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#!/bin/sh

# Copyright (c) 2007, 2008 Rocco Rutte <[e-mail]> and others.
# License: MIT <http://www.opensource.org/licenses/mit-license.php>

ROOT="$(dirname "$(which "$0")")"
REPO=""
PFX="hg2git"
SFX_MAPPING="mapping"
SFX_MARKS="marks"
SFX_HEADS="heads"
SFX_STATE="state"
GFI_OPTS=""
PYTHON=${PYTHON:-python}

USAGE="[--quiet] [-r <repo>] [--force] [-m <max>] [-s] [--hgtags] [-A <file>] [-B <file>] [-T <file>] [-M <name>] [-o <name>] [--hg-hash] [-e <encoding>]"
LONG_USAGE="Import hg repository <repo> up to either tip or <max>
If <repo> is omitted, use last hg repository as obtained from state file,
GIT_DIR/$PFX-$SFX_STATE by default.

Note: The argument order matters.

Options:
	--quiet   Passed to git-fast-import(1)
	-r <repo> Mercurial repository to import
	--force   Ignore validation errors when converting, and pass --force
	          to git-fast-import(1)
	-m <max>  Maximum revision to import
	-s        Enable parsing Signed-off-by lines
	--hgtags  Enable exporting .hgtags files
	-A <file> Read author map from file
	          (Same as in git-svnimport(1) and git-cvsimport(1))
	-B <file> Read branch map from file
	-T <file> Read tags map from file
	-M <name> Set the default branch name (defaults to 'master')
	-o <name> Use <name> as branch namespace to track upstream (eg 'origin')
	--hg-hash Annotate commits with the hg hash as git notes in the
                  hg namespace.
	-e <encoding> Assume commit and author strings retrieved from 
	              Mercurial are encoded in <encoding>
	--fe <filename_encoding> Assume filenames from Mercurial are encoded 
	                         in <filename_encoding>
"
case "$1" in
    -h|--help)
      echo "usage: $(basename "$0") $USAGE"
      echo ""
      echo "$LONG_USAGE"
      exit 0
esac

IS_BARE=$(git rev-parse --is-bare-repository) \
    || (echo "Could not find git repo" ; exit 1)
if test "z$IS_BARE" != ztrue; then
   # This is not a bare repo, cd to the toplevel
   TOPLEVEL=$(git rev-parse --show-toplevel) \
       || (echo "Could not find git repo toplevel" ; exit 1)
   cd $TOPLEVEL || exit 1
fi
GIT_DIR=$(git rev-parse --git-dir) || (echo "Could not find git repo" ; exit 1)

while case "$#" in 0) break ;; esac
do
  case "$1" in
    -r|--r|--re|--rep|--repo)
      shift
      REPO="$1"
      ;;
    --q|--qu|--qui|--quie|--quiet)
      GFI_OPTS="$GFI_OPTS --quiet"
      ;;
    --force)
      # pass --force to git-fast-import and hg-fast-export.py
      GFI_OPTS="$GFI_OPTS --force"
      break
      ;;
    -*)
      # pass any other options down to hg2git.py
      break
      ;;
    *)
      break
      ;;
  esac
  shift
done

# for convenience: get default repo from state file
if [ x"$REPO" = x -a -f "$GIT_DIR/$PFX-$SFX_STATE" ] ; then
  REPO="`grep '^:repo ' "$GIT_DIR/$PFX-$SFX_STATE" | cut -d ' ' -f 2`"
  echo "Using last hg repository \"$REPO\""
fi

if [  -z "$REPO" ]; then
    echo "no repo given, use -r flag"
    exit 1
fi

# make sure we have a marks cache
if [ ! -f "$GIT_DIR/$PFX-$SFX_MARKS" ] ; then
  touch "$GIT_DIR/$PFX-$SFX_MARKS"
fi

# cleanup on exit
trap 'rm -f "$GIT_DIR/$PFX-$SFX_MARKS.old" "$GIT_DIR/$PFX-$SFX_MARKS.tmp"' 0

_err1=
_err2=
exec 3>&1
{ read -r _err1 || :; read -r _err2 || :; } <<-EOT
$(
  exec 4>&3 3>&1 1>&4 4>&-
  {
    _e1=0
    GIT_DIR="$GIT_DIR" $PYTHON "$ROOT/hg-fast-export.py" \
      --repo "$REPO" \
      --marks "$GIT_DIR/$PFX-$SFX_MARKS" \
      --mapping "$GIT_DIR/$PFX-$SFX_MAPPING" \
      --heads "$GIT_DIR/$PFX-$SFX_HEADS" \
      --status "$GIT_DIR/$PFX-$SFX_STATE" \
      "$@" 3>&- || _e1=$?
    echo $_e1 >&3
  } | \
  {
    _e2=0
    git fast-import $GFI_OPTS --export-marks="$GIT_DIR/$PFX-$SFX_MARKS.tmp" 3>&- || _e2=$?
    echo $_e2 >&3
  }
)
EOT
exec 3>&-
[ "$_err1" = 0 -a "$_err2" = 0 ] || exit 1

# move recent marks cache out of the way...
if [ -f "$GIT_DIR/$PFX-$SFX_MARKS" ] ; then
  mv "$GIT_DIR/$PFX-$SFX_MARKS" "$GIT_DIR/$PFX-$SFX_MARKS.old"
else
  touch "$GIT_DIR/$PFX-$SFX_MARKS.old"
fi

# ...to create a new merged one
cat "$GIT_DIR/$PFX-$SFX_MARKS.old" "$GIT_DIR/$PFX-$SFX_MARKS.tmp" \
| uniq > "$GIT_DIR/$PFX-$SFX_MARKS"

# save SHA1s of current heads for incremental imports
# and connectivity (plus sanity checking)
for head in `git branch | sed 's#^..##'` ; do
  id="`git rev-parse refs/heads/$head`"
  echo ":$head $id"
done > "$GIT_DIR/$PFX-$SFX_HEADS"

# check diff with color:
# ( for i in `find . -type f | grep -v '\.git'` ; do diff -u $i $REPO/$i ; done | cdiff ) | less -r