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diff --git a/autoload/filetype/ledger.kak b/autoload/filetype/ledger.kak
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+# Detection
+# ---------
+
+# The .ledger suffix is not required by ledger, but the best I can do.
+hook global BufCreate .*\.ledger %{
+    set-option buffer filetype ledger
+}
+
+# Initialization
+# --------------
+
+hook global WinSetOption filetype=ledger %{
+    require-module ledger
+
+    hook window InsertChar \n -group ledger-indent ledger-indent-on-new-line
+    hook window ModeChange pop:insert:.* -group ledger-trim-indent ledger-trim-indent
+
+    hook -once -always window WinSetOption filetype=.* %{
+        remove-hooks window ledger-.+
+        unset-option window static_words  # Remove static completion
+    }
+}
+
+hook -group ledger-highlight global WinSetOption filetype=ledger %{
+    add-highlighter window/ledger ref ledger
+    hook -once -always window WinSetOption filetype=.* %{
+        remove-highlighter window/ledger
+    }
+}
+
+# Completion
+# ----------
+
+hook -group ledger-complete global WinSetOption filetype=ledger %{
+    set-option window static_words account note alias payee check assert eval \
+        default apply fixed bucket capture comment commodity format nomarket \
+        define end include tag test year
+}
+
+provide-module ledger %[
+
+# Highlighters
+# ------------
+#
+# TODO: highlight tag comments
+
+add-highlighter shared/ledger regions
+
+# The following highlighters implement
+# https://www.ledger-cli.org/3.0/doc/ledger3.html#Transactions-and-Comments
+
+add-highlighter shared/ledger/transaction region '^[0-9]' '^(?=\H)' group
+add-highlighter shared/ledger/transaction/first_line regex \
+    '^([0-9].*?)\h.*?((  +|\t+);.*?)?$' 1:function 2:string
+add-highlighter shared/ledger/transaction/posting regex \
+    '^\h+([^\h;].*?)((  +|\t+).*?)?((  +|\t+);.*?)?$' 1:type 2:value 4:string
+add-highlighter shared/ledger/transaction/note regex '^\h+;[^$]*?$' 0:string
+
+add-highlighter shared/ledger/comment region '^(;|#|%|\||\*)' '$' fill comment
+
+# TODO: Improve
+add-highlighter shared/ledger/other region '^(P|=|~)' '$' fill meta
+
+# The following highlighters implement
+# https://www.ledger-cli.org/3.0/doc/ledger3.html#Command-Directives
+
+add-highlighter shared/ledger/default default-region group
+
+# Add highlighters for simple one-line command directives
+evaluate-commands %sh{
+    # TODO: Is `expr` also a command directive? The documentation confuses me.
+    for cmd in 'apply account' 'apply fixed' 'assert' 'bucket' 'check' 'end' \
+               'include' 'apply tag' 'test' 'year'; do
+        echo "add-highlighter shared/ledger/default/ regex '^${cmd}\b' 0:function"
+    done
+}
+
+add-highlighter shared/ledger/account region '^account' '^(?=\H)' group
+add-highlighter shared/ledger/account/first_line regex '^account'    0:function
+add-highlighter shared/ledger/account/note       regex '^\h*note'    0:function
+add-highlighter shared/ledger/account/alias      regex '^\h*alias'   0:function
+add-highlighter shared/ledger/account/payee      regex '^\h*payee'   0:function
+add-highlighter shared/ledger/account/check      regex '^\h*check'   0:function
+add-highlighter shared/ledger/account/assert     regex '^\h*assert'  0:function
+add-highlighter shared/ledger/account/eval       regex '^\h*eval'    0:function
+add-highlighter shared/ledger/account/default    regex '^\h*default' 0:function
+
+add-highlighter shared/ledger/alias region '^alias' '$' group
+add-highlighter shared/ledger/alias/keyword regex '^alias' 0:function
+add-highlighter shared/ledger/alias/key regex '^alias\h([^$=]*)=?' 1:variable
+add-highlighter shared/ledger/alias/value regex '^alias\h.*?=(.*?)$' 1:value
+
+add-highlighter shared/ledger/capture region '^capture' '$' group
+add-highlighter shared/ledger/capture/keyword regex '^capture' 0:function
+add-highlighter shared/ledger/capture/account regex \
+    '^capture\h+(.*?)(  +|\t+|$)' 1:type
+add-highlighter shared/ledger/capture/regex regex \
+    '^capture\h+.*?(  +|\t+)(.*?)$' 2:value
+
+add-highlighter shared/ledger/comment_block region '^comment' '^end comment' \
+    fill comment
+
+add-highlighter shared/ledger/commodity region '^commodity' '^(?=\H)' group
+add-highlighter shared/ledger/commodity/first_line regex '^commodity'   0:function
+add-highlighter shared/ledger/commodity/note       regex '^\h*note'     0:function
+add-highlighter shared/ledger/commodity/format     regex '^\h*format'   0:function
+add-highlighter shared/ledger/commodity/nomarket   regex '^\h*nomarket' 0:function
+add-highlighter shared/ledger/commodity/alias      regex '^\h*alias'    0:function
+add-highlighter shared/ledger/commodity/default    regex '^\h*default'  0:function
+
+add-highlighter shared/ledger/define region '^define' '$' group
+add-highlighter shared/ledger/define/keyword regex '^define' 0:function
+add-highlighter shared/ledger/define/key regex '^define\h([^$=]*)=?' 1:variable
+add-highlighter shared/ledger/define/value regex '^define\h.*?=(.*?)$' 1:value
+
+add-highlighter shared/ledger/payee region '^payee' '^(?=\H)' group
+add-highlighter shared/ledger/payee/first_line regex '^payee'    0:function
+add-highlighter shared/ledger/payee/alias      regex '^\h*alias' 0:function
+add-highlighter shared/ledger/payee/uuid       regex '^\h*uuid'  0:function
+
+add-highlighter shared/ledger/tag region '^tag' '^(?=\H)' group
+add-highlighter shared/ledger/tag/first_line regex '^tag'       0:function
+add-highlighter shared/ledger/tag/check      regex '^\h*check'  0:function
+add-highlighter shared/ledger/tag/assert     regex '^\h*assert' 0:function
+
+# Commands
+# --------
+
+define-command -hidden ledger-indent-on-new-line %[
+    evaluate-commands -draft -itersel %[
+        # preserve previous line indent
+        try %[ execute-keys -draft <semicolon> K <a-&> ]
+        # cleanup trailing whitespaces from previous line
+        try %[ execute-keys -draft k x s \h+$ <ret> d ]
+        # indent after the first line of a transaction
+        try %[ execute-keys -draft kx <a-k>^[0-9]<ret> j<a-gt> ]
+    ]
+]
+
+define-command -hidden ledger-trim-indent %{
+    try %{ execute-keys -draft <semicolon> x s ^\h+$ <ret> d }
+}
+
+]