diff --git a/Cargo.lock b/Cargo.lock
index 4b9ebb2..996df83 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -7,8 +7,10 @@ name = "aoc-vv"
 version = "0.1.0"
 dependencies = [
  "itertools",
+ "nom",
  "num-derive",
  "num-traits",
+ "path-clean",
 ]
 
 [[package]]
@@ -32,6 +34,28 @@ dependencies = [
  "either",
 ]
 
+[[package]]
+name = "memchr"
+version = "2.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2dffe52ecf27772e601905b7522cb4ef790d2cc203488bbd0e2fe85fcb74566d"
+
+[[package]]
+name = "minimal-lexical"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "68354c5c6bd36d73ff3feceb05efa59b6acb7626617f4962be322a825e61f79a"
+
+[[package]]
+name = "nom"
+version = "7.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a8903e5a29a317527874d0402f867152a3d21c908bb0b933e416c65e301d4c36"
+dependencies = [
+ "memchr",
+ "minimal-lexical",
+]
+
 [[package]]
 name = "num-derive"
 version = "0.2.5"
@@ -52,6 +76,12 @@ dependencies = [
  "autocfg",
 ]
 
+[[package]]
+name = "path-clean"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ecba01bf2678719532c5e3059e0b5f0811273d94b397088b82e3bd0a78c78fdd"
+
 [[package]]
 name = "proc-macro2"
 version = "0.4.30"
diff --git a/Cargo.toml b/Cargo.toml
index 06f6a9f..a732655 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -2,7 +2,7 @@
 name = "aoc-vv"
 version = "0.1.0"
 edition = "2021"
-default-run = "p06"
+default-run = "p07"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
@@ -10,3 +10,5 @@ default-run = "p06"
 num-traits = "0.2"
 num-derive = "0.2"
 itertools = "0.10.5"
+nom = "7.1.1"
+path-clean = "0.1.0"
diff --git a/etc/p07.txt b/etc/p07.txt
new file mode 100644
index 0000000..ba513ae
--- /dev/null
+++ b/etc/p07.txt
@@ -0,0 +1,983 @@
+$ cd /
+$ ls
+dir gqcclj
+dir lmtpm
+dir nhqwt
+dir qcq
+dir vwqwlqrt
+$ cd gqcclj
+$ ls
+62425 dqp.gjm
+174181 hrtw.qsd
+273712 pflp.mdw
+169404 zlthnlhf.mtn
+180878 zprprf
+$ cd ..
+$ cd lmtpm
+$ ls
+dir clffsvcw
+163587 cvcl.jqh
+dir dcqnblb
+dir dtpwln
+dir fvt
+dir hrcrw
+dir jdqzmqn
+236754 nrdmlj
+205959 pflp.mdw
+dir qcq
+dir rsn
+129926 vdgcqdn.sqd
+dir zprprf
+$ cd clffsvcw
+$ ls
+6997 dcqnblb.wbh
+145711 dqp
+159225 pflp.mdw
+$ cd ..
+$ cd dcqnblb
+$ ls
+dir dcqnblb
+dir gfn
+dir lpswsp
+dir lvt
+dir zprprf
+$ cd dcqnblb
+$ ls
+2020 grpdmd.ggz
+dir zpswzfvg
+$ cd zpswzfvg
+$ ls
+206998 zprprf.gnw
+$ cd ..
+$ cd ..
+$ cd gfn
+$ ls
+277530 rhbvtblc.mvw
+$ cd ..
+$ cd lpswsp
+$ ls
+173180 dcqnblb
+$ cd ..
+$ cd lvt
+$ ls
+dir hjllwsvl
+dir ptbt
+$ cd hjllwsvl
+$ ls
+dir wqnc
+$ cd wqnc
+$ ls
+64695 grpdmd.ggz
+$ cd ..
+$ cd ..
+$ cd ptbt
+$ ls
+150880 vvbt.gtp
+$ cd ..
+$ cd ..
+$ cd zprprf
+$ ls
+dir ldzslndn
+dir qftt
+$ cd ldzslndn
+$ ls
+dir bwqqsbhg
+129454 vbn
+$ cd bwqqsbhg
+$ ls
+108701 zprprf.gss
+$ cd ..
+$ cd ..
+$ cd qftt
+$ ls
+64268 cvcl.jqh
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd dtpwln
+$ ls
+196215 cvcl.jqh
+dir dpwg
+dir ldzslndn
+dir znnsqqh
+$ cd dpwg
+$ ls
+192388 gmh
+47754 grgzh.qdl
+99449 hqsh
+dir pbmf
+50061 pflp.mdw
+192902 qcq.pgg
+dir rmpvj
+dir scgc
+$ cd pbmf
+$ ls
+210083 wpfnwbl.mgf
+$ cd ..
+$ cd rmpvj
+$ ls
+125738 nmlnbvrd
+226214 zprprf.jnp
+114257 zprprf.srs
+$ cd ..
+$ cd scgc
+$ ls
+182115 rrc.rcc
+$ cd ..
+$ cd ..
+$ cd ldzslndn
+$ ls
+201992 qcrm.cpd
+$ cd ..
+$ cd znnsqqh
+$ ls
+85635 cvcl.jqh
+$ cd ..
+$ cd ..
+$ cd fvt
+$ ls
+dir dcqnblb
+dir gnc
+75864 vfn
+$ cd dcqnblb
+$ ls
+dir dcqnblb
+dir lbnflwsh
+$ cd dcqnblb
+$ ls
+269901 cvcl.jqh
+$ cd ..
+$ cd lbnflwsh
+$ ls
+33336 grpdmd.ggz
+42861 phg.wmc
+$ cd ..
+$ cd ..
+$ cd gnc
+$ ls
+dir jhjbjsp
+dir jjppr
+$ cd jhjbjsp
+$ ls
+96177 ldzslndn
+$ cd ..
+$ cd jjppr
+$ ls
+181016 dqp
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd hrcrw
+$ ls
+261376 dtjfpppr.dww
+54658 vsrgvw.pfn
+$ cd ..
+$ cd jdqzmqn
+$ ls
+52342 dcpndc.vlg
+171946 gggpchh.tbb
+dir ldzslndn
+11156 nbfrfvv.gzw
+$ cd ldzslndn
+$ ls
+107873 cvcl.jqh
+216034 gfdjrbz
+68844 pqllfrrh.jcf
+$ cd ..
+$ cd ..
+$ cd qcq
+$ ls
+152886 ldzslndn.ltn
+105125 vwplh.vbf
+$ cd ..
+$ cd rsn
+$ ls
+15385 hqcmjdgv.jjv
+105735 qcq.bzg
+58805 snczcsp
+26668 vbn
+$ cd ..
+$ cd zprprf
+$ ls
+dir chbmq
+dir dcqnblb
+dir dqp
+dir nfspb
+89506 zprprf.hnt
+$ cd chbmq
+$ ls
+dir cnjvw
+dir dqp
+151434 frsvrdnt
+dir msztjvcb
+240689 qcq.jlh
+dir sjzrcg
+97312 vnr.zfr
+dir zprprf
+$ cd cnjvw
+$ ls
+dir bpbs
+252403 cqhtshc
+dir djmjhn
+10935 fhqmswr
+6582 pdwml.ldd
+dir qcq
+219282 rfmd
+$ cd bpbs
+$ ls
+147582 bnhwsnsj.gdm
+61362 cvcl.jqh
+152857 vdgcqdn.sqd
+$ cd ..
+$ cd djmjhn
+$ ls
+dir bjdbcjbb
+dir dcqnblb
+dir dqp
+dir lgdwtt
+$ cd bjdbcjbb
+$ ls
+110710 cvcl.jqh
+252792 hmshctr.lgz
+dir mjhtmbj
+189745 shsswcgr
+dir tfnhp
+194940 vbn
+dir zprprf
+$ cd mjhtmbj
+$ ls
+dir dqp
+dir hbthpcmb
+$ cd dqp
+$ ls
+200832 sbcrz.qgw
+$ cd ..
+$ cd hbthpcmb
+$ ls
+55191 ffcntg
+$ cd ..
+$ cd ..
+$ cd tfnhp
+$ ls
+276825 dqp
+161538 gqmr.wgb
+$ cd ..
+$ cd zprprf
+$ ls
+287638 dcqnblb.ssp
+41274 hgmrvj.mwf
+249118 sbb.gsf
+105141 wwrg.gqz
+$ cd ..
+$ cd ..
+$ cd dcqnblb
+$ ls
+1957 btmmc
+32386 dtzbzg.dhm
+dir mmrbj
+98283 ntmhfgtl.pmf
+dir zprprf
+$ cd mmrbj
+$ ls
+273194 wnsq
+251527 zprprf
+$ cd ..
+$ cd zprprf
+$ ls
+27678 ldzslndn.rrl
+62866 ljf.fdj
+148502 qcq.dlg
+dir rvgqvm
+179231 tllnmhn.pjp
+64033 vbn
+dir zcdrj
+$ cd rvgqvm
+$ ls
+dir ntbv
+262324 prhgj.szz
+dir qbvdh
+$ cd ntbv
+$ ls
+116608 cgv.fvj
+175200 swpswq.twt
+$ cd ..
+$ cd qbvdh
+$ ls
+160353 sdhfrb.wjn
+$ cd ..
+$ cd ..
+$ cd zcdrj
+$ ls
+283262 ctl
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd dqp
+$ ls
+dir jfzm
+111438 rdrgb.mjf
+64194 wgtmqrq
+dir zprprf
+$ cd jfzm
+$ ls
+158774 pflp.mdw
+$ cd ..
+$ cd zprprf
+$ ls
+215264 sgsstcp
+$ cd ..
+$ cd ..
+$ cd lgdwtt
+$ ls
+dir qcq
+$ cd qcq
+$ ls
+165461 ldzslndn.vvb
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd qcq
+$ ls
+dir dpd
+165044 grpdmd.ggz
+82343 ldzslndn
+dir mwg
+176689 psjcwp.wct
+44404 qcq.zwd
+$ cd dpd
+$ ls
+84087 dqp
+227386 zprprf.gfs
+$ cd ..
+$ cd mwg
+$ ls
+214086 pflp.mdw
+dir sjjsdn
+225859 wcdt
+158892 zprprf.frs
+$ cd sjjsdn
+$ ls
+260121 gplgp.dfn
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd dqp
+$ ls
+dir hcrwclpg
+dir zphd
+$ cd hcrwclpg
+$ ls
+dir cmqntjj
+16393 ldzslndn.qbm
+91152 qqdtc.zdq
+$ cd cmqntjj
+$ ls
+272266 ldzslndn.pll
+$ cd ..
+$ cd ..
+$ cd zphd
+$ ls
+165711 chftwcsw.fqw
+256871 cvcl.jqh
+251168 zprprf.gfv
+$ cd ..
+$ cd ..
+$ cd msztjvcb
+$ ls
+206231 brzn.lmn
+dir dcqnblb
+21571 dqp
+dir fmn
+45779 mlfctz.cjr
+288827 pflp.mdw
+220578 qcq.fqf
+$ cd dcqnblb
+$ ls
+198121 ghbwgs
+93681 nmqhl.vpq
+$ cd ..
+$ cd fmn
+$ ls
+29407 mdfws.qvs
+$ cd ..
+$ cd ..
+$ cd sjzrcg
+$ ls
+155120 ddclvsjr.rpq
+136029 ldzslndn.dcm
+dir vhzh
+$ cd vhzh
+$ ls
+212446 vbn
+$ cd ..
+$ cd ..
+$ cd zprprf
+$ ls
+240335 crt.gqh
+185363 gnmm.qgh
+dir ldzslndn
+dir nwl
+dir qll
+277043 vbn
+217796 vtvgpdl.vtm
+$ cd ldzslndn
+$ ls
+273570 cvcl.jqh
+68510 fgdmz.hrc
+dir npq
+dir swjrzzrm
+$ cd npq
+$ ls
+97923 dzcjsqwt
+$ cd ..
+$ cd swjrzzrm
+$ ls
+180599 tmpgn.bjf
+$ cd ..
+$ cd ..
+$ cd nwl
+$ ls
+171833 dlwrfhh.qgn
+$ cd ..
+$ cd qll
+$ ls
+219926 dcqnblb.bvn
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd dcqnblb
+$ ls
+dir lvpb
+276198 tbgcm.qct
+$ cd lvpb
+$ ls
+142590 bvhjlld
+268259 gnjfg.sgb
+dir qcq
+206220 qcq.zsg
+258137 rrsw.dnb
+dir tmr
+215549 vbn
+$ cd qcq
+$ ls
+dir mmpgd
+dir tdsz
+dir tmfvsjwc
+$ cd mmpgd
+$ ls
+70793 jwbnpwnn
+$ cd ..
+$ cd tdsz
+$ ls
+246310 tdvrhhg.bzq
+$ cd ..
+$ cd tmfvsjwc
+$ ls
+103899 grpdmd.ggz
+287850 ldzslndn
+125930 llhr
+$ cd ..
+$ cd ..
+$ cd tmr
+$ ls
+83344 fbtfcg.hqp
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd dqp
+$ ls
+dir lbgmcbv
+dir nbg
+$ cd lbgmcbv
+$ ls
+81776 wzdzzdp
+$ cd ..
+$ cd nbg
+$ ls
+dir mfsgjp
+155574 pflp.mdw
+$ cd mfsgjp
+$ ls
+199400 vdgcqdn.sqd
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd nfspb
+$ ls
+262412 csrdtbs
+73867 vbn
+136389 zqps.hjt
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd nhqwt
+$ ls
+123766 cvcl.jqh
+dir dhrtvctp
+222086 grpdmd.ggz
+dir gzg
+26005 lhpmz.tgz
+dir mcnjwwfr
+117122 msn.gst
+$ cd dhrtvctp
+$ ls
+224079 vdgcqdn.sqd
+$ cd ..
+$ cd gzg
+$ ls
+124395 dqp
+dir wqdbtqm
+$ cd wqdbtqm
+$ ls
+237354 pflp.mdw
+212019 vdgcqdn.sqd
+$ cd ..
+$ cd ..
+$ cd mcnjwwfr
+$ ls
+92504 cshdztf
+dir dctl
+dir dqp
+dir flcrmhlj
+161879 grpdmd.ggz
+dir gtt
+dir hlbnhchz
+220093 mdtdsgvm.zgg
+dir twntr
+287192 vbn
+$ cd dctl
+$ ls
+dir bbhch
+155396 hrrj.jzm
+164971 pblqmwj.vdb
+dir wnlgfpvf
+$ cd bbhch
+$ ls
+dir dpqtp
+dir jvdrcw
+$ cd dpqtp
+$ ls
+174135 gwb.qrb
+$ cd ..
+$ cd jvdrcw
+$ ls
+215993 dcqnblb.cqp
+200800 stjttf.ngc
+$ cd ..
+$ cd ..
+$ cd wnlgfpvf
+$ ls
+135978 cvcl.jqh
+dir dqp
+54018 lbrfmt
+$ cd dqp
+$ ls
+270516 dcqnblb.jqw
+dir dqp
+144626 grpdmd.ggz
+157731 hvcv.rhp
+133773 lnnt
+76250 vdgcqdn.sqd
+$ cd dqp
+$ ls
+41504 zprprf.cmc
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd dqp
+$ ls
+dir dqp
+dir ldzslndn
+236737 mqzcvm.fjh
+239746 nhcdz.ncj
+dir rpchqq
+248824 vdgcqdn.sqd
+250937 zrchht.mwg
+$ cd dqp
+$ ls
+203381 qcq.djm
+$ cd ..
+$ cd ldzslndn
+$ ls
+dir dqp
+dir fptnzlv
+dir gmbnpm
+dir vhvblt
+$ cd dqp
+$ ls
+19579 qcq.lhg
+$ cd ..
+$ cd fptnzlv
+$ ls
+209930 dcqnblb
+$ cd ..
+$ cd gmbnpm
+$ ls
+dir ldzslndn
+dir qcq
+$ cd ldzslndn
+$ ls
+11075 pflp.mdw
+$ cd ..
+$ cd qcq
+$ ls
+dir tdp
+$ cd tdp
+$ ls
+40741 vdgcqdn.sqd
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd vhvblt
+$ ls
+dir lzr
+$ cd lzr
+$ ls
+62245 gbnj.llg
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd rpchqq
+$ ls
+dir bcs
+dir dcqnblb
+dir fvjzn
+dir lrphzrv
+$ cd bcs
+$ ls
+179794 bbn.dzb
+242069 cmjdmzjf.zgf
+1703 cvcl.jqh
+dir gnmhwj
+dir ldzslndn
+152520 qltpsz.jsj
+dir sqqjfps
+$ cd gnmhwj
+$ ls
+dir gvs
+201600 hptn.ftf
+dir hzrnb
+dir qcq
+dir sqhl
+$ cd gvs
+$ ls
+152358 zprprf.mlh
+$ cd ..
+$ cd hzrnb
+$ ls
+94290 gplsfd
+$ cd ..
+$ cd qcq
+$ ls
+91909 vmqd.bmg
+$ cd ..
+$ cd sqhl
+$ ls
+238673 vdgcqdn.sqd
+262885 zmdvr.nfg
+$ cd ..
+$ cd ..
+$ cd ldzslndn
+$ ls
+240461 mdz
+84303 qtj
+$ cd ..
+$ cd sqqjfps
+$ ls
+88753 fwn.tff
+$ cd ..
+$ cd ..
+$ cd dcqnblb
+$ ls
+dir dqp
+189996 dqp.pvp
+$ cd dqp
+$ ls
+dir qvfjz
+196506 vbn
+$ cd qvfjz
+$ ls
+209316 pflp.mdw
+107459 rwpbh.vpt
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd fvjzn
+$ ls
+241464 cvcl.jqh
+dir dqp
+dir ldzslndn
+dir msp
+125 pflp.mdw
+131895 vbn
+$ cd dqp
+$ ls
+34019 pflp.mdw
+202957 vbn
+$ cd ..
+$ cd ldzslndn
+$ ls
+147492 cvcl.jqh
+248719 spc.rfv
+$ cd ..
+$ cd msp
+$ ls
+184407 cvcl.jqh
+$ cd ..
+$ cd ..
+$ cd lrphzrv
+$ ls
+dir bbwqmbg
+81858 cvcl.jqh
+dir dqp
+248670 gqqsww.tsn
+199141 grpdmd.ggz
+dir ldzslndn
+34514 ldzslndn.ctw
+dir tln
+214615 zprprf.fwm
+$ cd bbwqmbg
+$ ls
+129750 flf
+dir pvlw
+dir qcq
+126 sqcqphz.tbm
+$ cd pvlw
+$ ls
+198005 jfvj.hdv
+$ cd ..
+$ cd qcq
+$ ls
+dir wgdzws
+$ cd wgdzws
+$ ls
+253522 ldzslndn.qwt
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd dqp
+$ ls
+281993 cvcl.jqh
+dir hwqjlwcb
+50532 msccz.qgm
+102187 trv.tnq
+111 wplnmj.bfl
+$ cd hwqjlwcb
+$ ls
+267580 dhjqb.dsb
+153195 ldzslndn.jqv
+41526 mvwcwc.zsc
+$ cd ..
+$ cd ..
+$ cd ldzslndn
+$ ls
+58666 cvcl.jqh
+79950 dqp.tmc
+242217 hns.lrb
+dir njswzh
+240692 vdgcqdn.sqd
+dir zvmjvcdm
+52909 zzh
+$ cd njswzh
+$ ls
+149732 cvcl.jqh
+dir rnmfd
+$ cd rnmfd
+$ ls
+75368 dqp.hmv
+14350 vbn
+$ cd ..
+$ cd ..
+$ cd zvmjvcdm
+$ ls
+dir jgczt
+$ cd jgczt
+$ ls
+dir qcq
+95941 qzvvwshv.jwc
+$ cd qcq
+$ ls
+273942 pflp.mdw
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd tln
+$ ls
+dir bmcng
+1518 lrg
+dir vnjfrhp
+$ cd bmcng
+$ ls
+38917 fqcrt
+$ cd ..
+$ cd vnjfrhp
+$ ls
+dir dcqnblb
+dir dqp
+247186 grpdmd.ggz
+dir ldzslndn
+169216 pflp.mdw
+206487 vdgcqdn.sqd
+16976 vlsrzjmb.mmc
+257938 wjl
+$ cd dcqnblb
+$ ls
+dir dqp
+$ cd dqp
+$ ls
+184133 qcq
+$ cd ..
+$ cd ..
+$ cd dqp
+$ ls
+dir dcqnblb
+31612 dqp.pnt
+212283 ldzslndn
+61600 vdbfc.ddj
+197189 wpv.wff
+$ cd dcqnblb
+$ ls
+62412 tfzllmrj
+dir zprprf
+$ cd zprprf
+$ ls
+dir bqnpsl
+dir dszrvpzc
+$ cd bqnpsl
+$ ls
+261548 spbsbbsw.cmn
+$ cd ..
+$ cd dszrvpzc
+$ ls
+188232 sggpqslr.smn
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd ldzslndn
+$ ls
+dir bgnhd
+dir pgvcdzwz
+dir qgzhm
+$ cd bgnhd
+$ ls
+56989 cvcl.jqh
+$ cd ..
+$ cd pgvcdzwz
+$ ls
+110034 qhgnndv
+$ cd ..
+$ cd qgzhm
+$ ls
+247232 grpdmd.ggz
+269292 ldzslndn
+153843 tpz
+dir vnschqwr
+162392 wnq.btb
+$ cd vnschqwr
+$ ls
+43005 fvtvzfqm.jvc
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd flcrmhlj
+$ ls
+245668 dcqnblb.sdj
+dir lffj
+229909 pflp.mdw
+280176 vbn
+$ cd lffj
+$ ls
+116451 jmzz.jdd
+dir pjlwb
+162815 pmhlqq.snr
+226183 zffth
+$ cd pjlwb
+$ ls
+67518 qcq.hjq
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd gtt
+$ ls
+52105 grpdmd.ggz
+126869 zprprf.fgj
+$ cd ..
+$ cd hlbnhchz
+$ ls
+3064 dqp.lrw
+278756 grpdmd.ggz
+177208 ldzslndn.wlv
+141685 vbn
+$ cd ..
+$ cd twntr
+$ ls
+63747 cvcl.jqh
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd qcq
+$ ls
+226858 cwblp.zgp
+dir jjqsmfhr
+dir rjbqtrq
+dir vwmpnbts
+141715 wdbhdch
+286381 zprprf
+$ cd jjqsmfhr
+$ ls
+dir btmm
+dir fqndtlgq
+$ cd btmm
+$ ls
+4031 dqp.lrr
+dir fzdd
+$ cd fzdd
+$ ls
+dir vnwpn
+$ cd vnwpn
+$ ls
+dir bzlgsl
+dir ztvzrrbv
+$ cd bzlgsl
+$ ls
+9294 ldzslndn.sqr
+$ cd ..
+$ cd ztvzrrbv
+$ ls
+256017 cvcl.jqh
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd fqndtlgq
+$ ls
+271528 ccbmgp.bwd
+$ cd ..
+$ cd ..
+$ cd rjbqtrq
+$ ls
+122150 ldzslndn
+46467 tpdvp.pjf
+$ cd ..
+$ cd vwmpnbts
+$ ls
+47518 fcrwfzvm
+263343 gmc.lrt
+212764 qcq
+$ cd ..
+$ cd ..
+$ cd vwqwlqrt
+$ ls
+dir psrs
+$ cd psrs
+$ ls
+281998 zprprf.hml
diff --git a/src/bin/p02.rs b/src/bin/p02.rs
index 19ce5c1..96a9561 100644
--- a/src/bin/p02.rs
+++ b/src/bin/p02.rs
@@ -63,6 +63,7 @@ impl FromStr for Outcome {
             "Z" => Ok(Self::Win),
             _ => Err("Unknown outcome!"),
         }
+
     }
 }
 
diff --git a/src/bin/p07.rs b/src/bin/p07.rs
new file mode 100644
index 0000000..52912c5
--- /dev/null
+++ b/src/bin/p07.rs
@@ -0,0 +1,187 @@
+#![feature(iterator_try_collect, absolute_path)]
+
+use std::collections::HashMap;
+use std::fs;
+use std::io::{self, BufRead, Read};
+use std::path::{PathBuf};
+
+mod parsing {
+    use nom::{
+        branch::alt,
+        bytes::complete::{is_not, tag},
+        character::complete::{digit1, multispace0},
+        combinator::{into, map, map_res},
+        sequence::{delimited, pair, preceded, separated_pair},
+        IResult,
+    };
+
+    #[derive(Debug, PartialEq)]
+    pub enum Command {
+        Ls,
+        Cd(String),
+    }
+
+    fn cd(input: &str) -> IResult<&str, Command> {
+        let (input, dir) =
+            preceded(delimited(multispace0, tag("cd"), multispace0), filename)(input)?;
+        Ok((input, Command::Cd(dir)))
+    }
+
+    fn ls(input: &str) -> IResult<&str, Command> {
+        let (input, _) = tag("ls")(input)?;
+        Ok((input, Command::Ls))
+    }
+
+    fn command(input: &str) -> IResult<&str, Command> {
+        preceded(delimited(multispace0, tag("$"), multispace0), alt((cd, ls)))(input)
+    }
+
+    #[derive(Debug, PartialEq)]
+    pub enum Listing {
+        Dir(String),
+        File(String, usize),
+    }
+
+    impl Listing {
+        pub fn path(&self) -> &String {
+            match self {
+                Self::Dir(s) => s,
+                Self::File(s, _) => s,
+            }
+        }
+    }
+
+    fn dir(input: &str) -> IResult<&str, Listing> {
+        let (input, f_name) = preceded(pair(tag("dir"), multispace0), filename)(input)?;
+        Ok((input, Listing::Dir(f_name)))
+    }
+
+    fn filename(input: &str) -> IResult<&str, String> {
+        map(is_not(" "), |r: &str| r.to_string())(input)
+    }
+
+    fn file(input: &str) -> IResult<&str, Listing> {
+        let (input, (f_size, f_name)) = separated_pair(
+            map_res(digit1, |s: &str| s.parse::<usize>()),
+            multispace0,
+            filename,
+        )(input)?;
+        Ok((input, Listing::File(f_name, f_size)))
+    }
+
+    fn listing(input: &str) -> IResult<&str, Listing> {
+        alt((dir, file))(input)
+    }
+
+    #[derive(Debug, PartialEq)]
+    pub enum Line {
+        Result(Listing),
+        Command(Command),
+    }
+
+    impl From<Listing> for Line {
+        fn from(value: Listing) -> Self {
+            Self::Result(value)
+        }
+    }
+
+    impl From<Command> for Line {
+        fn from(value: Command) -> Self {
+            Self::Command(value)
+        }
+    }
+
+    pub fn line(input: &str) -> IResult<&str, Line> {
+        alt((into(listing), into(command)))(input)
+    }
+
+    #[cfg(test)]
+    mod tests {
+        use super::*;
+
+        #[test]
+        fn test_command() {
+            assert_eq!(Ok(("", Command::Ls)), command("$ ls"));
+            assert_eq!(
+                Ok(("", Command::Cd("poo".to_string()))),
+                command("$ cd poo")
+            );
+        }
+
+        #[test]
+        fn test_listing() {
+            assert_eq!(
+                Ok(("", Listing::Dir("cabbage".to_string()))),
+                listing("dir cabbage")
+            );
+            assert_eq!(
+                Ok(("", Listing::File("boob.txt".to_string(), 424242))),
+                listing("424242 boob.txt")
+            );
+        }
+    }
+}
+
+fn main() {
+    let filename = "etc/p07.txt";
+    let file = fs::File::open(filename).expect("Can't open file");
+    let lines: Vec<String> = io::BufReader::new(file)
+        .by_ref()
+        .lines()
+        .flatten()
+        .collect();
+
+    println!("PART ONE ---------------");
+    part1(&lines);
+    println!("\n PART TWO ---------------");
+    part2(&lines);
+}
+
+use parsing::{line, Line, Command, Listing};
+use path_clean::clean;
+
+#[derive(Debug)]
+struct State {
+    cur_path: PathBuf,
+    filesystem: HashMap<String, usize>,
+}
+
+impl State {
+    fn new() -> Self {
+        State { cur_path: PathBuf::from("/"), filesystem: HashMap::new() }
+    }
+
+    fn process(&mut self, line: Line) {
+        match line {
+            Line::Command(cmd) => self.run(cmd),
+            Line::Result(listing) => self.process_result(listing),
+        }
+    }
+
+    fn run(&mut self, cmd: Command) {
+        match cmd {
+            Command::Ls => {},
+            Command::Cd(p) => self.cur_path.push(p),
+        }
+    }
+
+    fn process_result(&mut self, res: Listing) {
+        let filename = clean(&self.cur_path.join(res.path()).to_string_lossy());
+        if let Listing::File(_, size) = res {
+            self.filesystem.insert(filename, size);
+        }
+    }
+}
+
+fn part1(lines: &[String]) {
+    let mut state = State::new();
+
+    lines
+        .iter()
+        .flat_map(|l| line(l))
+        .for_each(|(_, l)| state.process(l));
+
+    dbg!(state.filesystem);
+}
+
+fn part2(lines: &[String]) {}