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punkshell/src/bootsupport/modules/punk/path-0.1.0.tm

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# -*- tcl -*-
# Maintenance Instruction: leave the 999999.xxx.x as is and use 'pmix make' or src/make.tcl to update from <pkg>-buildversion.txt
#
# Please consider using a BSD or MIT style license for greatest compatibility with the Tcl ecosystem.
# Code using preferred Tcl licenses can be eligible for inclusion in Tcllib, Tklib and the punk package repository.
# ++ +++ +++ +++ +++ +++ +++ +++ +++ +++ +++
# (C) 2023
#
# @@ Meta Begin
# Application punk::path 0.1.0
# Meta platform tcl
# Meta license <unspecified>
# @@ Meta End
# ++ +++ +++ +++ +++ +++ +++ +++ +++ +++ +++
# doctools header
# ++ +++ +++ +++ +++ +++ +++ +++ +++ +++ +++
#*** !doctools
#[manpage_begin punkshell_module_punk::path 0 0.1.0]
#[copyright "2023"]
#[titledesc {Filesystem path utilities}] [comment {-- Name section and table of contents description --}]
#[moddesc {punk path filesystem utils}] [comment {-- Description at end of page heading --}]
#[require punk::path]
#[description]
#[keywords module path filesystem]
# ++ +++ +++ +++ +++ +++ +++ +++ +++ +++ +++
#*** !doctools
#[section Overview]
#[para] overview of punk::path
#[para] Filesystem path utility functions
#[subsection Concepts]
#[para] -
# ++ +++ +++ +++ +++ +++ +++ +++ +++ +++ +++
## Requirements
# ++ +++ +++ +++ +++ +++ +++ +++ +++ +++ +++
#*** !doctools
#[subsection dependencies]
#[para] packages used by punk::path
#[list_begin itemized]
package require Tcl 8.6
#*** !doctools
#[item] [package {Tcl 8.6}]
# #package require frobz
# #*** !doctools
# #[item] [package {frobz}]
#*** !doctools
#[list_end]
# ++ +++ +++ +++ +++ +++ +++ +++ +++ +++ +++
#*** !doctools
#[section API]
# ++ +++ +++ +++ +++ +++ +++ +++ +++ +++ +++
# oo::class namespace
# ++ +++ +++ +++ +++ +++ +++ +++ +++ +++ +++
namespace eval punk::path::class {
#*** !doctools
#[subsection {Namespace punk::path::class}]
#[para] class definitions
if {[info commands [namespace current]::interface_sample1] eq ""} {
#*** !doctools
#[list_begin enumerated]
# oo::class create interface_sample1 {
# #*** !doctools
# #[enum] CLASS [class interface_sample1]
# #[list_begin definitions]
# method test {arg1} {
# #*** !doctools
# #[call class::interface_sample1 [method test] [arg arg1]]
# #[para] test method
# puts "test: $arg1"
# }
# #*** !doctools
# #[list_end] [comment {-- end definitions interface_sample1}]
# }
#*** !doctools
#[list_end] [comment {--- end class enumeration ---}]
}
}
# ++ +++ +++ +++ +++ +++ +++ +++ +++ +++ +++
# ++ +++ +++ +++ +++ +++ +++ +++ +++ +++ +++
# Base namespace
# ++ +++ +++ +++ +++ +++ +++ +++ +++ +++ +++
namespace eval punk::path {
namespace export *
#variable xyz
#*** !doctools
#[subsection {Namespace punk::path}]
#[para] Core API functions for punk::path
#[list_begin definitions]
proc pathglob_as_re {pathglob} {
#*** !doctools
#[call [fun pathglob_as_re] [arg pathglob]]
#[para] Returns a regular expression for matching a path to a glob pattern which can contain glob chars *|? in any segment of the path structure
#[para] ** matches any number of subdirectories.
#[para] e.g /etc/**/*.txt will match any .txt files at any depth below /etc (except directly within /etc itself)
#[para] e.g /etc/**.txt will match any .txt files at any depth below /etc
#[para] any segment that does not contain ** must match exactly one segment in the path
#[para] e.g the glob /etc/*/*.doc - will match any .doc files that are exactly one tree level below /etc
#[para] The pathglob doesn't have to contain glob characters, in which case the returned regex will match the pathglob exactly as specified.
#[para] Regular expression syntax is deliberateley not supported within the pathglob string so that supplied regex characters will be treated as literals
#todo - consider whether a way to escape the glob chars ? * is practical - to allow literals ? *
# - would require counting immediately-preceding backslashes
set pats [list]
foreach seg [file split $pathglob] {
if {[string range $seg end end] eq "/"} {
set seg [string range $seg 0 end-1] ;# e.g c:/ -> c: / -> "" so that join at end doesn't double up
}
if {$seg eq "*"} {
lappend pats {[^/]*}
} elseif {$seg eq "**"} {
lappend pats {.*}
} else {
set seg [string map [list {^ {\^} $ {\$} [} {\[} ( {\(} \{ \\\{ \\ {\\}] $seg] ;#treat regex characters in the input as literals
set seg [string map [list . {[.]}] $seg]
if {[regexp {[*?]} $seg]} {
set pat [string map [list ** {.*} * {[^/]*} ? {[^/]}] $seg]
lappend pats "$pat"
} else {
lappend pats "$seg"
}
}
}
return "^[join $pats /]\$"
}
proc globmatchpath {pathglob path args} {
#*** !doctools
#[call [fun globmatchpath] [arg pathglob] [arg path] [opt {option value...}]]
#[para] Return true if the pathglob matches the path
#[para] see [fun pathglob_as_re] for pathglob description
#[para] Caller must ensure that file separator is forward slash. (e.g use file normalize on windows)
#[para]
#[para] Known options:
#[para] -nocase 0|1 (default 0 - case sensitive)
#[para] If -nocase is not supplied - default to case sensitive *except for driveletter*
#[para] ie - the driveletter alone in paths such as c:/etc will still be case insensitive. (ie c:/ETC/* will match C:/ETC/blah but not C:/etc/blah)
#[para] Explicitly specifying -nocase 0 will require the entire case to match including the driveletter.
set defaults [dict create\
-nocase \uFFFF\
]
set known_opts [dict keys $defaults]
set opts [dict merge $defaults $args]
dict for {k v} $args {
if {$k ni $known_opts} {
error "Unrecognised options $k - known options: $known_opts"
}
}
# -- --- --- --- --- ---
set opt_nocase [dict get $opts -nocase]
set explicit_nocase 1 ;#default to disprove
if {$opt_nocase eq "\uFFFF"} {
set opt_nocase 0
set explicit_nocase 0
}
# -- --- --- --- --- ---
if {$opt_nocase} {
return [regexp -nocase [pathglob_as_re $pathglob] $path]
} else {
set re [pathglob_as_re $pathglob]
if {$explicit_nocase} {
set ismatch [regexp $re $path] ;#explicit -nocase 0 - require exact match of path literals including driveletter
} else {
#caller is using default for -nocase - which indicates case sensitivity - but we have an exception for the driveletter.
set re_segments [file split $re] ;#Note that file split c:/etc gives {c:/ etc} but file split ^c:/etc gives {^c: etc}
set first_seg [lindex $re_segments 0]
if {[regexp {^\^(.{1}):$} $first_seg _match driveletter]} {
#first part of re is like "^c:" i.e a drive letter
set chars [string tolower $driveletter][string toupper $driveletter]
set re [join [concat "^\[$chars\]:" [lrange $re_segments 1 end]] /] ;#rebuild re with case insensitive driveletter only - use join - not file join. file join will misinterpret leading re segment.
}
#puts stderr "-->re: $re"
set ismatch [regexp $re $path]
}
}
return $ismatch
}
#todo - implement treefiles which acts like dirfiles but allows path globbing in the same way as punk::ns::ns/
#then review if treefiles can replace dirfiles or if both should exist (dirfiles can have literal glob chars in path segments - but that is a rare usecase)
proc treefilenames {basepath tailglob args} {
#*** !doctools
#[call [fun treefilenames] [arg basepath] [arg tailglob] [opt {option value...}]]
#basic (glob based) list of filenames matching tailglob - recursive
#no natsorting - so order is dependent on filesystem
set defaults [dict create\
-call-depth-internal 0\
-antiglob_paths {}\
]
set opts [dict merge $defaults $args]
set opt_antiglob_paths [dict get $opts -antiglob_paths]
set CALLDEPTH [dict get $opts -call-depth-internal]
set files [list]
if {$CALLDEPTH == 0} {
if {![file isdirectory $basepath]} {
return [list]
}
}
set skip 0
foreach anti $opt_antiglob_paths {
if {[globmatchpath $anti $basepath]} {
set skip 1
break
}
}
if {$skip} {
return [list]
}
#todo - account for vfs where matched path could appear to be a directory but is mounted so could be a desired match?
set dirfiles [glob -nocomplain -dir $basepath -type f $tailglob]
lappend files {*}$dirfiles
set dirdirs [glob -nocomplain -dir $basepath -type d *]
foreach dir $dirdirs {
set skip 0
foreach anti $opt_antiglob_paths {
if {[globmatchpath $anti $dir]} {
set skip 1
break
}
}
if {$skip} {
continue
}
set nextargs [dict merge $args [list -call-depth-internal [incr CALLDEPTH]]]
lappend files {*}[treefilenames $dir $tailglob {*}$nextargs]
}
return $files
}
#maint warning - also in punkcheck
proc relative {reference location} {
#*** !doctools
#[call [fun relative] [arg reference] [arg location]]
#[para] Taking two directory paths, a reference and a location, computes the path
# of the location relative to the reference.
#[list_begin itemized]
#[item]
#[para] Arguments:
# [list_begin arguments]
# [arg_def string reference] The path from which the relative path to location is determined.
# [arg_def string location] The location path which may be above or below the reference path
# [list_end]
#[item]
#[para] Results:
#[para] The relative path of the location to the reference path.
#[para] Will return a single dot "." if the paths are the same
#[item]
#[para] Notes:
#[para] Both paths must be the same type - ie both absolute or both relative
#[para] Case sensitive. ie relative /etc /etC
# will return ../etC
#[para] On windows, the drive-letter component (only) is not case sensitive
#[para] ie relative c:/etc C:/etc returns .
#[para] but relative c:/etc C:/Etc returns ../Etc
#[para] On windows, if the paths are absolute and specifiy different volumes, only the location will be returned.
# ie relative c:/etc d:/etc/blah
# returns d:/etc/blah
#[list_end]
#see also kettle
# Modified copy of ::fileutil::relative (tcllib)
# Adapted to 8.5 ({*}).
#review - check volume info on windows.. UNC paths?
if {[file pathtype $reference] ne [file pathtype $location]} {
return -code error "Unable to compute relation for paths of different pathtypes: [file pathtype $reference] vs. [file pathtype $location], ($reference vs. $location)"
}
#avoid normalizing if possible (file normalize *very* expensive on windows)
set do_normalize 0
if {[file pathtype $reference] eq "relative"} {
#if reference is relative so is location
if {[regexp {[.]{2}} [list $reference $location]]} {
set do_normalize 1
}
if {[regexp {[.]/} [list $reference $location]]} {
set do_normalize 1
}
} else {
set do_normalize 1
}
if {$do_normalize} {
set reference [file normalize $reference]
set location [file normalize $location]
}
set save $location
set reference [file split $reference]
set location [file split $location]
while {[lindex $location 0] eq [lindex $reference 0]} {
set location [lrange $location 1 end]
set reference [lrange $reference 1 end]
if {![llength $location]} {break}
}
set location_len [llength $location]
set reference_len [llength $reference]
if {($location_len == 0) && ($reference_len == 0)} {
# Cases:
# (a) reference == location
set location .
} else {
# Cases:
# (b) ref is: ref/sub = sub
# loc is: ref = {}
# (c) ref is: ref = {}
# loc is: ref/sub = sub
while {$reference_len > 0} {
set location [linsert $location 0 ..]
incr reference_len -1
}
set location [file join {*}$location]
}
return $location
}
#*** !doctools
#[list_end] [comment {--- end definitions namespace punk::path ---}]
}
# ++ +++ +++ +++ +++ +++ +++ +++ +++ +++ +++
# ++ +++ +++ +++ +++ +++ +++ +++ +++ +++ +++
# Secondary API namespace
# ++ +++ +++ +++ +++ +++ +++ +++ +++ +++ +++
namespace eval punk::path::lib {
namespace export *
namespace path [namespace parent]
#*** !doctools
#[subsection {Namespace punk::path::lib}]
#[para] Secondary functions that are part of the API
#[list_begin definitions]
#*** !doctools
#[list_end] [comment {--- end definitions namespace punk::path::lib ---}]
}
# ++ +++ +++ +++ +++ +++ +++ +++ +++ +++ +++
# ++ +++ +++ +++ +++ +++ +++ +++ +++ +++ +++
#*** !doctools
#[section Internal]
namespace eval punk::path::system {
#*** !doctools
#[subsection {Namespace punk::path::system}]
#[para] Internal functions that are not part of the API
}
# ++ +++ +++ +++ +++ +++ +++ +++ +++ +++ +++
## Ready
package provide punk::path [namespace eval punk::path {
variable pkg punk::path
variable version
set version 0.1.0
}]
return
#*** !doctools
#[manpage_end]