {
+       hook pre-run
+       use

        "$@"
        "$@"

-       leave
-       verbose "run end"
-       exit 0
-
-#elif [ "$1" = 'use' ]; then
-#      verbose "use begin"
-#      if [ -n "$ZSH_VERSION" ]; then
-#              if [ -o NO_IGNORE_EOF ]; then
-#                      export VCSH_NO_IGNORE_EOF=1
-#                      setopt IGNORE_EOF
-#              fi
-#              vcsh_exit() {
-#                      vcsh exit;
-#                      zle reset-prompt;
-#              }
-#              zle -N vcsh_exit
-#              bindkey '^d' 'vcsh_exit'
-#      fi
-#      use "$2" || return 1
-#      [ -n "$ZSH_VERSION" ] && [ "$USER" = richih ] && buildPS1
-#      verbose "use end"
-#      exit 0
-
-elif [ "$1" = 'clone' ]; then
-       verbose "clone begin"
-       GIT_REMOTE="$2"
-       REPO_NAME="$3"
-       [ -z "$REPO_NAME" ] && REPO_NAME=$(basename "$GIT_REMOTE" .git)
-       export REPO_NAME
-       export GIT_DIR="$VCSH_BASE/$REPO_NAME.git"
-       init
+       VCSH_COMMAND_RETURN_CODE=$?
+       hook post-run
+}

 
 

-       git remote add origin "$GIT_REMOTE"
-       git config branch.master.remote origin
-       git config branch.master.merge  refs/heads/master
-       git config core.excludesfile    ".gitignore.d/$REPO_NAME"
-       git fetch
-       for object in $(git ls-tree -r origin/master | awk '{print $4}'); do
-               [ -e "$object" ] &&
-                       echo "$SELF: error: $object exists." &&
-                       VCSH_CONFLICT=1;
-       done
-       [ "$VCSH_CONFLICT" = '1' ] &&
-               echo "$SELF: fatal: will stop after fetching and not try to merge!\n" &&
-               echo "  Once this situation has been resolved, run 'vcsh run <foo> git pull' to finish cloning.\n" &&
-               exit 3
-       git merge origin/master
-#      use $REPO_NAME || return 1
-       verbose "clone end"
-
-elif [ "$1" = 'init' ]; then
-       verbose "init begin"
-       [ -z $2 ] && help && echo && echo "$SELF $1: error: please specify repository to work on" && return 0
-       export REPO_NAME="$2"
-       export GIT_DIR="$VCSH_BASE/$REPO_NAME.git"
-       init
-#      use "$REPO_NAME" || return 1
-       verbose "init end"
-
-#elif [ "$1" = 'exit' ]; then
-#      verbose "exit begin"
-#      if [ -n "$ZSH_VERSION" ] && [ "$VCSH_NO_IGNORE_EOF" = '1' ]; then
-#              unset VCSH_NO_IGNORE_EOF
-#              setopt NO_IGNORE_EOF
-#      fi
-#      leave
-#      [ -n "$ZSH_VERSION" ] && [ "$USER" = richih ] && buildPS1
-#      verbose "exit end"
-#      exit 0
-
-elif [ "$1" = 'seed-gitignore' ]; then
-       verbose "seed-gitignore begin"
-       [ -z $2 ] && help && echo && echo "$SELF $1: error: please specify repository to work on" && return 0
-       use $2 || return 1
-       # Switching directory as this has to be executed from $HOME to be of any use.
-       # Going back into old directory at the end in case `vcsh use` is reactivated.
-       old_dir="$PWD"
-       cd "$HOME"
-       git config core.excludesfile ".gitignore.d/$REPO_NAME"
+status() {
+       if [ -n "$VCSH_REPO_NAME" ]; then
+               GIT_DIR=$VCSH_REPO_D/$VCSH_REPO_NAME.git; export GIT_DIR
+               use
+               git status --short --untracked-files='no'
+               VCSH_COMMAND_RETURN_CODE=$?
+       else
+               for VCSH_REPO_NAME in $(list); do
+                       echo "$VCSH_REPO_NAME:"
+                       GIT_DIR=$VCSH_REPO_D/$VCSH_REPO_NAME.git; export GIT_DIR
+                       use
+                       git status --short --untracked-files='no'
+                       VCSH_COMMAND_RETURN_CODE=$?
+                       echo
+               done
+       fi
+}
+
+upgrade() {
+       hook pre-upgrade
+       # fake-bare repositories are not bare, actually. Set this to false
+       # because otherwise Git complains "fatal: core.bare and core.worktree
+       # do not make sense"
+       git config core.bare false
+       # core.worktree may be absolute or relative to $GIT_DIR, depending on
+       # user preference
+       if [ ! "x$VCSH_WORKTREE" = 'xabsolute' ]; then
+               git config core.worktree "$(cd "$GIT_DIR" && GIT_WORK_TREE=$VCSH_BASE git rev-parse --show-cdup)"
+       elif [ ! "x$VCSH_WORKTREE" = 'xrelative' ]; then
+               git config core.worktree "$VCSH_BASE"
+       fi
+       [ ! "x$VCSH_GITIGNORE" = 'xnone' ] && git config core.excludesfile ".gitignore.d/$VCSH_REPO_NAME"
+       [ ! "x$VCSH_GITATTRIBUTES" = 'xnone' ] && git config core.attributesfile ".gitattributes.d/$VCSH_REPO_NAME"
+       git config vcsh.vcsh 'true'
+       use
+       [ -e "$VCSH_BASE/.gitignore.d/$VCSH_REPO_NAME" ] && git add -f "$VCSH_BASE/.gitignore.d/$VCSH_REPO_NAME"
+       [ -e "$VCSH_BASE/.gitattributes.d/$VCSH_REPO_NAME" ] && git add -f "$VCSH_BASE/.gitattributes.d/$VCSH_REPO_NAME"
+       hook post-upgrade
+}
+
+use() {
+       git_dir_exists
+       VCSH_DIRECTORY=$VCSH_REPO_NAME; export VCSH_DIRECTORY
+}
+
+which() {
+       for VCSH_REPO_NAME in $(list); do
+               for VCSH_FILE in $(get_files); do
+                       echo "$VCSH_FILE" | grep -q "$VCSH_COMMAND_PARAMETER" && echo "$VCSH_REPO_NAME: $VCSH_FILE"
+               done
+       done | sort -u
+}
+
+write_gitignore() {
+       # Don't do anything if the user does not want to write gitignore
+       if [ "x$VCSH_GITIGNORE" = 'xnone' ]; then
+               info "Not writing gitignore as '\$VCSH_GITIGNORE' is set to 'none'"
+               exit
+       fi
+
+       use
+       cd "$VCSH_BASE" || fatal "could not enter '$VCSH_BASE'" 11
+       OLDIFS=$IFS
+       IFS=$(printf '\n\t')

        gitignores=$(for file in $(git ls-files); do
                while true; do
        gitignores=$(for file in $(git ls-files); do
                while true; do

-                       echo $file; new="${file%/*}"
-                       [ "$file" = "$new" ] && break
-                       file="$new"
+                       echo "$file"; new=${file%/*}
+                       [ x"$file" = x"$new" ] && break
+                       file=$new

                done;
                done;

-       done | sort -u | sed 's/^/!/')
-       tempfile=$(mktemp) ||
-               (echo "$SELF: fatal: could not create tempfile" && exit 1) 
-       echo '*' > "$tempfile"
+       done | sort -u)
+
+       # Contrary to GNU mktemp, mktemp on BSD/OSX requires a template for temp files
+       # Using a template makes GNU mktemp default to $PWD and not #TMPDIR for tempfile location
+       # To make every OS happy, set full path explicitly
+       tempfile=$(mktemp "${TMPDIR:-/tmp}/tmp.XXXXXXXXXX") || fatal "could not create tempfile: '${tempfile}'" 51
+
+       echo '*' > "$tempfile" || fatal "could not write to '$tempfile'" 57

        for gitignore in $gitignores; do
        for gitignore in $gitignores; do

-               echo "$gitignore" >> "$tempfile"
+               echo "$gitignore" | sed 's@^@!/@' >> "$tempfile" || fatal "could not write to '$tempfile'" 57
+               if [ "x$VCSH_GITIGNORE" = 'xrecursive' ] && [ -d "$gitignore" ]; then
+                       { echo "$gitignore/*" | sed 's@^@!/@' >> "$tempfile" || fatal "could not write to '$tempfile'" 57; }
+               fi

        done
        done

-       diff -N "$tempfile" "$HOME/.gitignore.d/$2" > /dev/null &&
-               rm -f "$tempfile" &&
-               return
-       if [ -e "$HOME/.gitignore.d/$2" ]; then
-               echo "$SELF: info: $HOME/.gitignore.d/$2 differs from new data, moving it to $HOME/.gitignore.d/$2.bak"
-               mv -f "$HOME/.gitignore.d/$2" "$HOME/.gitignore.d/$2.bak" ||
-                       (echo "$SELF: fatal: could not move $HOME/.gitignore.d/$2 to $HOME/.gitignore.d/$2.bak" && exit 1)
+       IFS=$OLDIFS
+       if diff -N "$tempfile" "$VCSH_BASE/.gitignore.d/$VCSH_REPO_NAME" > /dev/null; then
+               rm -f "$tempfile" || error "could not delete '$tempfile'"
+               exit

        fi
        fi

-       mv -f "$tempfile" "$HOME/.gitignore.d/$2" ||
-               (echo "$SELF: fatal: could not move $tempfile to $HOME/.gitignore.d/$2" && exit 1)
-       cd "$old_dir"
-       verbose "seed-gitignore end"
-
-elif [ "$1" = 'delete' ]; then
-       verbose "delete begin"
-       REPO_NAME=$2
-       [ -z $REPO_NAME ] && help && echo && echo "$SELF $1: error: please specify repository to work on" && return 0
-       old_dir="$PWD"
-       cd "$HOME"
-       use $REPO_NAME || return 1
-       echo "$SELF: info: This operation WILL DETROY DATA!"
-       files=$(git ls-files)
-       echo "These files would be deleted:
+       if [ -e "$VCSH_BASE/.gitignore.d/$VCSH_REPO_NAME" ]; then
+               info "'$VCSH_BASE/.gitignore.d/$VCSH_REPO_NAME' differs from new data, moving it to '$VCSH_BASE/.gitignore.d/$VCSH_REPO_NAME.bak'"
+               mv -f "$VCSH_BASE/.gitignore.d/$VCSH_REPO_NAME" "$VCSH_BASE/.gitignore.d/$VCSH_REPO_NAME.bak" ||
+                       fatal "could not move '$VCSH_BASE/.gitignore.d/$VCSH_REPO_NAME' to '$VCSH_BASE/.gitignore.d/$VCSH_REPO_NAME.bak'" 53
+       fi
+       mv -f "$tempfile" "$VCSH_BASE/.gitignore.d/$VCSH_REPO_NAME" ||
+               fatal "could not move '$tempfile' to '$VCSH_BASE/.gitignore.d/$VCSH_REPO_NAME'" 53
+}

 
 

-$files
+debug $(git version)

 
 

-AGAIN, THIS WILL DELETE YOUR DATA!
-To continue, type \"Yes, do as I say\""
-       read answer
-       [ "x$answer" = "xYes, do as I say" ] || exit
-       for file in $files; do
-               rm -f $file || echo "$SELF: info: could not delete '$file', continuing with deletion"
-       done
-       rm -rf "$VCSH_BASE/$REPO_NAME.git" || echo "$SELF: info: could not delete '$VCSH_BASE/$REPO_NAME.git'"
-       cd "$old_dir"
-       verbose "delete end"
+if [ ! "x$VCSH_GITIGNORE" = 'xexact' ] && [ ! "x$VCSH_GITIGNORE" = 'xnone' ] && [ ! "x$VCSH_GITIGNORE" = 'xrecursive' ]; then
+       fatal "'\$VCSH_GITIGNORE' must equal 'exact', 'none', or 'recursive'" 1
+fi
+
+VCSH_COMMAND=$1; export VCSH_COMMAND

 
 

+case $VCSH_COMMAND in
+       clon|clo|cl) VCSH_COMMAND=clone;;
+       commi|comm|com|co) VCSH_COMMAND=commit;;
+       delet|dele|del|de) VCSH_COMMAND=delete;;
+       ente|ent|en) VCSH_COMMAND=enter;;
+       hel|he) VCSH_COMMAND=help;;
+       ini|in) VCSH_COMMAND=init;;
+       pul) VCSH_COMMAND=pull;;
+       pus) VCSH_COMMAND=push;;
+       renam|rena|ren|re) VCSH_COMMAND=rename;;
+       ru) VCSH_COMMAND=run;;
+       statu|stat|sta|st) VCSH_COMMAND=status;;
+       upgrad|upgra|upgr|up) VCSH_COMMAND=upgrade;;
+       versio|versi|vers|ver|ve) VCSH_COMMAND=version;;
+       which|whi|wh) VCSH_COMMAND=which;;
+       write|writ|wri|wr) VCSH_COMMAND=write-gitignore;;
+esac    

 
 

+if [ x"$VCSH_COMMAND" = x'clone' ]; then
+       [ -z "$2" ] && fatal "$VCSH_COMMAND: please specify a remote" 1
+       GIT_REMOTE="$2"
+       [ -n "$3" ] && VCSH_REPO_NAME=$3 || VCSH_REPO_NAME=$(basename "${GIT_REMOTE#*:}" .git)
+       [ -z "$VCSH_REPO_NAME" ] && fatal "$VCSH_COMMAND: could not determine repository name" 1
+       export VCSH_REPO_NAME
+       GIT_DIR=$VCSH_REPO_D/$VCSH_REPO_NAME.git; export GIT_DIR
+elif [ "$VCSH_COMMAND" = 'version' ]; then
+       echo "$SELF $VERSION"
+       git version
+       exit
+elif [ x"$VCSH_COMMAND" = x'which' ]; then
+       [ -z "$2" ] && fatal "$VCSH_COMMAND: please specify a filename" 1
+       [ -n "$3" ] && fatal "$VCSH_COMMAND: too many parameters" 1
+       VCSH_COMMAND_PARAMETER=$2; export VCSH_COMMAND_PARAMETER
+elif [ x"$VCSH_COMMAND" = x'delete' ]           ||
+     [ x"$VCSH_COMMAND" = x'enter' ]            ||
+     [ x"$VCSH_COMMAND" = x'init' ]             ||
+     [ x"$VCSH_COMMAND" = x'list-tracked-by' ]  ||
+     [ x"$VCSH_COMMAND" = x'rename' ]           ||
+     [ x"$VCSH_COMMAND" = x'run' ]              ||
+     [ x"$VCSH_COMMAND" = x'upgrade' ]          ||
+     [ x"$VCSH_COMMAND" = x'write-gitignore' ]; then
+       [ -z "$2" ]                                     && fatal "$VCSH_COMMAND: please specify repository to work on" 1
+       [ x"$VCSH_COMMAND" = x'rename' ] && [ -z "$3" ] && fatal "$VCSH_COMMAND: please specify a target name" 1
+       [ x"$VCSH_COMMAND" = x'run'    ] && [ -z "$3" ] && fatal "$VCSH_COMMAND: please specify a command" 1
+       VCSH_REPO_NAME=$2; export VCSH_REPO_NAME
+       GIT_DIR=$VCSH_REPO_D/$VCSH_REPO_NAME.git; export GIT_DIR
+       [ x"$VCSH_COMMAND" = x'rename' ] && { VCSH_REPO_NAME_NEW=$3; export VCSH_REPO_NAME_NEW;
+                                             GIT_DIR_NEW=$VCSH_REPO_D/$VCSH_REPO_NAME_NEW.git; export GIT_DIR_NEW; }
+       [ x"$VCSH_COMMAND" = x'run' ]    && shift 2
+elif [ x"$VCSH_COMMAND" = x'commit' ] ||
+     [ x"$VCSH_COMMAND" = x'list'   ] ||
+     [ x"$VCSH_COMMAND" = x'list-tracked' ] ||
+     [ x"$VCSH_COMMAND" = x'pull'   ] ||
+     [ x"$VCSH_COMMAND" = x'push'   ]; then
+       :
+elif [ x"$VCSH_COMMAND" = x'status' ]; then
+       VCSH_REPO_NAME=$2; export VCSH_REPO_NAME
+elif [ -n "$2" ]; then
+       VCSH_COMMAND='run'; export VCSH_COMMAND
+       VCSH_REPO_NAME=$1; export VCSH_REPO_NAME
+       GIT_DIR=$VCSH_REPO_D/$VCSH_REPO_NAME.git; export GIT_DIR
+       [ -d "$GIT_DIR" ] || { help; exit 1; }
+       shift 1
+       set -- "git" "$@"
+elif [ -n "$VCSH_COMMAND" ]; then
+       VCSH_COMMAND='enter'; export VCSH_COMMAND
+       VCSH_REPO_NAME=$1; export VCSH_REPO_NAME
+       GIT_DIR=$VCSH_REPO_D/$VCSH_REPO_NAME.git; export GIT_DIR
+       [ -d "$GIT_DIR" ] || { help; exit 1; }

 else
 else

-       verbose "defaulting to calling help()"
-       help
-       exit 3
+       # $1 is empty, or 'help'
+       help && exit
+fi

 
 

+# Did we receive a directory instead of a name?
+# Mangle the input to fit normal operation.
+if echo "$VCSH_REPO_NAME" | grep -q '/'; then
+       GIT_DIR=$VCSH_REPO_NAME; export GIT_DIR
+       VCSH_REPO_NAME=$(basename "$VCSH_REPO_NAME" .git); export VCSH_REPO_NAME

 fi
 
 fi
 

+check_dir() {
+       check_directory="$1"
+       if [ ! -d "$check_directory" ]; then
+               if [ -e "$check_directory" ]; then
+                       fatal "'$check_directory' exists but is not a directory" 13
+               else
+                       verbose "attempting to create '$check_directory'"
+                       mkdir -p "$check_directory" || fatal "could not create '$check_directory'" 50
+               fi
+       fi
+}
+
+check_dir "$VCSH_REPO_D"
+[ ! "x$VCSH_GITIGNORE" = 'xnone' ] && check_dir "$VCSH_BASE/.gitignore.d"
+[ ! "x$VCSH_GITATTRIBUTES" = 'xnone' ] && check_dir "$VCSH_BASE/.gitattributes.d"
+
+verbose "$VCSH_COMMAND begin"
+VCSH_COMMAND=$(echo "$VCSH_COMMAND" | sed 's/-/_/g'); export VCSH_COMMAND
+hook pre-command
+$VCSH_COMMAND "$@"
+hook post-command
+verbose "$VCSH_COMMAND end, exiting"
+exit $VCSH_COMMAND_RETURN_CODE