]> git.madduck.net Git - code/vcsh.git/blobdiff - vcsh

madduck's git repository

Every one of the projects in this repository is available at the canonical URL git://git.madduck.net/madduck/pub/<projectpath> — see each project's metadata for the exact URL.

All patches and comments are welcome. Please squash your changes to logical commits before using git-format-patch and git-send-email to patches@git.madduck.net. If you'd read over the Git project's submission guidelines and adhered to them, I'd be especially grateful.

SSH access, as well as push access can be individually arranged.

If you use my repositories frequently, consider adding the following snippet to ~/.gitconfig and using the third clone URL listed for each project:

[url "git://git.madduck.net/madduck/"]
  insteadOf = madduck:

.mailmap: Add mapping for Alexander Skurikhin
[code/vcsh.git] / vcsh
diff --git a/vcsh b/vcsh
index c05210d2b67e83e0ec43c5972748d747fcc96232..e64ca0b936247983b4f203cd6f283f553070d322 100755 (executable)
--- a/vcsh
+++ b/vcsh
 #!/bin/sh
 
 #!/bin/sh
 
-[ -n "$VCSH_DEBUG" ]      && set -x
-[ -z "$XDG_CONFIG_HOME" ] && XDG_CONFIG_HOME="$HOME/.config"
-[ -z "$VCSH_BASE" ]       && VCSH_BASE="$XDG_CONFIG_HOME/vcsh/repo.d"
+# This program is licensed under the GNU GPL version 2 or later.
+# (c) Richard "RichiH" Hartmann <richih.mailinglist@gmail.com>, 2011-2013
+# For details, see LICENSE. To submit patches, you have to agree to
+# license your code under the GNU GPL version 2 or later.
+
+# While the following is not legally binding, the author would like to
+# explain the choice of GPLv2+ over GPLv3+.
+# The author prefers GPLv3+ over GPLv2+ but feels it's better to maintain
+# full compatibility's with git. In case git ever changes its licensing terms,
+# which is admittedly extremely unlikely to the point of being impossible,
+# this software will most likely follow suit.
+
+# This should always be the first line of code to facilitate debugging
+[ -n "$VCSH_DEBUG" ] && set -vx
+
+basename() {
+       # Implemented in shell to avoid spawning another process
+       local file
+       file="${1##*/}"
+       [ -z "$2" ] || file="${file%$2}"
+       echo "$file"
+}
 
 SELF=$(basename $0)
 
 SELF=$(basename $0)
-if [ "$SELF" = 'bash' ] ||
-   [ "$SELF" = 'dash' ] ||
-   [ "$SELF" = 'sh' ] ||
-   [ "$SELF" = 'zsh' ]; then
-       SELF='vcsh'
-       VCSH_SOURCED=1
+VERSION='1.20130614'
+
+fatal() {
+       echo "$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 [ "$1" = '-d' ] || [ "$1" = '--debug' ]; then
+               set -vx
+               VCSH_DEBUG=1
+               echo "$SELF $VERSION"
+       elif [ "$1" = '-v' ];then
+               VCSH_VERBOSE=1
+               echo "$SELF $VERSION"
+       elif [ "$1" = '-c' ];then
+               VCSH_OPTION_CONFIG=$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
+[ -z "$XDG_CONFIG_HOME" ]             && XDG_CONFIG_HOME="$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
 fi
+[ -n "$VCSH_DEBUG" ]                  && set -vx
+
+# Read defaults
+[ -z "$VCSH_REPO_D" ]                 && VCSH_REPO_D="$XDG_CONFIG_HOME/vcsh/repo.d"
+[ -z "$VCSH_HOOK_D" ]                 && VCSH_HOOK_D="$XDG_CONFIG_HOME/vcsh/hooks-enabled"
+[ -z "$VCSH_BASE" ]                   && VCSH_BASE="$HOME"
+[ -z "$VCSH_GITIGNORE" ]              && VCSH_GITIGNORE='exact'
 
 
 help() {
 
 
 help() {
-       echo "usage: $SELF <args>
+       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
    clone <remote> \\
          [<repo>]       Clone from an existing repository
+   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
-   exit                 Exit repository; unset ENV
    init <repo>          Initialize a new repository
    list                 List all repositories
    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
    run <repo> \\
        <command>        Use this repository
-
-   seed-gitignore \\
-   <repo>               Seed .gitignore.d/<repo> from git ls-files
-   setup                Set up repository with recommended settings
-   use <repo>           Use repository; set ENV
-
-   <repo> <git command> Special command that allows you to run git commands
-                        directly without having to type so much ;)" >&2
+   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() {
@@ -45,194 +124,169 @@ 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
 }
 
-setup() {
-       git config core.worktree     "$GIT_WORK_TREE"
-       git config core.excludesfile ".gitignore.d/$VCSH_REPO_NAME"
-       git config vcsh.vcsh         'true'
-       touch   "$HOME/.gitignore.d/$VCSH_REPO_NAME"
-       git add "$HOME/.gitignore.d/$VCSH_REPO_NAME"
-}
-
-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" &&
-                return 1) || return $?
-       cd "$GIT_WORK_TREE"
-       git init
-       setup
-       verbose "init() end"
-}
-
-leave() {
-       unset GIT_DIR
-       unset GIT_WORK_TREE
-       unset VCSH_DIRECTORY
+error() {
+       echo "$SELF: error: $1" >&2
 }
 
 }
 
-use() {
-       verbose "use() begin"
-       if [ ! -d "$GIT_DIR" ]; then
-               echo E: no repository found for "$VCSH_REPO_NAME" >&2
-               return 1
-       fi
-       export GIT_DIR
-       export GIT_WORK_TREE="$(git config --get core.worktree)"
-       export VCSH_DIRECTORY="$VCSH_REPO_NAME"
-       verbose "use() end"
+info() {
+       echo "$SELF: info: $1"
 }
 
 }
 
-
-if [ "$1" = 'clone' ]; then
-       export VCSH_COMMAND="$1"
-       GIT_REMOTE="$2"
-       export GIT_REMOTE
-       VCSH_REPO_NAME="$3"
-       [ -z "$VCSH_REPO_NAME" ] && VCSH_REPO_NAME=$(basename "$GIT_REMOTE" .git)
-       export VCSH_REPO_NAME
-       export GIT_DIR="$VCSH_BASE/$VCSH_REPO_NAME.git"
-elif [ "$1" = 'delete' ] ||
-     [ "$1" = 'enter' ] ||
-     [ "$1" = 'init' ] ||
-     [ "$1" = 'run' ] ||
-     [ "$1" = 'seed-gitignore' ] ||
-     [ "$1" = 'setup' ] ||
-     [ "$1" = 'use' ]; then
-       [ -z $2 ] && echo "$SELF $1: error: please specify repository to work on" && return 1
-       export VCSH_COMMAND="$1"
-       export VCSH_REPO_NAME="$2"
-       export GIT_DIR="$VCSH_BASE/$VCSH_REPO_NAME.git"
-       shift 2
-       export VCSH_EXTERNAL_COMMAND="$*"
-       if [ "$VCSH_COMMAND" = 'run' ]; then
-               [ -z "$VCSH_EXTERNAL_COMMAND" ] && echo "$SELF $1 $2: error: please specify a command" && return 1
-       fi
-elif [ "$1" = 'exit' ] ||
-     [ "$1" = 'help' ] ||
-     [ "$1" = 'list' ]; then
-       export VCSH_COMMAND="$1"
-else
-       [ -z $1 ] && help && return 0
-       export VCSH_COMMAND='run'
-       export VCSH_REPO_NAME="$1"
-       export GIT_DIR="$VCSH_BASE/$VCSH_REPO_NAME.git"
-       [ -d $GIT_DIR ] || (help && return 1) || return 0
-       shift 1
-       export VCSH_EXTERNAL_COMMAND="git $*"
-fi
-
-
-for check_directory in "$VCSH_BASE" "$HOME/.gitignore.d"
-do
-       if [ ! -d "$check_directory" ]; then
-               if [ -e "$check_directory" ]; then
-                       echo "$SELF: error: $check_directory exists but is not a directory" >&2
-                       return 2
-               else
-                       echo "$SELF: info: attempting to create $check_directory"
-                       mkdir -p "$check_directory" || (echo "$SELF: error: could not create $check_directory" >&2; return 2) || return $?
-               fi
-       fi
-done
-
-
-if [ "$VCSH_COMMAND" = 'clone' ]; then
-       verbose "clone begin"
+clone() {
+       hook pre-clone
        init
        git remote add origin "$GIT_REMOTE"
        git config branch.master.remote origin
        git config branch.master.merge  refs/heads/master
        init
        git remote add origin "$GIT_REMOTE"
        git config branch.master.remote origin
        git config branch.master.merge  refs/heads/master
+       if [ $(git ls-remote origin master 2> /dev/null | wc -l ) -lt 1 ]; then
+               info "remote is empty, not merging anything"
+               exit
+       fi
        git fetch
        for object in $(git ls-tree -r origin/master | awk '{print $4}'); do
                [ -e "$object" ] &&
        git fetch
        for object in $(git ls-tree -r origin/master | awk '{print $4}'); do
                [ -e "$object" ] &&
-                       echo "$SELF: error: $object exists." &&
+                       error "'$object' exists." &&
                        VCSH_CONFLICT=1;
        done
        [ "$VCSH_CONFLICT" = '1' ] &&
                        VCSH_CONFLICT=1;
        done
        [ "$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" &&
-               return 3
+               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
        git merge origin/master
-#      use || return $?
-       verbose "clone end"
-
-#elif [ "$VCSH_COMMAND" = 'help' ] || [ "$#" -eq 0 ]; then
-elif [ "$VCSH_COMMAND" = 'help' ]; then
-       help
-
-elif [ "$VCSH_COMMAND" = 'delete' ]; then
-       verbose "delete begin"
-       old_dir="$PWD"
-       cd "$HOME"
-       use || return $?
-       echo "$SELF: info: This operation WILL DETROY DATA!"
+       hook post-clone
+}
+
+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!
        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$answer" = "xYes, do as I say" ] || return 1
+       [ "x$answer" = 'xYes, do as I say' ] || exit 16
        for file in $files; do
        for file in $files; do
-               rm -f $file || echo "$SELF: info: could not delete '$file', continuing with deletion"
+               rm -f $file || info "could not delete '$file', continuing with deletion"
        done
        done
-       rm -rf "$GIT_DIR" || echo "$SELF: info: could not delete '$GIT_DIR'"
-       cd "$old_dir"
-       verbose "delete end"
+       rm -rf "$GIT_DIR" || error "could not delete '$GIT_DIR'"
+}
 
 
-elif [ "$VCSH_COMMAND" = 'enter' ]; then
-       verbose "enter begin"
-       use || return $?
+enter() {
+       hook pre-enter
+       use
        $SHELL
        $SHELL
-       leave
-       verbose "enter end"
-
-elif [ "$VCSH_COMMAND" = '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
-       [ -z "$VCSH_SOURCED" ] && echo "$SELF $VCSH_COMMAND: You need to source vcsh if you want to run in this mode" && return 10
-       leave
-#      [ -n "$ZSH_VERSION" ] && [ "$USER" = richih ] && buildPS1
-       verbose "exit end"
-       return 0
-
-elif [ "$VCSH_COMMAND" = 'init' ]; then
-       verbose "init begin"
-       init
-#      use || return $?
-       verbose "init end"
+       hook post-enter
+}
 
 
-elif [ "$VCSH_COMMAND" = 'list' ]; then
-       verbose "list begin"
-       for i in "$VCSH_BASE"/*.git; do
-               echo $(basename "$i" .git)
+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
        done
-       verbose "list end"
-
-elif [ "$VCSH_COMMAND" = 'run' ]; then
-       verbose "run begin"
-       use || return $?
-       $VCSH_EXTERNAL_COMMAND
-       leave
-       verbose "run end"
-
-elif [ "$VCSH_COMMAND" = 'seed-gitignore' ]; then
-       verbose "seed-gitignore begin"
-       use || return $?
-       # 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 "$HOME"
+}
+
+init() {
+       [ ! -e "$GIT_DIR" ] || fatal "'$GIT_DIR' exists" 10
+       export GIT_WORK_TREE="$VCSH_BASE"
+       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
+       upgrade
+}
+
+list() {
+       for repo in "$VCSH_REPO_D"/*.git; do
+               [ -d "$repo" ] && [ -r "$repo" ] && echo $(basename "$repo" .git)
+       done
+}
+
+get_files() {
+       export GIT_DIR="$VCSH_REPO_D/$VCSH_REPO_NAME.git"
+       git ls-files
+}
+
+list_tracked() {
+       for VCSH_REPO_NAME in $(list); do
+               get_files
+       done | sort -u
+}
+
+list_tracked_by() {
+       use
+       git ls-files | sort -u
+}
+
+pull() {
+       hook pre-pull
+       for VCSH_REPO_NAME in $(list); do
+               echo -n "$VCSH_REPO_NAME: "
+               export GIT_DIR="$VCSH_REPO_D/$VCSH_REPO_NAME.git"
+               use
+               git pull
+       done
+       hook post-pull
+}
+
+push() {
+       hook pre-push
+       for VCSH_REPO_NAME in $(list); do
+               echo -n "$VCSH_REPO_NAME: "
+               export GIT_DIR="$VCSH_REPO_D/$VCSH_REPO_NAME.git"
+               use
+               git push
+       done
+       hook post-push
+}
+
+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
+
+}
+
+run() {
+       hook pre-run
+       use
+       "$@"
+       hook post-run
+}
+
+upgrade() {
+       hook pre-upgrade
+       use
+       git config core.worktree     "$GIT_WORK_TREE"
+       git config core.excludesfile ".gitignore.d/$VCSH_REPO_NAME"
+       git config vcsh.vcsh         'true'
+       [ -e "$VCSH_BASE/.gitignore.d/$VCSH_REPO_NAME" ] && git add -f "$VCSH_BASE/.gitignore.d/$VCSH_REPO_NAME"
+       hook post-upgrade
+}
+
+use() {
+       git_dir_exists
+       export GIT_WORK_TREE="$(git config --get core.worktree)"
+       export VCSH_DIRECTORY="$VCSH_REPO_NAME"
+}
+
+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: $VCSH_FILE"
+               done
+       done | sort -u
+}
+
+write_gitignore() {
+       use
+       cd "$VCSH_BASE" || fatal "could not enter '$VCSH_BASE'" 11
        gitignores=$(for file in $(git ls-files); do
                while true; do
                        echo $file; new="${file%/*}"
        gitignores=$(for file in $(git ls-files); do
                while true; do
                        echo $file; new="${file%/*}"
@@ -240,57 +294,108 @@ elif [ "$VCSH_COMMAND" = 'seed-gitignore' ]; then
                        file="$new"
                done;
        done | sort -u)
                        file="$new"
                done;
        done | sort -u)
-       tempfile=$(mktemp) ||
-               (echo "$SELF: fatal: could not create tempfile" && return 1) || return $?
-       echo '*' > "$tempfile"
+       tempfile=$(mktemp) || fatal "could not create tempfile" 51
+       echo '*' > "$tempfile" || fatal "could not write to '$tempfile'" 57
        for gitignore in $gitignores; do
        for gitignore in $gitignores; do
-               echo "$gitignore" | sed 's/^/!/' >> "$tempfile"
-               [ -d "$gitignore" ] && echo "$gitignore/*" | sed 's/^/!/'>> "$tempfile"
+               echo "$gitignore" | sed 's@^@!/@' >> "$tempfile" || fatal "could not write to '$tempfile'" 57
+               if [ x$VCSH_GITIGNORE = x'recursive' ] && [ -d "$gitignore" ]; then
+                       { echo "$gitignore/*" | sed 's@^@!/@' >> "$tempfile" || fatal "could not write to '$tempfile'" 57; }
+               fi
        done
        done
-       diff -N "$tempfile" "$HOME/.gitignore.d/$VCSH_REPO_NAME" > /dev/null &&
-               rm -f "$tempfile" &&
-               return
-       if [ -e "$HOME/.gitignore.d/$VCSH_REPO_NAME" ]; then
-               echo "$SELF: 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" ||
-                       (echo "$SELF: fatal: could not move $HOME/.gitignore.d/$VCSH_REPO_NAME to $HOME/.gitignore.d/$VCSH_REPO_NAME.bak" &&
-                        return 1) || return $?
+       if diff -N "$tempfile" "$VCSH_BASE/.gitignore.d/$VCSH_REPO_NAME" > /dev/null; then
+               rm -f "$tempfile" || error "could not delete '$tempfile'"
+               exit
+       fi
+       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/$VCSH_REPO_NAME" ||
-               (echo "$SELF: fatal: could not move $tempfile to $HOME/.gitignore.d/$VCSH_REPO_NAME" && return 1) || return $?
-       cd "$old_dir"
-       verbose "seed-gitignore end"
-
-elif [ "$VCSH_COMMAND" = 'setup' ]; then
-       verbose "seed-gitignore begin"
-       use   || return $?
-       setup || return $?
-       leave
-       verbose "seed-gitignore end"
-
-elif [ "$VCSH_COMMAND" = 'use' ]; then
-       verbose "use begin"
-#      if [ -n "$ZSH_VERSION" ]; then
-#              if [ -o NO_IGNORE_EOF ]; then
-#                      export VCSH_NO_IGNORE_EOF=1
-#                      setopt IGNORE_EOF
-#              fi
-#              vcsh_exit() {
-#                      vcsh exit;
-#                      zle reset-prompt;
-#              }
-#              zle -N vcsh_exit
-#              bindkey '^d' 'vcsh_exit'
-#      fi
-       [ -z "$VCSH_SOURCED" ] && echo "$SELF $VCSH_COMMAND: You need to source vcsh if you want to run in this mode" && return 10
-       use || return $?
-#      [ -n "$ZSH_VERSION" ] && [ "$USER" = richih ] && buildPS1
-       verbose "use end"
+       mv -f "$tempfile" "$VCSH_BASE/.gitignore.d/$VCSH_REPO_NAME" ||
+               fatal "could not move '$tempfile' to '$VCSH_BASE/.gitignore.d/$VCSH_REPO_NAME'" 53
+}
+
+if [ ! "x$VCSH_GITIGNORE" = 'xexact' ] && [ ! "x$VCSH_GITIGNORE" = 'xrecursive' ]; then
+       fatal "'\$VCSH_GITIGNORE' must be either 'exact' or 'recursive'" 1
+fi
 
 
+if [ "$1" = 'clone' ]; then
+       [ -z "$2" ] && fatal "$1: please specify a remote" 1
+       export VCSH_COMMAND="$1"
+       GIT_REMOTE="$2"
+       [ -n "$3" ] && VCSH_REPO_NAME="$3" || VCSH_REPO_NAME=$(basename "$GIT_REMOTE" .git)
+       export VCSH_REPO_NAME
+       export GIT_DIR="$VCSH_REPO_D/$VCSH_REPO_NAME.git"
+elif [ "$1" = 'version' ]; then
+       echo "$SELF $VERSION"
+       exit
+elif [ "$1" = 'which' ]; then
+       [ -z "$2" ] && fatal "$1: please specify a filename" 1
+       [ -n "$3" ] && fatal "$1: too many parameters" 1
+       export VCSH_COMMAND="$1"
+       export VCSH_COMMAND_PARAMETER="$2"
+elif [ "$1" = 'delete' ]           ||
+     [ "$1" = 'enter' ]            ||
+     [ "$1" = 'init' ]             ||
+     [ "$1" = 'list-tracked-by' ]  ||
+     [ "$1" = 'rename' ]           ||
+     [ "$1" = 'run' ]              ||
+     [ "$1" = 'upgrade' ]          ||
+     [ "$1" = 'write-gitignore' ]; 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_REPO_D/$VCSH_REPO_NAME.git"
+       [ "$VCSH_COMMAND" = 'rename' ] && export GIT_DIR_NEW="$VCSH_REPO_D/$3.git"
+       [ "$VCSH_COMMAND" = 'run' ]    && shift 2
+       [ "$VCSH_COMMAND" = 'write-gitignore' ]
+elif [ "$1" = 'list' ] ||
+     [ "$1" = 'list-tracked' ] ||
+     [ "$1" = 'pull' ] ||
+     [ "$1" = 'push' ]; then
+       export VCSH_COMMAND="$1"
+elif [ -n "$2" ]; then
+       export VCSH_COMMAND='run'
+       export VCSH_REPO_NAME="$1"
+       export GIT_DIR="$VCSH_REPO_D/$VCSH_REPO_NAME.git"
+       [ -d $GIT_DIR ] || { help; exit 1; }
+       shift 1
+       set -- "git" "$@"
+elif [ -n "$1" ]; then
+       export VCSH_COMMAND='enter'
+       export VCSH_REPO_NAME="$1"
+       export GIT_DIR="$VCSH_REPO_D/$VCSH_REPO_NAME.git"
+       [ -d $GIT_DIR ] || { help; exit 1; }
 else
 else
-       verbose "defaulting to calling help()"
-       help
-       echo "$SELF: fatal: You should never reach this code. File a bug, please."
-       return 99
+       # $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 $VCSH_REPO_NAME | grep -q '/'; then
+       export GIT_DIR=$VCSH_REPO_NAME
+       export VCSH_REPO_NAME=$(basename "$VCSH_REPO_NAME" .git)
 fi
 fi
+
+
+for check_directory in "$VCSH_REPO_D" "$VCSH_BASE/.gitignore.d"
+do
+       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'"
+                       mkdir -p "$check_directory" || fatal "could not create '$check_directory'" 50
+               fi
+       fi
+done
+
+verbose "$VCSH_COMMAND begin"
+export VCSH_COMMAND=$(echo $VCSH_COMMAND | sed 's/-/_/g')
+hook pre-command
+$VCSH_COMMAND "$@"
+hook post-command
+verbose "$VCSH_COMMAND end, exiting"