Refactor alt handling

* Simplify score_file() by using case in instead of nested ifs with regexps.
* Merge record_score() and record_template().
* Alt condition processing no longer stops when a template condition is seen
  but continues processing to verify that all conditions are valid (as the
  documentation says it should). Fixes #478.
* Support alt dirs with deeply nested tracked files (fixes #490).
* Use git ls-files to filter out which tracked files to consider for alt
  processing. Should speed up auto-alt (#505).
* Use nocasematch when comparing distro and distro_family. Fixed #455.

test/test_alt.py

@@ -170,6 +170,21 @@ def test_alt_templates(runner, paths, kind, label):
             assert str(paths.work.join(source_file)) in created
 
 
+@pytest.mark.usefixtures("ds1_copy")
+def test_alt_template_with_condition(runner, paths, tst_arch):
+    """Test template with extra condition"""
+    yadm_dir, yadm_data = setup_standard_yadm_dir(paths)
+
+    suffix = f"##template,arch.not{tst_arch}"
+    utils.create_alt_files(paths, suffix)
+    run = runner([paths.pgm, "-Y", yadm_dir, "--yadm-data", yadm_data, "alt"])
+    assert run.success
+    assert run.err == ""
+
+    created = utils.parse_alt_output(run.out, linked=False)
+    assert len(created) == 0
+
+
 @pytest.mark.usefixtures("ds1_copy")
 @pytest.mark.parametrize("autoalt", [None, "true", "false"])
 def test_auto_alt(runner, yadm_cmd, paths, autoalt):

test/test_alt_copy.py

@@ -40,7 +40,8 @@ def test_alt_copy(runner, yadm_cmd, paths, tst_sys, setting, expect_link, pre_ex
     run = runner(yadm_cmd("alt"))
     assert run.success
     assert run.err == ""
-    assert "Linking" in run.out
+    action = "Copying" if setting is True else "Linking"
+    assert action in run.out
 
     assert alt_path.read() == expected_content
     assert alt_path.islink() == expect_link

test/test_unit_record_score.py

@@ -19,6 +19,7 @@ REPORT_RESULTS = """
     echo "SCORES:${alt_scores[@]}"
     echo "TARGETS:${alt_targets[@]}"
     echo "SOURCES:${alt_sources[@]}"
+    echo "TEMPLATE_CMDS:${alt_template_cmds[@]}"
 """
 
 
@@ -38,6 +39,7 @@ def test_dont_record_zeros(runner, yadm):
     assert "SCORES:\n" in run.out
     assert "TARGETS:\n" in run.out
     assert "SOURCES:\n" in run.out
+    assert "TEMPLATE_CMDS:\n" in run.out
 
 
 def test_new_scores(runner, yadm):
@@ -46,9 +48,9 @@ def test_new_scores(runner, yadm):
     script = f"""
         YADM_TEST=1 source {yadm}
         {INIT_VARS}
-        record_score "1" "tgt_one"   "src_one"
+        record_score "1" "tgt_one"   "src_one"   ""
-        record_score "2" "tgt_two"   "src_two"
+        record_score "2" "tgt_two"   "src_two"   ""
-        record_score "4" "tgt_three" "src_three"
+        record_score "4" "tgt_three" "src_three" ""
         {REPORT_RESULTS}
     """
     run = runner(command=["bash"], inp=script)
@@ -58,6 +60,7 @@ def test_new_scores(runner, yadm):
     assert "SCORES:1 2 4\n" in run.out
     assert "TARGETS:tgt_one tgt_two tgt_three\n" in run.out
     assert "SOURCES:src_one src_two src_three\n" in run.out
+    assert "TEMPLATE_CMDS:  \n" in run.out
 
 
 @pytest.mark.parametrize("difference", ["lower", "equal", "higher"])
@@ -81,7 +84,8 @@ def test_existing_scores(runner, yadm, difference):
         alt_scores=(2)
         alt_targets=("testtgt")
         alt_sources=("existing_src")
-        record_score "{score}" "testtgt" "new_src"
+        alt_template_cmds=("")
+        record_score "{score}" "testtgt" "new_src" ""
         {REPORT_RESULTS}
     """
     run = runner(command=["bash"], inp=script)
@@ -91,6 +95,7 @@ def test_existing_scores(runner, yadm, difference):
     assert f"SCORES:{expected_score}\n" in run.out
     assert "TARGETS:testtgt\n" in run.out
     assert f"SOURCES:{expected_src}\n" in run.out
+    assert "TEMPLATE_CMDS:\n" in run.out
 
 
 def test_existing_template(runner, yadm):
@@ -101,9 +106,9 @@ def test_existing_template(runner, yadm):
         {INIT_VARS}
         alt_scores=(1)
         alt_targets=("testtgt")
-        alt_sources=()
+        alt_sources=("src")
         alt_template_cmds=("existing_template")
-        record_score "2" "testtgt" "new_src"
+        record_score "2" "testtgt" "new_src" ""
         {REPORT_RESULTS}
     """
     run = runner(command=["bash"], inp=script)
@@ -112,7 +117,8 @@ def test_existing_template(runner, yadm):
     assert "SIZE:1\n" in run.out
     assert "SCORES:1\n" in run.out
     assert "TARGETS:testtgt\n" in run.out
-    assert "SOURCES:\n" in run.out
+    assert "SOURCES:src\n" in run.out
+    assert "TEMPLATE_CMDS:existing_template\n" in run.out
 
 
 def test_config_first(runner, yadm):
@@ -123,20 +129,61 @@ def test_config_first(runner, yadm):
         YADM_TEST=1 source {yadm}
         {INIT_VARS}
         YADM_CONFIG={config}
-        record_score "1" "tgt_before" "src_before"
+        record_score "1" "tgt_before" "src_before" ""
-        record_template "tgt_tmp" "cmd_tmp" "src_tmp"
+        record_score "1" "tgt_tmp"    "src_tmp"    "cmd_tmp"
-        record_score "2" "{config}"   "src_config"
+        record_score "2" "{config}"   "src_config" ""
-        record_score "3" "tgt_after"  "src_after"
+        record_score "3" "tgt_after"  "src_after"  ""
+        {REPORT_RESULTS}
+    """
+    run = runner(command=["bash"], inp=script)
+    assert run.success
+    assert run.err == ""
+    assert "SIZE:4\n" in run.out
+    assert "SCORES:2 1 1 3\n" in run.out
+    assert f"TARGETS:{config} tgt_before tgt_tmp tgt_after\n" in run.out
+    assert "SOURCES:src_config src_before src_tmp src_after\n" in run.out
+    assert "TEMPLATE_CMDS:  cmd_tmp \n" in run.out
+
+
+def test_new_template(runner, yadm):
+    """Test new template"""
+
+    script = f"""
+        YADM_TEST=1 source {yadm}
+        {INIT_VARS}
+        record_score 0 "tgt_one"   "src_one"   "cmd_one"
+        record_score 0 "tgt_two"   "src_two"   "cmd_two"
+        record_score 0 "tgt_three" "src_three" "cmd_three"
         {REPORT_RESULTS}
-        echo "CMD_VALUE:${{alt_template_cmds[@]}}"
-        echo "CMD_INDEX:${{!alt_template_cmds[@]}}"
     """
     run = runner(command=["bash"], inp=script)
     assert run.success
     assert run.err == ""
     assert "SIZE:3\n" in run.out
-    assert "SCORES:2 1 3\n" in run.out
+    assert "SCORES:0 0 0\n" in run.out
-    assert f"TARGETS:{config} tgt_before tgt_tmp tgt_after\n" in run.out
+    assert "TARGETS:tgt_one tgt_two tgt_three\n" in run.out
-    assert "SOURCES:src_config src_before src_tmp src_after\n" in run.out
+    assert "SOURCES:src_one src_two src_three\n" in run.out
-    assert "CMD_VALUE:cmd_tmp\n" in run.out
+    assert "TEMPLATE_CMDS:cmd_one cmd_two cmd_three\n" in run.out
-    assert "CMD_INDEX:2\n" in run.out
+
+
+def test_overwrite_existing_template(runner, yadm):
+    """Overwrite existing templates"""
+
+    script = f"""
+        YADM_TEST=1 source {yadm}
+        {INIT_VARS}
+        alt_scores=(0)
+        alt_targets=("testtgt")
+        alt_template_cmds=("existing_cmd")
+        alt_sources=("existing_src")
+        record_score 0 "testtgt" "new_src" "new_cmd"
+        {REPORT_RESULTS}
+    """
+    run = runner(command=["bash"], inp=script)
+    assert run.success
+    assert run.err == ""
+    assert "SIZE:1\n" in run.out
+    assert "SCORES:0\n" in run.out
+    assert "TARGETS:testtgt\n" in run.out
+    assert "SOURCES:new_src\n" in run.out
+    assert "TEMPLATE_CMDS:new_cmd\n" in run.out

test/test_unit_record_template.py

@@ -1,55 +0,0 @@
-"""Unit tests: record_template"""
-
-INIT_VARS = """
-    alt_targets=()
-    alt_template_cmds=()
-    alt_sources=()
-"""
-
-REPORT_RESULTS = """
-    echo "SIZE:${#alt_targets[@]}"
-    echo "TARGETS:${alt_targets[@]}"
-    echo "CMDS:${alt_template_cmds[@]}"
-    echo "SOURCES:${alt_sources[@]}"
-"""
-
-
-def test_new_template(runner, yadm):
-    """Test new template"""
-
-    script = f"""
-        YADM_TEST=1 source {yadm}
-        {INIT_VARS}
-        record_template "tgt_one"   "cmd_one"   "src_one"
-        record_template "tgt_two"   "cmd_two"   "src_two"
-        record_template "tgt_three" "cmd_three" "src_three"
-        {REPORT_RESULTS}
-    """
-    run = runner(command=["bash"], inp=script)
-    assert run.success
-    assert run.err == ""
-    assert "SIZE:3\n" in run.out
-    assert "TARGETS:tgt_one tgt_two tgt_three\n" in run.out
-    assert "CMDS:cmd_one cmd_two cmd_three\n" in run.out
-    assert "SOURCES:src_one src_two src_three\n" in run.out
-
-
-def test_existing_template(runner, yadm):
-    """Overwrite existing templates"""
-
-    script = f"""
-        YADM_TEST=1 source {yadm}
-        {INIT_VARS}
-        alt_targets=("testtgt")
-        alt_template_cmds=("existing_cmd")
-        alt_sources=("existing_src")
-        record_template "testtgt" "new_cmd" "new_src"
-        {REPORT_RESULTS}
-    """
-    run = runner(command=["bash"], inp=script)
-    assert run.success
-    assert run.err == ""
-    assert "SIZE:1\n" in run.out
-    assert "TARGETS:testtgt\n" in run.out
-    assert "CMDS:new_cmd\n" in run.out
-    assert "SOURCES:new_src\n" in run.out

test/test_unit_remove_stale_links.py

@@ -25,7 +25,7 @@ def test_remove_stale_links(runner, yadm, tmpdir, kind, linked):
 
     script = f"""
         YADM_TEST=1 source {yadm}
-        possible_alts=({link})
+        possible_alt_targets=({link})
         alt_linked=({alt_linked})
         function rm() {{ echo rm "$@"; }}
         remove_stale_links

test/test_unit_score_file.py

@@ -89,7 +89,7 @@ def calculate_score(filename):
             else:
                 score = 0
                 break
-        elif label in TEMPLATE_LABELS:
+        elif label not in TEMPLATE_LABELS:
             score = 0
             break
     return score
@@ -190,7 +190,7 @@ def test_score_values(runner, yadm, default, arch, system, distro, cla, host, us
     expected = ""
     for filename, score in filenames.items():
         script += f"""
-            score_file "{filename}"
+            score_file "{filename}" "dest"
             echo "{filename}"
             echo "$score"
         """
@@ -255,7 +255,7 @@ def test_score_values_templates(runner, yadm):
     expected = ""
     for filename, score in filenames.items():
         script += f"""
-            score_file "{filename}"
+            score_file "{filename}" "dest"
             echo "{filename}"
             echo "$score"
         """
@@ -279,7 +279,7 @@ def test_template_recording(runner, yadm, cmd_generated):
 
     script = f"""
         YADM_TEST=1 source {yadm}
-        function record_template() {{ echo "template recorded"; }}
+        function record_score() {{ [ -n "$4" ] && echo "template recorded"; }}
         {mock}
         score_file "testfile##template.kind"
     """
@@ -289,15 +289,15 @@ def test_template_recording(runner, yadm, cmd_generated):
     assert run.out.rstrip() == expected
 
 
-def test_underscores_in_distro_and_family(runner, yadm):
+def test_underscores_and_upper_case_in_distro_and_family(runner, yadm):
-    """Test replacing spaces in distro / distro_family with underscores"""
+    """Test replacing spaces with underscores and lowering case in distro / distro_family"""
     local_distro = "test distro"
     local_distro_family = "test family"
     filenames = {
-        "filename##distro.test distro": 1004,
+        "filename##distro.Test Distro": 1004,
         "filename##distro.test-distro": 0,
         "filename##distro.test_distro": 1004,
-        "filename##distro_family.test family": 1008,
+        "filename##distro_family.test FAMILY": 1008,
         "filename##distro_family.test-family": 0,
         "filename##distro_family.test_family": 1008,
     }

test/utils.py

@@ -12,7 +12,7 @@ ALT_DIR = "test alt/test alt dir"
 
 # Directory based alternates must have a tracked contained file.
 # This will be the test contained file name
-CONTAINED = "contained_file"
+CONTAINED = "contained_dir/contained_file"
 
 # These variables are used for making include files which will be processed
 # within jinja templates
@@ -84,7 +84,7 @@ def parse_alt_output(output, linked=True):
     """Parse output of 'alt', and return list of linked files"""
     regex = r"Creating (.+) from template (.+)$"
     if linked:
-        regex = r"Linking (.+) to (.+)$"
+        regex = r"(?:Copy|Link)ing (.+) to (.+)$"
     parsed_list = {}
     for line in output.splitlines():
         match = re.match(regex, line)

yadm

@@ -166,188 +166,139 @@ function main() {
 # ****** Alternate Processing ******
 
 function score_file() {
-  src="$1"
+  local source="$1"
-  tgt="${src%%##*}"
+  local target="$2"
-  conditions="${src#*##}"
+  local conditions="${source#*##}"
-
-  if [ "${tgt#"$YADM_ALT/"}" != "${tgt}" ]; then
-    tgt="${YADM_BASE}/${tgt#"$YADM_ALT/"}"
-  fi
 
   score=0
+  local template_cmd=""
+
   IFS=',' read -ra fields <<< "$conditions"
   for field in "${fields[@]}"; do
-    label=${field%%.*}
+    local label=${field%%.*}
-    value=${field#*.}
+    local value=${field#*.}
     [ "$field" = "$label" ] && value="" # when .value is omitted
-    # extension isn't a condition and doesn't affect the score
+
-    if [[ "$label" =~ ^(e|extension)$ ]]; then
+    local -i delta=-1
-      continue
+    case "$label" in
-    fi
+      default)
-    score=$((score + 1000))
+        delta=0
-    # default condition
+        ;;
-    if [[ "$label" =~ ^(default)$ ]]; then
+      a|arch)
-      score=$((score + 0))
+        [ "$value" = "$local_arch" ] && delta=1
-    # variable conditions
+        ;;
-    elif [[ "$label" =~ ^(a|arch)$ ]]; then
+      o|os)
-      if [ "$value" = "$local_arch" ]; then
+        [ "$value" = "$local_system" ] && delta=2
-        score=$((score + 1))
+        ;;
-      else
+      d|distro)
-        score=0
+        shopt -s nocasematch
-        return
+        [[ "${value// /_}" = "${local_distro// /_}" ]] && delta=4
-      fi
+        shopt -u nocasematch
-    elif [[ "$label" =~ ^(o|os)$ ]]; then
+        ;;
-      if [ "$value" = "$local_system" ]; then
+      f|distro_family)
-        score=$((score + 2))
+        shopt -s nocasematch
-      else
+        [[ "${value// /_}" = "${local_distro_family// /_}" ]] && delta=8
-        score=0
+        shopt -u nocasematch
-        return
+        ;;
-      fi
+      c|class)
-    elif [[ "$label" =~ ^(d|distro)$ ]]; then
+        in_list "$value" "${local_classes[@]}" && delta=16
-      if [ "${value/\ /_}" = "${local_distro/\ /_}" ]; then
+        ;;
-        score=$((score + 4))
+      h|hostname)
-      else
+        [ "$value" = "$local_host" ] && delta=32
-        score=0
+        ;;
-        return
+      u|user)
-      fi
+        [ "$value" = "$local_user" ] && delta=64
-    elif [[ "$label" =~ ^(f|distro_family)$ ]]; then
+        ;;
-      if [ "${value/\ /_}" = "${local_distro_family/\ /_}" ]; then
+      e|extension)
-        score=$((score + 8))
+        # extension isn't a condition and doesn't affect the score
-      else
+        continue
-        score=0
+        ;;
-        return
+      t|template|yadm)
-      fi
+        if [ -d "$source" ]; then
-    elif [[ "$label" =~ ^(c|class)$ ]]; then
+          INVALID_ALT+=("$source")
-      if in_list "$value" "${local_classes[@]}"; then
+        else
-        score=$((score + 16))
+          template_cmd=$(choose_template_cmd "$value")
-      else
+          if [ -n "$template_cmd" ]; then
-        score=0
+            delta=0
-        return
+          else
-      fi
+            debug "No supported template processor for template $source"
-    elif [[ "$label" =~ ^(h|hostname)$ ]]; then
+            [ -n "$loud" ] && echo "No supported template processor for template $source"
-      if [ "$value" = "$local_host" ]; then
+          fi
-        score=$((score + 32))
+        fi
-      else
+        ;;
-        score=0
+      *)
-        return
+        INVALID_ALT+=("$source")
-      fi
+        ;;
-    elif [[ "$label" =~ ^(u|user)$ ]]; then
+    esac
-      if [ "$value" = "$local_user" ]; then
+
-        score=$((score + 64))
+    if (( delta < 0 )); then
-      else
-        score=0
-        return
-      fi
-    # templates
-    elif [[ "$label" =~ ^(t|template|yadm)$ ]]; then
-      score=0
-      cmd=$(choose_template_cmd "$value")
-      if [ -n "$cmd" ]; then
-        record_template "$tgt" "$cmd" "$src"
-      else
-        debug "No supported template processor for template $src"
-        [ -n "$loud" ] && echo "No supported template processor for template $src"
-      fi
-      return 0
-    # unsupported values
-    else
-      if [[ "${src##*/}" =~ .\#\#. ]]; then
-        INVALID_ALT+=("$src")
-      fi
       score=0
       return
     fi
+    score=$(( score + 1000 + delta ))
   done
 
-  record_score "$score" "$tgt" "$src"
+  record_score "$score" "$target" "$source" "$template_cmd"
 }
 
 function record_score() {
-  score="$1"
+  local score="$1"
-  tgt="$2"
+  local target="$2"
-  src="$3"
+  local source="$3"
+  local template_cmd="$4"
 
   # record nothing if the score is zero
-  [ "$score" -eq 0 ] && return
+  [ "$score" -eq 0 ] && [ -z "$template_cmd" ] && return
 
   # search for the index of this target, to see if we already are tracking it
-  index=-1
+  local -i index=$((${#alt_targets[@]} - 1))
-  for search_index in "${!alt_targets[@]}"; do
+  for (( ; index >= 0; --index )); do
-    if [ "${alt_targets[$search_index]}" = "$tgt" ]; then
+    if [ "${alt_targets[$index]}" = "$target" ]; then
-        index="$search_index"
+      break
-        break
     fi
   done
-  # if we don't find an existing index, create one by appending to the array
+
-  if [ "$index" -eq -1 ]; then
+  if [ $index -lt 0 ]; then
     # $YADM_CONFIG must be processed first, in case other templates lookup yadm configurations
-    if [ "$tgt" = "$YADM_CONFIG" ]; then
+    if [ "$target" = "$YADM_CONFIG" ]; then
-        alt_targets=("$tgt" "${alt_targets[@]}")
+        alt_targets=("$target" "${alt_targets[@]}")
-        alt_sources=("$src" "${alt_sources[@]}")
+
-        alt_scores=(0 "${alt_scores[@]}")
+        alt_sources=("$source" "${alt_sources[@]}")
-        index=0
+        alt_scores=("$score" "${alt_scores[@]}")
-        # increase the index of any existing alt_template_cmds
+        alt_template_cmds=("$template_cmd" "${alt_template_cmds[@]}")
-        new_cmds=()
-        for cmd_index in "${!alt_template_cmds[@]}"; do
-            new_cmds[cmd_index+1]="${alt_template_cmds[$cmd_index]}"
-        done
-        alt_template_cmds=()
-        for cmd_index in "${!new_cmds[@]}"; do
-            alt_template_cmds[cmd_index]="${new_cmds[$cmd_index]}"
-        done
     else
-        alt_targets+=("$tgt")
+      alt_targets+=("$target")
-        # set index to the last index (newly created one)
-        for index in "${!alt_targets[@]}"; do :; done
-        # and set its initial score to zero
-        alt_scores[index]=0
-     fi
-  fi
 
-  # record nothing if a template command is registered for this file
+      alt_sources+=("$source")
-  [ "${alt_template_cmds[$index]+isset}" ] && return
+      alt_scores+=("$score")
-
+      alt_template_cmds+=("$template_cmd")
-  # record higher scoring sources
-  if [ "$score" -gt "${alt_scores[$index]}" ]; then
-    alt_scores[index]="$score"
-    alt_sources[index]="$src"
-  fi
-
-}
-
-function record_template() {
-  tgt="$1"
-  cmd="$2"
-  src="$3"
-
-  # search for the index of this target, to see if we already are tracking it
-  index=-1
-  for search_index in "${!alt_targets[@]}"; do
-    if [ "${alt_targets[$search_index]}" = "$tgt" ]; then
-        index="$search_index"
-        break
     fi
-  done
+    return
-  # if we don't find an existing index, create one by appending to the array
-  if [ "$index" -eq -1 ]; then
-    alt_targets+=("$tgt")
-    # set index to the last index (newly created one)
-    for index in "${!alt_targets[@]}"; do :; done
   fi
 
-  # record the template command, last one wins
+  if [[ -n "${alt_template_cmds[$index]}" ]]; then
-  alt_template_cmds[index]="$cmd"
+    if [[ -z "$template_cmd" || "$score" -lt "${alt_scores[$index]}" ]]; then
-  alt_sources[index]="$src"
+      # No template command, or template command but lower score
+      return
+    fi
+  elif [[ -z "$template_cmd" && "$score" -le "${alt_scores[$index]}" ]]; then
+    # No template command and too low score
+    return
+  fi
 
+  # Record new alt
+  alt_sources[index]="$source"
+  alt_scores[index]="$score"
+  alt_template_cmds[index]="$template_cmd"
 }
 
 function choose_template_cmd() {
-  kind="$1"
+  local kind="$1"
 
-  if [ "$kind" = "default" ] || [ "$kind" = "" ] && awk_available; then
+  if [ "$kind" = "default" ] || [ "$kind" = "" ]; then
-    echo "template_default"
+    awk_available && echo "template_default"
-  elif [ "$kind" = "esh" ] && esh_available; then
+  elif [ "$kind" = "esh" ]; then
-    echo "template_esh"
+    esh_available && echo "template_esh"
   elif [ "$kind" = "j2cli" ] || [ "$kind" = "j2" ] && j2cli_available; then
     echo "template_j2cli"
   elif [ "$kind" = "envtpl" ] || [ "$kind" = "j2" ] && envtpl_available; then
@@ -488,7 +439,7 @@ EOF
     -v distro="$local_distro" \
     -v distro_family="$local_distro_family" \
     -v source="$input" \
-    -v source_dir="$(dirname "$input")" \
+    -v source_dir="$(builtin_dirname "$input")" \
     "$awk_pgm" \
     "$input" "${local_classes[@]}" > "$temp_file" || rm -f "$temp_file"
 
@@ -599,29 +550,45 @@ function alt() {
   # determine all tracked files
   local tracked_files=()
   local IFS=$'\n'
-  for tracked_file in $("$GIT_PROGRAM" ls-files | LC_ALL=C sort); do
+  for tracked_file in $("$GIT_PROGRAM" ls-files -- '*##*'); do
     tracked_files+=("$tracked_file")
   done
 
-  # generate data for removing stale links
+  local alt_targets=()
-  local possible_alts=()
+  local alt_sources=()
-  local IFS=$'\n'
+  local alt_scores=()
-  for possible_alt in "${tracked_files[@]}" "${ENCRYPT_INCLUDE_FILES[@]}"; do
+  local alt_template_cmds=()
-    if [[ $possible_alt =~ .\#\#. ]]; then
+
-      base_alt="${possible_alt%%##*}"
+  # For removing stale links
-      yadm_alt="${YADM_BASE}/${base_alt}"
+  local possible_alt_targets=()
-      if [ "${yadm_alt#"$YADM_ALT/"}" != "${yadm_alt}" ]; then
+
-        base_alt="${yadm_alt#"$YADM_ALT/"}"
+  local alt_source
-      fi
+  for alt_source in "${tracked_files[@]}" "${ENCRYPT_INCLUDE_FILES[@]}"; do
-      possible_alts+=("$YADM_BASE/${base_alt}")
+    local conditions="${alt_source#*##}"
+    if [ "$alt_source" = "$conditions" ]; then
+      continue
     fi
+
+    local target_base="${alt_source%%##*}"
+    alt_source="${YADM_BASE}/${target_base}##${conditions%%/*}"
+    local alt_target="${YADM_BASE}/${target_base}"
+    if [ "${alt_target#"$YADM_ALT/"}" != "$alt_target" ]; then
+      target_base="${alt_target#"$YADM_ALT/"}"
+    fi
+    alt_target="${YADM_BASE}/${target_base}"
+
+    if ! in_list "$alt_target" "${possible_alt_targets[@]}"; then
+      possible_alt_targets+=("$alt_target")
+    fi
+
+    score_file "$alt_source" "$alt_target"
   done
+
   local alt_linked=()
 
   alt_linking
   remove_stale_links
   report_invalid_alts
-
 }
 
 function report_invalid_alts() {
@@ -662,7 +629,7 @@ function remove_stale_links() {
   # if a possible alt IS linked, but it's source is not part of alt_linked,
   # remove it.
   if readlink_available; then
-    for stale_candidate in "${possible_alts[@]}"; do
+    for stale_candidate in "${possible_alt_targets[@]}"; do
       if [ -L "$stale_candidate" ]; then
         src=$(readlink "$stale_candidate" 2>/dev/null)
         if [ -n "$src" ]; then
@@ -681,8 +648,8 @@ function set_local_alt_values() {
   local -a all_classes
   all_classes=$(config --get-all local.class)
   while IFS='' read -r class; do
-      local_classes+=("$class")
+    local_classes+=("$class")
-      local_class="$class"
+    local_class="$class"
   done <<< "$all_classes"
 
   local_arch="$(config local.arch)"
@@ -712,50 +679,33 @@ function set_local_alt_values() {
 }
 
 function alt_linking() {
+  local -i index
+  for (( index = 0; index < ${#alt_targets[@]}; ++index )); do
+    local target="${alt_targets[$index]}"
+    local source="${alt_sources[$index]}"
+    local template_cmd="${alt_template_cmds[$index]}"
 
-  local alt_scores=()
+    assert_parent "$target"
-  local alt_targets=()
-  local alt_sources=()
-  local alt_template_cmds=()
 
-  for alt_path in $(for tracked in "${tracked_files[@]}"; do printf "%s\n" "$tracked" "${tracked%/*}"; done | LC_ALL=C sort -u) "${ENCRYPT_INCLUDE_FILES[@]}"; do
+    if [[ -n "$template_cmd" ]]; then
-    alt_path="$YADM_BASE/$alt_path"
+      debug "Creating $target from template $source"
-    if [[ "$alt_path" =~ .\#\#. ]]; then
+      [[ -n "$loud" ]] && echo "Creating $target from template $source"
-      if [ -e "$alt_path" ] ; then
+
-        score_file "$alt_path"
+      [[ -L "$target" ]] && rm -f "$target"
-      fi
+      "$template_cmd" "$source" "$target"
+    elif [[ "$do_copy" -eq 1 ]]; then
+      debug "Copying $source to $target"
+      [[ -n "$loud" ]] && echo "Copying $source to $target"
+
+      [[ -L "$target" ]] && rm -f "$target"
+      cp -f "$source" "$target"
+    else
+      debug "Linking $source to $target"
+      [[ -n "$loud" ]] && echo "Linking $source to $target"
+
+      ln_relative "$source" "$target"
     fi
   done
-
-  for index in "${!alt_targets[@]}"; do
-    tgt="${alt_targets[$index]}"
-    src="${alt_sources[$index]}"
-    template_cmd="${alt_template_cmds[$index]}"
-    if [ -n "$template_cmd" ]; then
-      # a template is defined, process the template
-      debug "Creating $tgt from template $src"
-      [ -n "$loud" ] && echo "Creating $tgt from template $src"
-      # ensure the destination path exists
-      assert_parent "$tgt"
-      # remove any existing symlink before processing template
-      [ -L "$tgt" ] && rm -f "$tgt"
-      "$template_cmd" "$src" "$tgt"
-    elif [ -n "$src" ]; then
-      # a link source is defined, create symlink
-      debug "Linking $src to $tgt"
-      [ -n "$loud" ] && echo "Linking $src to $tgt"
-      # ensure the destination path exists
-      assert_parent "$tgt"
-      if [ "$do_copy" -eq 1 ]; then
-        # remove any existing symlink before copying
-        [ -L "$tgt" ] && rm -f "$tgt"
-        cp -f "$src" "$tgt"
-      else
-        ln_relative "$src" "$tgt"
-      fi
-    fi
-  done
-
 }
 
 function ln_relative() {

yadm.1

@@ -595,7 +595,7 @@ If no "##default" version exists and no files have valid conditions, then no
 link will be created.
 
 Links are also created for directories named this way, as long as they have at
-least one yadm managed file within them (at the top level).
+least one yadm managed file within them.
 
 yadm will automatically create these links by default. This can be disabled
 using the