Merge pull request #3 from tpoindex/master

Fix tup/tupx plus a few additions: safe nested tuples, maybe monad, filter predicates.

src/fun.sh

@@ -8,11 +8,11 @@ take() {
   command head -n ${1}
 }
 
-tail() {
+ltail() {
   drop 1
 }
 
-head() {
+lhead() {
   take 1
 }
 
@@ -262,7 +262,7 @@ tup() {
     read arg
     tup $arg
   else
-    list "$@" | map lambda x . 'echo ${x/,/u002c}' | join , '(' ')'
+    list "$@" | map lambda x . 'echo ${x//,/u002c}' | join , '(' ')'
   fi
 }
 
@@ -274,7 +274,7 @@ tupx() {
   else
     local n=$1
     shift
-    echo "$@" | stripl '(' | stripr ')' | cut -d',' -f${n} | tr ',' '\n' | map lambda x . 'echo ${x/u002c/,}'
+    echo "$@" | stripl '(' | stripr ')' | cut -d',' -f${n} | tr ',' '\n' | map lambda x . 'echo ${x//u002c/,}'
   fi
 }
 
@@ -286,7 +286,37 @@ tupr() {
   tupx 1- "$@" | last
 }
 
-zip() {
+ntup() {
+  if [[ $# -eq 0 ]]; then
+    local arg
+    read arg
+    ntup $arg
+  else
+    list "$@" | map lambda x . 'echo "$x" | base64 --wrap=0 ; echo' | join , '(' ')'
+  fi
+}
+
+ntupx() {
+  if [[ $# -eq 1 ]]; then
+    local arg
+    read arg
+    ntupx "$1" "$arg"
+  else
+    local n=$1
+    shift
+    echo "$@" | stripl '(' | stripr ')' | cut -d',' -f${n} | tr , '\n' | map lambda x . 'echo "$x" | base64 -d'
+  fi
+}
+
+ntupl() {
+  ntupx 1 "$@"
+}
+
+ntupr() {
+  ntupx 1- "$@" | last
+}
+
+lzip() {
   local list=$*
   cat - | while read x; do
     y=$(list $list | take 1)
@@ -328,3 +358,80 @@ call() {
     local args=$@
     tup $f $args
 }
+
+maybe() {
+  if [[ $# -eq 0 ]]; then
+    local arg
+    read arg
+    maybe "$arg"
+  else
+    local x="$*"
+    local value=$(echo $x | strip)
+    if [[ ${#value} -eq 0 ]]; then
+      tup Nothing
+    else
+      tup Just "$value"
+    fi
+  fi
+}
+
+maybemap() {
+  local x
+  read x
+  if [[ $(tupl $x) = "Nothing" ]]; then
+    echo $x
+  else
+    local y=$(tupr "$x")
+    local r=$(echo "$y" | map "$@")
+    maybe "$r"
+  fi
+}
+
+maybevalue() {
+  local default="$*"
+  local x
+  read x
+  if [[ $(tupl $x) = "Nothing" ]]; then
+      echo "$default"
+  else
+      echo $(tupr $x)
+  fi
+}
+
+
+# commonly used predicates for filter
+# e.g.  list 1 a 2 b 3 c | filter lambda x . 'isint $x'
+
+# inverse another test, e.g. "not isint $x"
+not() {
+  local r=$("$@" 2>/dev/null)
+  $r && ret false || ret true
+}
+
+isint() {
+  [ "$1" -eq "$1" ] 2>/dev/null && ret true || ret false
+}
+
+isempty() {
+  [ -z "$1" ] && ret true || ret false
+}
+
+isfile() {
+  [ -f "$1" ] && ret true || ret false
+}
+
+isnonzerofile() {
+  [ -s "$1" ] && ret true || ret false
+}
+
+isreadable() {
+  [ -r "$1" ] && ret true || ret false
+}
+
+iswritable() {
+  [ -w "$1" ] && ret true || ret false
+}
+
+isdir() {
+  [ -d "$1" ] && ret true || ret false
+}

test/head_test.sh

@@ -1,16 +1,16 @@
 #! /bin/bash
 
-testHeadFromList() {
-  assertEquals 1 $(list {1..10} | head)
-  assertEquals 5 $(list 5 6 7 | head)
+testLHeadFromList() {
+  assertEquals 1 $(list {1..10} | lhead)
+  assertEquals 5 $(list 5 6 7 | lhead)
 }
 
-testHeadFromOneElementList() {
-  assertEquals 1 $(list 1 | head)
+testLHeadFromOneElementList() {
+  assertEquals 1 $(list 1 | lhead)
 }
 
-testHeadFromEmptyList() {
-  assertEquals "" "$(list | head)"
+testLHeadFromEmptyList() {
+  assertEquals "" "$(list | lhead)"
 }
 
 . ./shunit2-init.sh

test/maybe_test.sh

@@ -0,0 +1,29 @@
+#! /bin/bash
+
+testMaybe() {
+  assertEquals '(Just,1)' "$(maybe 1)"
+  assertEquals '(Just,1)' "$(echo 1 | maybe)"
+  assertEquals '(Nothing)' "$(maybe '')"
+  assertEquals '(Nothing)' "$(maybe '    ')"
+  assertEquals '(Nothing)' "$(maybe '    ' '  ' '   ')"
+  assertEquals '(Nothing)' "$(echo | maybe)"
+  assertEquals '(Just,1 2 3)' "$(maybe 1 2 3)"
+  assertEquals '(Just,1 2 3)' "$(echo 1 2 3 | maybe)"
+}
+
+testMaybemap() {
+  assertEquals '(Just,3)'  "$(echo 1 | maybe | maybemap lambda a . 'echo $(( a + 1 ))' | maybemap lambda a . 'echo $(( a + 1 ))')"
+  assertEquals '(Nothing)' "$(echo   | maybe | maybemap lambda a . 'echo $(( a + 1 ))' | maybemap lambda a . 'echo $(( a + 1 ))')"
+
+  assertEquals '(Nothing)'  "$(echo 1 | maybe | maybemap lambda a . 'echo $(( a + 1 ))' | maybemap lambda a . 'echo')"
+  assertEquals '(Nothing)'  "$(echo 1 | maybe | maybemap lambda a . 'echo $(( a + 1 ))' | maybemap lambda a . 'echo' | maybemap lambda a . 'echo $(( a + 1 ))')"
+}
+
+testMaybevalue() {
+  assertEquals 3 "$(echo 1 | maybe | maybemap lambda a . 'echo $(( a + 1 ))' | maybemap lambda a . 'echo $(( a + 1 ))' | maybevalue 0)"
+  assertEquals 0 "$(echo   | maybe | maybemap lambda a . 'echo $(( a + 1 ))' | maybemap lambda a . 'echo $(( a + 1 ))' | maybevalue 0)"
+  assertEquals 'a b c' "$(echo   | maybe | maybemap lambda a . 'echo $(( a + 1 ))' | maybemap lambda a . 'echo $(( a + 1 ))' | maybevalue a b c)"
+}
+
+
+. ./shunit2-init.sh

test/predicates_test.sh

@@ -0,0 +1,52 @@
+#! /bin/bash
+
+testIsint() {
+  assertEquals 'true' $(isint 1)
+  assertEquals 'true' $(isint -1)
+  assertEquals 'false' $(isint a)
+  assertEquals 'false' $(isint "")
+  assertEquals '1 2 3 4 5' "$(list 1 a 2 b 3 c 4 d 5 e | filter lambda x . 'isint $x' | unlist )"
+  assertEquals '1 2'       "$(list 1 a 2 b 3 c 4 d 5 e | filter lambda x . '($(isint $x) &&  [[ $x -le 2 ]] && ret true) || ret false ' | unlist )"
+
+  assertEquals 'false' $(not isint 1)
+  assertEquals 'true' $(not isint a)
+}
+
+testIsempty() {
+  assertEquals 'true' $(isempty "")
+  assertEquals 'false' $(isempty a)
+
+  assertEquals 'true' $(not isempty a)
+  assertEquals 'false' $(not isempty "")
+}
+
+testIsfile() {
+  f=$(mktemp)
+
+  assertEquals 'true' $(isfile $f)
+  assertEquals 'false' $(isfile $f.xxx)
+  assertEquals 'false' $(isfile "")
+  assertEquals 'true' $(not isfile $f.xxx)
+
+  assertEquals 'false' $(isnonzerofile $f)
+  echo hello world >$f
+  assertEquals 'true' $(isnonzerofile $f)
+
+  assertEquals 'true' $(iswritable $f)
+  chmod 400 $f
+  assertEquals 'false' $(iswritable $f)
+
+  assertEquals 'true' $(isreadable $f)
+  chmod 200 $f
+  assertEquals 'false' $(isreadable $f)
+
+  chmod 600 $f
+  rm $f
+}
+
+testIsdir() {
+  assertEquals 'true' $(isdir .)
+  assertEquals 'false' $(isdir sir_not_appearing_in_this_film)
+}
+
+. ./shunit2-init.sh

test/tail_test.sh

@@ -1,15 +1,15 @@
 #! /bin/bash
 
-testTailFrom10() {
-  assertEquals "2 3 4 5 6 7 8 9 10" "$(list {1..10} | tail | unlist)"
+testLTailFrom10() {
+  assertEquals "2 3 4 5 6 7 8 9 10" "$(list {1..10} | ltail | unlist)"
 }
 
-testTailFromOneElementList() {
-  assertEquals "" "$(list 1 | tail)"
+testLTailFromOneElementList() {
+  assertEquals "" "$(list 1 | ltail)"
 }
 
-testTailFromEmptyList() {
-  assertEquals "" "$(list | tail)"
+testLTailFromEmptyList() {
+  assertEquals "" "$(list | ltail)"
 }
 
 . ./shunit2-init.sh

test/tup_test.sh

@@ -9,6 +9,7 @@ testTupIfOneElement() {
   assertEquals '(")' $(tup '"')
   assertEquals "(')" $(tup "'")
   assertEquals "(u002c)" $(tup ",")
+  assertEquals "(u002cu002c)" $(tup ",,")
   assertEquals "(()" $(tup "(")
   assertEquals "())" $(tup ")")
 }
@@ -38,6 +39,7 @@ testTupxIfZeroIndex() {
 
 testTupxIfSpecialChars() {
   assertEquals ',' "$(tup ',' | tupx 1)"
+  assertEquals ',,' "$(tup ',,' | tupx 1)"
   assertEquals '(' "$(tup '(' | tupx 1)"
   assertEquals ')' "$(tup ')' | tupx 1)"
   assertEquals '()' "$(tup '()' | tupx 1)"
@@ -45,6 +47,7 @@ testTupxIfSpecialChars() {
   assertEquals '(' "$(tup '(' '(' | tupx 1)"
   assertEquals ')' "$(tup ')' ')' | tupx 1)"
   assertEquals ',' "$(tup 'u002c' | tupx 1)"
+  assertEquals ',,' "$(tup 'u002cu002c' | tupx 1)"
 }
 
 testTupxRange() {
@@ -66,4 +69,16 @@ testTupr() {
   assertEquals '5' "$(tup 5 | tupr)"
 }
 
+testNTup() {
+  assertEquals '(KFlRbz0sWWdvPSkK,Ywo=)' "$(ntup $(ntup a b) c)"
+  assertEquals '(YQo=,Ygo=)' "$(ntupl '(KFlRbz0sWWdvPSkK,Ywo=)')"
+  assertEquals 'a' "$(ntupl '(YQo=,Ygo=)')"
+  assertEquals 'b' "$(ntupr '(YQo=,Ygo=)')"
+  assertEquals 'c' "$(ntupr '(KFlRbz0sWWdvPSkK,Ywo=)')"
+  assertEquals 'a' "$(ntup $(ntup a b) c | ntupx 1 | ntupx 1)"
+  assertEquals 'b' "$(ntup $(ntup a b) c | ntupx 1 | ntupx 2)"
+  assertEquals 'c' "$(ntup $(ntup a b) c | ntupx 2)"
+  assertEquals 'a b' "$(ntup $(ntup a b) c | ntupx 1 | ntupx 1,2 | unlist)"
+}
+
 . ./shunit2-init.sh