diff --git a/rc/gas.kak b/rc/gas.kak
new file mode 100644
index 00000000..e9da5f9f
--- /dev/null
+++ b/rc/gas.kak
@@ -0,0 +1,80 @@
+# Detection
+# ---------
+hook global BufCreate .*\.(s|S|asm)$ %{
+    set buffer filetype gas
+}
+
+
+addhl -group / regions -default code gas \
+    string         '"' (?<!\\)(\\\\)*"        '' \
+    commentMulti   /\*       \*/              '' \
+    commentSingle1 '#'       '$'              '' \
+    commentSingle2 ';'       '$'              ''
+
+addhl -group /gas/string fill string
+addhl -group /gas/commentMulti fill comment
+addhl -group /gas/commentSingle1 fill comment
+addhl -group /gas/commentSingle2 fill comment
+
+# Constant
+addhl -group /gas/code regex (0[xX][0-9]+|\b[0-9]+)\b 0:value
+# Label
+addhl -group /gas/code regex ^\h*([A-Za-z0-9_-]+)\h*: 0:operator
+# ARM Directives
+addhl -group /gas/code regex (\s+\.([248]byte|align|arch(_extension)?|arm|bsscantunwind|code|[cf]pu|[dq]n|eabi_attribute|even|extend|ldouble|fnend|fnstart|force_thumb|handlerdata|inst(\.[nw])?|ltorg|movsp|object_arch|packed|pad|personality(index)?|pool|req|save|setfp|screl32|syntax|thumb(_func|_set)?|tlsdescseq|unreq|unwind_raw|vsave)\b) 0:type
+# Assembler Directives
+addhl -group /gas/code regex (\s+\.(abort|ABORT|align|app-file|ascii|asciz|balign[wl]|byte|comm|data|def|desc|dim|double|eject|else|endif|equ|extern|file|fill|float|global|globl|hword|ident|if|include|int|irp|irpc|lcomm|iflags|line|linkonce|ln|mri|list|long|macro|nolist|octa|org|print|purgem|p2align[wl]|psize|quad|rept|sbttl|section|set|short|single|size|skip|space|stab[dns]|string|struct|tag|text|title|type|title|uleb128|val|vtable_entry|word|rodata)\b) 0:type
+# Registers
+addhl -group /gas/code regex \%(([re](ax|bx|cx|dx|si|di|bp|sp))|(al|bl|cl|dl|sil|dil|bpl|spl)|(r[8-9][dwb])|(r1[0-5][dwb])|(cs|ds|es|fs|gs|ss|ip|eflags)|([xy]mm[0-9]|[xy]mm1[0-5]))\b 0:identifier
+# Instructions
+addhl -group /gas/code regex \h*(mov|lea|call|test|cmp)([bwlq])?\b|\
+\h*(bswap[lq]|cbtw|cmpxchg[bwlq]|cmpxchg8b|cwt[ld]|movabs[bwlq]|popa(l|w)?|pusha([wl])?)\b|\
+\h*(and|or|not|xor|sar|sal|shr|shl|sub|add|(i)?mul|(i)?div|inc|dec|adc|sbb)([bwlq])?\b|\
+\h*(rcl|rcr|rol|ror|shld|shrd)([bwlq])?\b|\
+\h*(bsf|bsr|bt|btc|btr|bts)([wlq])?\b|\
+\h*(cmps|lods|movs)([qblw])?\b|\
+\h*((i)?ret|leave|movzb[wlq]|movzw[lq]|movsb[wlq]|movsw[lq]|movslq|clt[ql]|cqt[od])\b|\
+\h*set(([bagl])?e|(n)?[zlesgabop]|(n)?(ae|le|ge|be))\b|\
+\h*(cmovn[eszlgba]|cmov[glab]e|cmov[esglabz]|cmovn[lgba]e)\b|\
+\h*(jmp|j[esglabzcop]|jn[esglabzcop]|j[glasbp]e|jn[glab]e|j(e)?cxz|jpo)\b|\
+\h*(aa[adms]|da[as]|xadd[bwlq]|xchg[lwq])\b|\
+\h*(rep|repnz|repz|scas([qlwb])?|stos([qlwb])?)\b|\
+\h*(cl[cdi]|cmc|lahf|popf([lwq])?|pushf([lwq])?|sahf|st[cdi])\b|\
+\h*(l[defgs]s([wl])?|cpuid|nop|ud2|xlat(b)?)\b|\
+\h*(lea|call|push)([wlq])?\b|\
+\h*(in|ins([lwb])?|out|outs([lwb])?)\b|\
+\h*(bound([wl])?|enter|int(o)?|lcall|loop(n)?[ez]|lret)\b|\
+\h*(vmovs[ds]|vmovap[sd])\b|\
+\h*(vcvtts[ds]2si(q)?|vcvtsi2s[d](q)?|vunpcklps|vcvtps2pd|vmovddup|vcvtpd2psx)\b|\
+\h*(vxorp[sd]|vandp[sd]|ucomis[sd])\b 0:keyword
+
+def -hidden _gas_filter_around_selections %{
+    eval -draft -itersel %{
+        exec <a-x>
+        # remove trailing white spaces
+        try %{ exec -draft s \h+$ <ret> d }
+    }
+}
+
+def -hidden _gas_indent_on_new_line %~
+    eval -draft -itersel %<
+        # preserve previous line indent
+        try %{ exec -draft <space> K <a-&> }
+        # filter previous line
+        try %{ exec -draft k : _gas_filter_around_selections <ret> }
+        # indent after label
+        try %[ exec -draft k <a-x> <a-k> :$ <ret> j <a-gt> ]
+    >
+~
+
+hook global WinSetOption filetype=gas %{
+    addhl ref gas
+
+    hook window InsertChar \n -group gas-indent _gas_indent_on_new_line
+}
+
+hook global WinSetOption filetype=(?!gas).* %{
+    rmhl gas
+
+    rmhooks window gas-indent
+}