Merge pull request #183 from ohspite/ff-initial-merge

[code/vcsh.git] / vcsh

diff --git a/vcsh b/vcsh
index d05f26956bc7f55bafb5c0e76db0751303c1b2d8..c30b12d15edcb4bbc2b1dda41b67d3b47c9c5174 100755 (executable)
--- a/vcsh
+++ b/vcsh
@@ -1,32 +1,134 @@
 #!/bin/sh
 
 #!/bin/sh
 

-[ -n "$VCSH_DEBUG" ]      && set -x
-[ -z "$XDG_CONFIG_HOME" ] && XDG_CONFIG_HOME="$HOME/.config"
-[ -z "$VCSH_BASE" ]       && VCSH_BASE="$XDG_CONFIG_HOME/vcsh/repo.d"
+# This program is licensed under the GNU GPL version 2 or later.
+# (c) Richard "RichiH" Hartmann <richih@debian.org>, 2011-2015
+# 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='1.20141026'

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

+fatal() {
+       echo "$SELF: fatal: $1" >&2
+       [ -z $2 ] && exit 1
+       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
+       shift 1
+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"}
+: ${VCSH_OVERLAY_D:="$XDG_CONFIG_HOME/vcsh/overlays-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() {
 help() {

-       echo "usage: $SELF <args>
+       echo "usage: $SELF <options> <command>
+
+   options:
+   -c <file>            Source file
+   -d                   Enable debug mode
+   -v                   Enable verbose mode

 
 

-   clone <remote> \\
+   commands:
+   clone [-b <branch>] \\
+         <remote> \\

          [<repo>]       Clone from an existing repository
          [<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
    help                 Display this help text

-   delete               Delete an existing repository
-   enter                Enter repository; spawn new $SHELL

    init <repo>          Initialize a new repository
    list                 List all repositories
    init <repo>          Initialize a new repository
    list                 List all repositories

+   list-tracked \\
+        [<repo>]        List all files tracked all or one repositories
+   list-untracked \\
+        [<-r>] [<repo>] List all files not tracked by all or one repositories
+   pull                 Pull from all vcsh remotes
+   push                 Push to vcsh remotes

    rename <repo> \\
           <newname>     Rename repository
    run <repo> \\
        <command>        Use this repository
    rename <repo> \\
           <newname>     Rename repository
    run <repo> \\
        <command>        Use this repository

+   status \\
+     [--terse] [<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

 
 

-   seed-gitignore \\
-   <repo>               Seed .gitignore.d/<repo> from git ls-files
-   setup                Set up repository with recommended settings
-
-   <repo> <git command> Special command that allows you to run git commands
-                        directly without having to type so much ;)" >&2
+   <repo> <git command> Shortcut to run git commands directly
+   <repo>               Shortcut to enter repository" >&2

 }
 
 debug() {
 }
 
 debug() {


@@ -37,11 +139,6 @@ verbose() {
        if [ -n "$VCSH_DEBUG" ] || [ -n "$VCSH_VERBOSE" ]; then echo "$SELF: verbose: $@"; fi
 }
 
        if [ -n "$VCSH_DEBUG" ] || [ -n "$VCSH_VERBOSE" ]; then echo "$SELF: verbose: $@"; fi
 }
 

-fatal() {
-       echo "$SELF: fatal: $1" >&2
-       exit $2
-}
-

 error() {
        echo "$SELF: error: $1" >&2
 }
 error() {
        echo "$SELF: error: $1" >&2
 }


@@ -51,192 +148,480 @@ info() {
 }
 
 clone() {
 }
 
 clone() {

+       hook pre-clone

        init
        git remote add origin "$GIT_REMOTE"
        init
        git remote add origin "$GIT_REMOTE"

-       git config branch.master.remote origin
-       git config branch.master.merge  refs/heads/master
-       git fetch
-       for object in $(git ls-tree -r origin/master | awk '{print $4}'); do
+       git checkout -b "$VCSH_BRANCH" || return $?
+       git config branch."$VCSH_BRANCH".remote origin
+       git config branch."$VCSH_BRANCH".merge  refs/heads/"$VCSH_BRANCH"
+       if [ $(git ls-remote origin "$VCSH_BRANCH" 2> /dev/null | wc -l ) -lt 1 ]; then
+               info "remote is empty, not merging anything.
+  You should add files to your new repository."
+               exit
+       fi
+       git fetch origin "$VCSH_BRANCH"
+       hook pre-merge
+       git ls-tree -r --name-only origin/"$VCSH_BRANCH" | (while read object; do

                [ -e "$object" ] &&
                        error "'$object' exists." &&
                [ -e "$object" ] &&
                        error "'$object' exists." &&

-                       VCSH_CONFLICT=1;
+                       VCSH_CONFLICT=1

        done
        done

-       [ "$VCSH_CONFLICT" = '1' ] &&
+       [ x"$VCSH_CONFLICT" = x'1' ]) &&

                fatal "will stop after fetching and not try to merge!
                fatal "will stop after fetching and not try to merge!

-  Once this situation has been resolved, run 'vcsh run $VCSH_REPO_NAME git pull' to finish cloning.\n" 17
-       git merge origin/master
+  Once this situation has been resolved, run 'vcsh $VCSH_REPO_NAME pull' to finish cloning." 17
+       git -c merge.ff=true merge origin/"$VCSH_BRANCH"
+       hook post-merge
+       hook post-clone
+       retire
+       hook post-clone-retired
+}
+
+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

 }
 
 delete() {
 }
 
 delete() {

-       cd "$HOME" || fatal "could not enter '$HOME'" 11
+       cd "$VCSH_BASE" || fatal "could not enter '$VCSH_BASE'" 11

        use
        use

-       info "This operation WILL DETROY DATA!"
+       info "This operation WILL DESTROY DATA!"

        files=$(git ls-files)
        echo "These files will be deleted:
 
 $files
 
 AGAIN, THIS WILL DELETE YOUR 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\""
+To continue, type 'Yes, do as I say'"

        read answer
        read answer

-       [ "x$answer" = "xYes, do as I say" ] || exit 16
+       [ "x$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
        for file in $files; do
                rm -f $file || info "could not delete '$file', continuing with deletion"
        done

-       rmdir "$GIT_DIR" || error "could not delete '$GIT_DIR'"
+       rm -rf "$GIT_DIR" || error "could not delete '$GIT_DIR'"

 }
 
 enter() {
 }
 
 enter() {

+       hook pre-enter

        use
        $SHELL
        use
        $SHELL

+       hook post-enter

 }
 
 git_dir_exists() {
        [ -d "$GIT_DIR" ] || fatal "no repository found for '$VCSH_REPO_NAME'" 12
 }
 
 }
 
 git_dir_exists() {
        [ -d "$GIT_DIR" ] || fatal "no repository found for '$VCSH_REPO_NAME'" 12
 }
 

+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() {

+       hook pre-init

        [ ! -e "$GIT_DIR" ] || fatal "'$GIT_DIR' exists" 10
        [ ! -e "$GIT_DIR" ] || fatal "'$GIT_DIR' exists" 10

-       export GIT_WORK_TREE="$HOME"
-       mkdir -p "$GIT_WORK_TREE" || fatal "could not create '$GIT_WORK_TREE'" 50
-       cd "$GIT_WORK_TREE" || fatal "could not enter '$GIT_WORK_TREE'" 11
-       git init
-       setup
+       mkdir -p "$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() {
 }
 
 list() {

-       for i in "$VCSH_BASE"/*.git; do
-               echo $(basename "$i" .git)
+       for repo in "$VCSH_REPO_D"/*.git; do
+               [ -d "$repo" ] && [ -r "$repo" ] && echo "$(basename "$repo" .git)"

        done
 }
 
        done
 }
 

-#get_files() {
-#      return $(git ls-files)
-#}
-#
-#list_tracked_all() {
-#      use
-#      for repo in $(list); do
-#              files="$files $(get_files $repo)"
-#      done
-#      echo $files | sort -u
-#}
+get_files() {
+       GIT_DIR=$VCSH_REPO_D/$VCSH_REPO_NAME.git; export GIT_DIR
+       git ls-files
+}
+
+list_tracked() {
+       VCSH_REPO_NAME=$2; export VCSH_REPO_NAME
+       if [ -n "$VCSH_REPO_NAME" ]; then
+               get_files | list_tracked_helper
+       else
+               for VCSH_REPO_NAME in $(list); do
+                       get_files
+               done | list_tracked_helper
+       fi
+}
+
+list_tracked_helper() {
+       sed "s,^,$(printf '%s\n' "$VCSH_BASE/" | sed 's/[,\&]/\\&/g')," | sort -u
+}
+
+list_tracked_by() {
+       list_tracked '' $2
+}
+
+list_untracked() {
+       command -v 'comm' >/dev/null 2>&1 || fatal "Could not find 'comm'"
+
+       temp_file_others=$(mktemp "${TMPDIR:-/tmp}/tmp.XXXXXXXXXX") || fatal 'Could not create temp file'
+       temp_file_untracked=$(mktemp "${TMPDIR:-/tmp}/tmp.XXXXXXXXXX") || fatal 'Could not create temp file'
+       temp_file_untracked_copy=$(mktemp "${TMPDIR:-/tmp}/tmp.XXXXXXXXXX") || fatal 'Could not create temp file'
+
+       # Hack in support for `vcsh list-untracked -r`...
+       directory_opt="--directory"
+       shift 1
+       while getopts "r" flag; do
+               if [ x"$1" = x'-r' ]; then
+                       unset directory_opt
+               fi
+               shift 1
+       done
+       # ...and parse for a potential parameter afterwards. As we shifted things out of $* in during getops, we need to look at $1
+       VCSH_REPO_NAME=$1; export VCSH_REPO_NAME
+
+       if [ -n "$VCSH_REPO_NAME" ]; then
+               list_untracked_helper $VCSH_REPO_NAME
+       else
+               for VCSH_REPO_NAME in $(list); do
+                       list_untracked_helper $VCSH_REPO_NAME
+               done
+       fi
+       cat $temp_file_untracked
+
+       unset directory_opt directory_component
+       rm -f $temp_file_others $temp_file_untracked $temp_file_untracked_copy || fatal 'Could not delete temp files'
+}
+
+list_untracked_helper() {
+       export GIT_DIR="$VCSH_REPO_D/$VCSH_REPO_NAME.git"
+       git ls-files --others "$directory_opt" | (
+               while read line; do
+                       echo "$line"
+                       directory_component=${line%%/*}
+                       [ -d "$directory_component" ] && printf '%s/\n' "$directory_component"
+               done
+               ) | sort -u > $temp_file_others
+       if [ -z "$ran_once" ]; then
+               ran_once=1
+               cp $temp_file_others $temp_file_untracked || fatal 'Could not copy temp file'
+       fi
+       cp $temp_file_untracked $temp_file_untracked_copy || fatal 'Could not copy temp file'
+       comm -12 $temp_file_others $temp_file_untracked_copy > $temp_file_untracked
+}
+
+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
+       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
 
 
 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

 }
 
 run() {
 }
 
 run() {

+       hook pre-run

        use
        use

-       $VCSH_EXTERNAL_COMMAND
+       "$@"
+       VCSH_COMMAND_RETURN_CODE=$?
+       hook post-run
+}
+
+status() {
+       if [ -t 1 ]; then
+               COLORING="-c color.status=always"
+       fi
+       if [ -n "$VCSH_REPO_NAME" ]; then
+               status_helper $VCSH_REPO_NAME
+       else
+               for VCSH_REPO_NAME in $(list); do
+                       STATUS=$(status_helper $VCSH_REPO_NAME "$COLORING")
+                       [ -n "$STATUS" -o -z "$VCSH_STATUS_TERSE" ] && echo "$VCSH_REPO_NAME:"
+                       [ -n "$STATUS" ]            && echo "$STATUS"
+                       [ -z "$VCSH_STATUS_TERSE" ] && echo
+               done
+       fi

 }
 
 }
 

-seed_gitignore() {
+status_helper() {
+       GIT_DIR=$VCSH_REPO_D/$1.git; export GIT_DIR
+       VCSH_GIT_OPTIONS=$2

        use
        use

-       cd "$HOME" || fatal "could not enter '$HOME'" 11
+       remote_tracking_branch=$(git rev-parse --abbrev-ref --symbolic-full-name @{u} 2> /dev/null) && {
+               commits_behind=$(git log ..${remote_tracking_branch} --oneline | wc -l)
+               commits_ahead=$(git log ${remote_tracking_branch}.. --oneline | wc -l)
+               [ ${commits_behind} -ne 0 ] && echo "Behind $remote_tracking_branch by $commits_behind commits"
+               [ ${commits_ahead} -ne 0 ] && echo "Ahead of $remote_tracking_branch by $commits_ahead commits"
+       }
+       git ${VCSH_GIT_OPTIONS} status --short --untracked-files='no'
+       VCSH_COMMAND_RETURN_CODE=$?
+}
+
+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() {
+       output=$(for VCSH_REPO_NAME in $(list); do
+               get_files | grep -- "$VCSH_COMMAND_PARAMETER" | sed "s/^/$VCSH_REPO_NAME: /"
+       done | sort -u)
+       if [ -z "$output" ]; then
+               fatal "'$VCSH_COMMAND_PARAMETER' does not exist" 1
+       else
+               echo "$output"
+       fi
+}
+
+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 | sort -u)
                done;
        done | sort -u)

-       tempfile=$(mktemp) || fatal "could not create tempfile" 51
+
+       # 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 $gitignores; do
        echo '*' > "$tempfile" || fatal "could not write to '$tempfile'" 57
        for gitignore in $gitignores; do

-               echo "$gitignore" | sed 's/^/!/' >> "$tempfile" || fatal "could not write to '$tempfile'" 57
-               [ -d "$gitignore" ] && { echo "$gitignore/*" | sed 's/^/!/' >> "$tempfile" || fatal "could not write to '$tempfile'" 57; }
+               echo "$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

-       if diff -N "$tempfile" "$HOME/.gitignore.d/$VCSH_REPO_NAME" > /dev/null; then
+       IFS=$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
                rm -f "$tempfile" || error "could not delete '$tempfile'"
                exit
        fi

-       if [ -e "$HOME/.gitignore.d/$VCSH_REPO_NAME" ]; then
-               info "'$HOME/.gitignore.d/$VCSH_REPO_NAME' differs from new data, moving it to '$HOME/.gitignore.d/$VCSH_REPO_NAME.bak'"
-               mv -f "$HOME/.gitignore.d/$VCSH_REPO_NAME" "$HOME/.gitignore.d/$VCSH_REPO_NAME.bak" ||
-                       fatal "could not move '$HOME/.gitignore.d/$VCSH_REPO_NAME' to '$HOME/.gitignore.d/$VCSH_REPO_NAME.bak'" 53
+       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
        fi

-       mv -f "$tempfile" "$HOME/.gitignore.d/$VCSH_REPO_NAME" ||
-               fatal "could not move '$tempfile' to '$HOME/.gitignore.d/$VCSH_REPO_NAME'" 53
+       mv -f "$tempfile" "$VCSH_BASE/.gitignore.d/$VCSH_REPO_NAME" ||
+               fatal "could not move '$tempfile' to '$VCSH_BASE/.gitignore.d/$VCSH_REPO_NAME'" 53

 }
 
 }
 

-setup() {
-       use
-       git config core.worktree     "$GIT_WORK_TREE"
-       git config core.excludesfile ".gitignore.d/$VCSH_REPO_NAME"
-       git config vcsh.vcsh         'true'
-       [ -e "$HOME/.gitignore.d/$VCSH_REPO_NAME" ] && git add -f "$HOME/.gitignore.d/$VCSH_REPO_NAME"
-}
+debug $(git version)

 
 

-use() {
-       git_dir_exists
-       export GIT_WORK_TREE="$(git config --get core.worktree)"
-       export VCSH_DIRECTORY="$VCSH_REPO_NAME"
-}
+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

 
 

-if [ "$1" = 'clone' ]; then
-       [ -z $2 ] && fatal "$1: please specify a remote" 1
-       export VCSH_COMMAND="$1"
+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
+       VCSH_BRANCH=
+       if [ "$2" = -b ]; then
+               VCSH_BRANCH=$3
+               shift
+               shift
+       fi
+       [ -z "$2" ] && fatal "$VCSH_COMMAND: please specify a remote" 1

        GIT_REMOTE="$2"
        GIT_REMOTE="$2"

-       [ -n "$3" ] && VCSH_REPO_NAME="$3" || VCSH_REPO_NAME=$(basename "$GIT_REMOTE" .git)
+       [ -n "$VCSH_BRANCH" ] || if [ "$3" = -b ]; then
+               VCSH_BRANCH=$4
+               shift
+               shift
+       fi
+       if [ -n "$3" ]; then
+               VCSH_REPO_NAME=$3
+               [ -z "$VCSH_BRANCH" ] && [ "$4" = -b ] && VCSH_BRANCH=$5
+       else
+               VCSH_REPO_NAME=$(basename "${GIT_REMOTE#*:}" .git)
+       fi
+       [ -z "$VCSH_REPO_NAME" ] && fatal "$VCSH_COMMAND: could not determine repository name" 1

        export VCSH_REPO_NAME
        export VCSH_REPO_NAME

-       export GIT_DIR="$VCSH_BASE/$VCSH_REPO_NAME.git"
-elif [ "$1" = 'delete' ] ||
-     [ "$1" = 'enter' ] ||
-     [ "$1" = 'init' ] ||
-     [ "$1" = 'list-tracked-all' ] ||
-     [ "$1" = 'rename' ] ||
-     [ "$1" = 'run' ] ||
-     [ "$1" = 'seed-gitignore' ] ||
-     [ "$1" = 'setup' ]; then
-       [ -z $2 ]                      && fatal "$1: please specify repository to work on" 1
-       [ "$1" = 'rename' -a -z "$3" ] && fatal "$1: please specify a target name" 1
-       [ "$1" = 'run' -a -z "$3" ]    && fatal "$1: please specify a command" 1
-       export VCSH_COMMAND="$1"
-       export VCSH_REPO_NAME="$2"
-       export GIT_DIR="$VCSH_BASE/$VCSH_REPO_NAME.git"
-       [ "$VCSH_COMMAND" = 'rename' ]         && export GIT_DIR_NEW="$VCSH_BASE/$3.git"
-       if [ "$VCSH_COMMAND" = 'run' ]; then
-               shift 2
-               export VCSH_EXTERNAL_COMMAND="$*"
-               # Did we receive a directory instead of a name? Mangle the input to fit normal operation!
-               if echo $VCSH_REPO_NAME | grep -q '/'; then
-                       export GIT_DIR=$VCSH_REPO_NAME
-                       export VCSH_REPO_NAME=$(basename $VCSH_REPO_NAME .git)
-               fi
+       [ -n "$VCSH_BRANCH" ] || VCSH_BRANCH=master
+       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'list-untracked' ] ||
+     [ x"$VCSH_COMMAND" = x'pull'   ] ||
+     [ x"$VCSH_COMMAND" = x'push'   ]; then
+       :
+elif [ x"$VCSH_COMMAND" = x'status' ]; then
+       if [ x"$2" = x'--terse' ]; then
+               VCSH_STATUS_TERSE=1; export VCSH_STATUS_TERSE
+               shift

        fi
        fi

-       [ "$VCSH_COMMAND" = 'seed-gitignore' ]
-#      [ "$VCSH_COMMAND" = 'seed-gitignore' ] && export VCSH_COMMAND='seed_gitignore'
-elif [ "$1" = 'list' ]; then
-       export VCSH_COMMAND="$1"
-elif [ -n "$1" ]; then
-       export VCSH_COMMAND=run
-       export VCSH_REPO_NAME="$1"
-       export GIT_DIR="$VCSH_BASE/$VCSH_REPO_NAME.git"
-       [ -d $GIT_DIR ] || { help; exit 1; }
+       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
        shift 1

-       export VCSH_EXTERNAL_COMMAND="git $*"
+       set -- "git" "$@"
+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
        # $1 is empty, or 'help'
        help && exit
 fi
 
 else
        # $1 is empty, or 'help'
        help && exit
 fi
 

-for check_directory in "$VCSH_BASE" "$HOME/.gitignore.d"
-do
+# 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
+
+check_dir() {
+       check_directory="$1"

        if [ ! -d "$check_directory" ]; then
                if [ -e "$check_directory" ]; then
                        fatal "'$check_directory' exists but is not a directory" 13
                else
        if [ ! -d "$check_directory" ]; then
                if [ -e "$check_directory" ]; then
                        fatal "'$check_directory' exists but is not a directory" 13
                else

-                       info "attempting to create '$check_directory'"
+                       verbose "attempting to create '$check_directory'"

                        mkdir -p "$check_directory" || fatal "could not create '$check_directory'" 50
                fi
        fi
                        mkdir -p "$check_directory" || fatal "could not create '$check_directory'" 50
                fi
        fi

-done
+}
+
+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"
 
 verbose "$VCSH_COMMAND begin"

-export VCSH_COMMAND=$(echo $VCSH_COMMAND | sed 's/-/_/g')
-$VCSH_COMMAND
+VCSH_COMMAND=$(echo "$VCSH_COMMAND" | sed 's/-/_/g'); export VCSH_COMMAND
+
+# Source repo-specific configuration file
+[ -r "$XDG_CONFIG_HOME/vcsh/config.d/$VCSH_REPO_NAME" ] && . "$XDG_CONFIG_HOME/vcsh/config.d/$VCSH_REPO_NAME"
+
+# source overlay functions
+for overlay in "$VCSH_OVERLAY_D/$VCSH_COMMAND"* "$VCSH_OVERLAY_D/$VCSH_REPO_NAME.$VCSH_COMMAND"*; do
+       [ -r "$overlay" ] || continue
+       info "sourcing '$overlay'"
+       . "$overlay"
+done
+
+hook pre-command
+$VCSH_COMMAND "$@"
+hook post-command

 verbose "$VCSH_COMMAND end, exiting"
 verbose "$VCSH_COMMAND end, exiting"

+exit $VCSH_COMMAND_RETURN_CODE