mypath.lua

Sun, 06 Aug 2023 14:32:25 +0300

author
Tuomo Valkonen <tuomov@iki.fi>
date
Sun, 06 Aug 2023 14:32:25 +0300
changeset 42
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parent 35
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permissions
-rw-r--r--

Preliminary breadcrumb support

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1
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2 --@module path
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3 local path={}
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4
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5 local tuple=require("tuple")
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6 local lfs=require("lfs")
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7 local err=require("err")
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8 local config=require("config")
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10 local sep=config.dirsep
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11
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12 function path.join(p, f)
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13 if p=="" then
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14 return f
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15 else
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16 return p..sep..f
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17 end
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18 end
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20 function path.dirbasename(p)
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21 local d, b = string.match(p,
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22 "^(.*)"..sep.."+([^"..sep.."]+)"..sep.."*$")
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23 if not b then
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24 return "", p
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25 else
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26 return d, b
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27 end
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28 end
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29
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30 function path.dirname(p)
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31 return tuple.fst(path.dirbasename(p))
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32 end
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33
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34 function path.dirname_slash(p)
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35 local dn=dirname(p)
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36 if dn=="" then
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37 return dn
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38 else
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39 return dn..sep
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40 end
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41 end
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43 function path.basename(p)
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44 return tuple.snd(dirbasename(p))
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45 end
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47 function path.rmext(p)
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48 return string.gsub(p, "%.[^.]*$", "")
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49 end
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50
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51 -- would rather do this as an iterator, but can't
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52 -- coroutine.yield from gsub handler
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53 function path.split(p)
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54 local t={}
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55 local head=""
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56 local s, p2 = string.match(p, "^("..sep.."+)(.*)$")
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57 if s then
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58 table.insert(t, "/.") -- root
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59 p=p2
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60 end
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61 string.gsub(p, "([^"..sep.."]+)", --..sep.."+",
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62 function(d) table.insert(t, d); end)
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63 return t
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64 end
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65
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66 --[[
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67 function path.parts(p)
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68 local s={i=1, t=split(p)}
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69 local function g(s)
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70 local v=s.t[s.i]
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71 s.i=s.i+1
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72 return v
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73 end
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74 return g, s
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75 end
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76
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77 function path.makepath(p, head)
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78 head=head or ""
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79 for d in parts(p) do
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80 head=head..d
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81 local a=lfs.attributes(head)
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82 if not a then
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83 local success, e = lfs.mkdir(head)
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84 if not success then
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85 err.file(head, e)
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86 end
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87 elseif a.mode~="directory" then
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88 err.file(head, "not a directory")
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89 end
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90 head=head..sep
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91 end
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92 end
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93 ]]
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94
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95 function path.simplify(p)
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96 local capts={}
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97 local start=string.match(p, "^(/)")
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98 string.gsub(p, "([^/]+)",
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99 function(e)
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100 if e==".." and #capts > 1 then
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101 capts[#capts]=nil
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102 elseif e~="." then
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103 table.insert(capts, e)
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104 end
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105 end)
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106 return (start or "")..table.concat(capts, "/")
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107 end
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108
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109 function path.to_root(p)
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110 return string.rep("../",#(path.split(p))-1)
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111 end
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113 return path

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