Auto-resolve prefixes to the latest version (#2487)

libexec/pyenv-latest

@@ -0,0 +1,78 @@
+#!/usr/bin/env bash
+# Summary: Print the latest installed or known version with the given prefix
+# Usage: pyenv latest [-k|--known] [-q|--quiet] <prefix>
+#
+#   -k/--known      Select from all known versions instead of installed
+#   -q/--quiet      Do not print a 
+
+set -e
+[ -n "$PYENV_DEBUG" ] && set -x
+
+while [[ $# -gt 0 ]]
+do
+    case "$1" in
+        -k|--known)
+            FROM_KNOWN=1
+            shift
+            ;;
+        -q|--quiet)
+            QUIET=1
+            shift
+            ;;
+        *)
+            break
+            ;;
+    esac
+done
+
+prefix=$1
+exitcode=0
+
+IFS=$'\n'
+
+    if [[ -z $FROM_KNOWN ]]; then
+        DEFINITION_CANDIDATES=( $(pyenv-versions --bare) )
+    else
+        DEFINITION_CANDIDATES=( $(python-build --definitions ) )
+    fi
+    # if grep -xFe "$prefix" <<<"${DEFINITION_CANDIDATES[@]}"; then
+        # echo "$prefix"
+        # exit $exitcode
+    # fi
+    # https://stackoverflow.com/questions/11856054/is-there-an-easy-way-to-pass-a-raw-string-to-grep/63483807#63483807 
+    prefix_re="$(sed 's/[^\^]/[&]/g;s/[\^]/\\&/g' <<< "$prefix")"
+    # 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[-.]" || true))
+
+    DEFINITION_CANDIDATES=(\
+        $(printf '%s\n' "${DEFINITION_CANDIDATES[@]}" | \
+          sed -E -e '/-dev$/d' -e '/-src$/d' -e '/-latest$/d' -e '/(b|rc)[0-9]+$/d'));
+
+    # 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 $QUIET ]]; then
+            echo "pyenv: no $([[ -z $FROM_KNOWN ]] && echo installed || echo known) versions match the prefix \`$prefix'" >&2
+        fi
+        exitcode=1
+    fi
+
+exit $exitcode

libexec/pyenv-prefix

@@ -42,6 +42,7 @@ OLDIFS="$IFS"
         exit 1
       fi
     else
+      version="$(pyenv-latest -q "$version" || echo "$version")"
       PYENV_PREFIX_PATH="${PYENV_ROOT}/versions/${version}"
     fi
     if [ -d "$PYENV_PREFIX_PATH" ]; then

libexec/pyenv-version-name

@@ -34,6 +34,8 @@ OLDIFS="$IFS"
       versions=("${versions[@]}" "${version}")
     elif version_exists "${version#python-}"; then
       versions=("${versions[@]}" "${version#python-}")
+    elif resolved_version="$(pyenv-latest -q "$version")"; then
+      versions=("${versions[@]}" "${resolved_version}")
     else
       echo "pyenv: version \`$version' is not installed (set by $(pyenv-version-origin))" >&2
       any_not_installed=1