pyenv verification source

libexec/pyenv-latest

@@ -0,0 +1,105 @@
+#!/usr/bin/env bash
+# Summary: Print the latest installed or known version with the given prefix
+# Usage: pyenv latest [-k|--known] <prefix>
+#
+#   -k/--known      Select from all known versions instead of installed
+#   -b/--bypass     (internal) On a resolution failure, do not print an error message
+#                   but rather print the argument unchanged
+#   -f/--force      (internal) Same as -b but also do not return a failure exit code
+
+set -e
+[ -n "$PYENV_DEBUG" ] && set -x
+
+
+while [[ $# -gt 0 ]]
+do
+    case "$1" in
+        -k|--known)
+            FROM_KNOWN=1
+            shift
+            ;;
+        -b|--bypass)
+            BYPASS=1
+            shift
+            ;;
+        -f|--force)
+            FORCE=1
+            BYPASS=1
+            shift
+            ;;
+        *)
+            break
+            ;;
+    esac
+done
+
+prefix=$1
+exitcode=0
+
+IFS=$'\n'
+
+    if [[ -z $FROM_KNOWN ]]; then
+        if [[ -d $PYENV_ROOT/versions/$prefix ]]; then
+            echo "$prefix"
+            exit $exitcode;
+        fi
+        DEFINITION_CANDIDATES=( $(pyenv-versions --bare --skip-envs) )
+    else
+        DEFINITION_CANDIDATES=( $(python-build --definitions ) )
+    fi
+    
+    if printf '%s\n' "${DEFINITION_CANDIDATES[@]}" 2>/dev/null | grep -qxFe "$prefix"; then
+        echo "$prefix"
+        exit $exitcode;
+    fi
+    
+    suffix=""
+    if [[ $prefix =~ ^(.*[0-9])t$ ]]; then
+        suffix="t"
+        prefix="${BASH_REMATCH[1]}"
+    fi
+    
+    # https://stackoverflow.com/questions/11856054/is-there-an-easy-way-to-pass-a-raw-string-to-grep/63483807#63483807 
+    prefix_re="$(sed 's/[^\^]/[&]/g;s/[\^]/\\&/g' <<< "$prefix")"
+    suffix_re="$(sed 's/[^\^]/[&]/g;s/[\^]/\\&/g' <<< "$suffix")"
+    # FIXME: more reliable and readable would probably be to loop over them and transform in pure Bash
+    DEFINITION_CANDIDATES=(\
+      $(printf '%s\n' "${DEFINITION_CANDIDATES[@]}" | \
+      grep -Ee "^$prefix_re[-.].*$suffix_re\$" || true))
+
+    DEFINITION_CANDIDATES=(\
+        $(printf '%s\n' "${DEFINITION_CANDIDATES[@]}" | \
+          sed -E -e '/-dev$/d' -e '/-src$/d' -e '/-latest$/d' -e '/(a|b|rc)[0-9]+$/d' \
+            $(if [[ -z $suffix ]]; then echo "-e /[0-9]t\$/d"; fi)
+        ));
+
+    # Compose a sorting key, followed by | and original value
+    DEFINITION_CANDIDATES=(\
+        $(printf '%s\n' "${DEFINITION_CANDIDATES[@]}" | \
+          awk \
+            '{ if (match($0,"^[[:alnum:]]+-"))
+               { print substr($0,0,RLENGTH-1) "." substr($0,RLENGTH+1) "..|" $0; }
+             else
+               { print $0 "...|" $0; }
+             }'))
+    DEFINITION_CANDIDATES=(\
+        $(printf '%s\n' "${DEFINITION_CANDIDATES[@]}" \
+          | sort -t. -k1,1r -k 2,2nr -k 3,3nr -k4,4nr \
+          | cut -f2 -d $'|' \
+        || true))
+    DEFINITION="${DEFINITION_CANDIDATES[0]}"
+
+    if [[ -n "$DEFINITION" ]]; then
+        echo "$DEFINITION"
+    else
+        if [[ -z $BYPASS ]]; then
+            echo "pyenv: no $([[ -z $FROM_KNOWN ]] && echo installed || echo known) versions match the prefix \`$prefix'" >&2
+        else
+            echo "$prefix"
+        fi
+        if [[ -z $FORCE ]]; then
+            exitcode=1
+        fi
+    fi
+
+exit $exitcode