4 files changed, 52 insertions, 14 deletions
diff --git a/Biz/Ide/ftags.sh b/Biz/Ide/ftags.sh
index daa4ca0..2687e9a 100755
--- a/Biz/Ide/ftags.sh
+++ b/Biz/Ide/ftags.sh
@@ -2,17 +2,12 @@
 # ftags - search ctags
 set -euo pipefail
 tags=$BIZ_ROOT/tags
-if [[ ! -e $tags ]]
-then
-  fast-tags -R $BIZ_ROOT
-else
-  line=$(
-    awk 'BEGIN { FS="\t" } !/^!/ {print toupper($4)"\t"$1"\t"$2"\t"$3}' $tags \
-      | cut -c1-80 \
-      | fzf --nth=1,2
-  )
-  ${EDITOR:-vim} \
-    $(cut -f3 <<< "$line") \
-    -c "set nocst" \
-    -c "silent tag $(cut -f2 <<< "$line")"
-fi
+tag_search=$(
+  awk 'BEGIN { FS="\t" } !/^!/ {print toupper($4)"\t"$1"\t"$2"\t"$3}' $tags \
+    | cut -c1-80 \
+    | fzf --nth=1,2
+)
+${EDITOR:-vim} \
+  $(cut -f3 <<< "$tag_search") \
+  -c "set nocst" \
+  -c "silent tag $(cut -f2 <<< "$tag_search")"
diff --git a/Biz/Ide/init_tags.sh b/Biz/Ide/init_tags.sh
new file mode 100755
index 0000000..10e9c85
--- /dev/null
+++ b/Biz/Ide/init_tags.sh
@@ -0,0 +1,13 @@
+#!/usr/bin/env bash
+# fast-tags wrapper to generate tags automatically if there are none.
+
+flags=(
+    --fully-qualified
+)
+fns=$@
+if [[ ! -r tags ]]; then
+    echo Generating tags from scratch...
+    exec fast-tags $flags -R .
+else
+    exec fast-tags $flags $fns
+fi
diff --git a/Biz/Ide/post-checkout b/Biz/Ide/post-checkout
new file mode 100755
index 0000000..5474b5a
--- /dev/null
+++ b/Biz/Ide/post-checkout
@@ -0,0 +1,28 @@
+#!/usr/bin/env bash
+set -eu
+
+# Path to wherever you put this.
+init_tags=$BIZ_ROOT/Biz/Ide/init_tags.sh
+
+old=$1
+new=$2
+# is_branch=$2 # 1 if branch, 2 if file
+
+# filter out only the changed files
+changed=($(git diff --name-only $old $new))
+
+if [[ ! -r tags ]]
+then
+    $init_tags
+elif [[ ${#changed} -gt 0 ]]
+then
+    grep -v -F --regexp=${^changed} $BIZ_ROOT/tags > $BIZ_ROOT/tags.tmp
+    mv tags.tmp tags
+
+    # Retag all hs files except the ones that were deleted.
+    modified=($(git diff --name-only --diff-filter=d $old $new))
+    # Filter *.hs, since grep returns non-zero for no matches.
+    modified=(${(M)modified:#*.hs})
+    echo "modified: $modified"
+    $init_tags $modified
+fi
diff --git a/Biz/Ide/post-merge b/Biz/Ide/post-merge
new file mode 100755
index 0000000..624e797
--- /dev/null
+++ b/Biz/Ide/post-merge
@@ -0,0 +1,2 @@
+#!/usr/bin/env bash
+exec $BIZ_ROOT/Biz/Ide/post-checkout 'HEAD@{1}' HEAD